Currently browsing: Items authored or edited by Colin Walker

238 items in this list.
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Burston, Colin; Martin, Ralph and Walker, Colin (1997). Obetia ficifolia - a pachycaul stinging nettle. British Cactus & Succulent Journal, 15(1) pp. 2–6.

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Crook, Ivor; Pearcy, Les and Walker, Colin C. (2020). Contrasting growth habits of some arid-loving southern African aloes. Haworthiad, 34(3) pp. 65–68.

Carter, S.; Lavranos, J. J.; Newton, L. E. and Walker, C. C. (2011). Aloes – The definitive guide. London: Kew Publishing in association with the British Cactus and Succulent Society.

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Forster, P. I.; Guymer, G. P. and Walker, C. C. (2023). Brachychiton MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 821–825.

Forster, P. I.; Guymer, G. P.; Van Jaarsveld, E. J. and Walker, C. C. (2023). Sterculia MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 853–858.

Forster, P.I.; Guymer, G.P.; Van Jaarsveld, E.J. and Walker, C.C. (2022). Sterculia MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants, 2nd ed. Cham: Springer.

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Jonkers, Bert and Walker, Colin C. (1993). The Asclepiads of Morocco - a short commentary. Asklepios(59) pp. 14–21.

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Prendergast, Hew D.V. and Walker, Colin C. (1992). The argan - multipurpose tree of Morocco. Kew Magazine, 9(2) pp. 76–85.

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Smith, G. F.; Figueiredo, E.; Klopper, R. R.; Crouch, N. R.; Walker, C. C. and Condy, Gillian (2021). Aloiampelos ciliaris var. ciliaris. Asphodelaceae: Alooideae. Flowering Plants of Africa, 67 pp. 18–30.

Smith, G. F.; Figueiredo, E.; Walker, C. C. and Condy, Gillian (2021). Kalanchoe beharensis. Crassulaceae: Kalanchooideae. Flowering Plants of Africa, 67 pp. 50–59.

Smith, G.F.; Walker, Colin and Figueiredo, E. (2011). What's in a name: an update on epithets used in Aloe L. (Asphodelaceae). Bradleya, 29 pp. 179–181.

Smith, Gideon F. and Walker, Colin C. (2001). The botanical paintings of Mary Maud Page. Bradleya, 19 p. 124.

Smith, G.F.; Walker, Colin and Condy, G. (1999). Senecio rowleyanus. Flowering Plants of Africa, 56 116-120, t.2160.

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Walker, Colin C. (2024). Echeveria agavoides and some of its cultivars. Cactus and succulent review(41) pp. 17–21.

Walker, Colin C. (2024). Aloe castilloniae J.-B. Castillon - a highly localised dwarf Madagascan endemic. Haworthiad, 38(2) pp. 48–51.

Walker, Colin (2024). Succulents contained: Huernia thuretii. CactusWorld, 42(2) p. 150.

Walker, Colin (2024). Aloidendron pillansii (L.Guthrie) Klopper & Gideon F.Sm. - a review of a Critically Endangered southern African tree aloe. CactusWorld, 42(2) pp. 89–99.

Walker, Colin (2024). Contrasting cotyledons. Cactus & Succulent Review(40) pp. 25–33.

Walker, Colin C. (2024). [Book review]. Margulies, Jared D. The Cactus Hunters. Desire and Extinction in the Illicit Succulent Trade. CactusWorld, 42(1) pp. 78–79.

Walker, Colin C. (2024). [Book review] Antonelli, A. et al. State of the World's Plants and Fungi 2023. CactusWorld, 42(1) pp. 79–80.

Walker, Colin C. (2024). Succulents contained. Didierea madagascariensis. CactusWorld, 42(1) p. 30.

Walker, Colin C. (2024). Pachyphytum news. CactusWorld, 42(1) pp. 72–74.

Walker, Colin (2024). Aloe secundiflora Engler - a widespread tropical East African species. Haworthiad, 38(1) pp. 8–13.

Walker, Colin (2024). Two first flowering events: Ceropegia dichotoma and Orbea hardyi. New Zealand Cactus & Succulent Journal, 77(1) pp. 16–19.

Walker, Colin C. and Schultz, David M. (2023). William Taylor Marshall: His Contributions to Succulent Plant Study and a Full Bibliography of His Published Work. Haseltonia, 30(1) pp. 27–48.

Walker, Colin (2023). [Book Review] New Literature. Flowering Plants of Africa, Volume 68, June, 2023. CactusWorld, 41(4) p. 339.

Walker, Colin (2023). Succulents contained. Gasteria bicolor var. lilliputana. CactusWorld, 41(4) p. 310.

Walker, Colin (2023). Aloe pendens Forsskal - a cliff-dwelling species from the Yemen. Haworthiad, 37(3) pp. 72–75.

Walker, Colin (2023). Ceropegia armandii : a remarkable dimorphic Madagascan endemic. Cactus & Succulent Review(38) pp. 15–18.

Walker, Colin (2023). Aloe whitcombei Lavranos - a unique and highly localised Omani endemic. Haworthiad, 37(2) pp. 46–48.

Walker, Colin (2023). Mangaves. Cactus & Succulent Review(37) pp. 5–10.

Walker, Colin (2023). Succulents contained: Euphorbia confinalis subsp. confinalis. CactusWorld, 41(2) p. 154.

Walker, Colin (2023). Malvaceae. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 801–806.

Walker, C. C. and Eggli, U. (2023). Adansonia MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 807–820.

Walker, Colin (2023). Cavanillesia MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 827–833.

Walker, Colin (2023). Ceiba MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 835–841.

Walker, Colin (2023). Megistostegium MALVACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Switzerland: Springer Nature, pp. 834–845.

Walker, C. C. and Eggli, U. (2023). Urticaceae. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 1071–1074.

Walker, Colin (2023). Obetia URTICACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 1077–1078.

Walker, Colin (2023). Pilea URTICACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Springer, Cham, pp. 1079–1084.

Walker, Colin (2023). Stapelia hirsuta. Cactus & Succulent Review(36) pp. 15–17.

Walker, Colin (2023). Agave nizandensis - a unique dwarf Mexican species. CactusWorld, 41(1) pp. 51–55.

Walker, Colin (2023). Succulents contained: Haemanthus albiflos. CactusWorld, 41(1) p. 34.

Walker, Colin (2023). Tropical East African aloes: conservation status, uses and threats. CactusWorld, 41(1) pp. 75–76.

Walker, Colin (2023). New literature. Cristini, Marco. The genus Aeonium. CactusWorld, 41(1) pp. 81–82.

Walker, Colin (2023). Aloe fibrosa - a shrubby East African species. Haworthiad, 37(1) pp. 14–16.

Walker, Colin (2023). Sansevierias: an introduction. Cactus and Succulent Journal of NSW, 33(3 & 4) pp. 33–43.

Walker, Colin (2023). Pseudobombax Malvaceae. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Switzerland: Springer Nature, pp. 847–852.

Walker, Colin (2023). Laportea Urticaceae. In: Eggli, Urs and Nyffeler, Reto eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Switzerland: Springer Nature, pp. 1075–1076.

Walker, Colin (2023). Two contrasting stapelias. New Zealand Cactus & Succulent Journal, 76(1) pp. 23–26.

Walker, Colin (2023). Orbea hardyi: A creeping stapeliad endemic to northern South Africa. Cactus and Succulent review(39) pp. 4–6.

Walker, Colin (2022). Euphorbia evolution and taxonomy. CactusWorld, 40(4) pp. 299–300.

Walker, Colin (2022). Madagascan euphorbias. CactusWorld, 40(4) pp. 300–301.

Walker, Colin (2022). Euphorbia susannae is endangered in the wild. CactusWorld, 40(4) p. 301.

Walker, Colin (2022). The history and flowering of Agave xleopoldii. Cactus & Succulent Review(35) pp. 9–12.

Walker, Colin (2022). Succulents contained: Sansevieria subspicata. CactusWorld, 40(4) p. 262.

Walker, Colin (2022). An introduction to Mexican Sedums. New Zealand Cactus & Succulent Journal, 75(2) pp. 28–34.

Walker, Colin (2022). Aloe jucunda - a highly localised, critically endangered Somalian endemic. Haworthiad, 36(2) pp. 61–63.

Walker, Colin (2022). Rhipsalis pilocarpa. A rare and localised Brazilian endemic. Cactus and Succulent Review, 34 pp. 8–10.

Walker, Colin (2022). Stapelia leenderztiae - a uniquely large, tubular-flowered species. CactusWorld, 40(3) pp. 216–218.

Walker, Colin (2022). Aloe palmiformis - an Angolan endemic. CactusWorld, 40(3) pp. 175–178.

Walker, Colin (2022). Chichimecactus: a new genus. CactusWorld, 40(3) p. 227.

Walker, Colin (2022). Succulents contained: Monanthes polyphylla subsp. polyphylla. CactusWorld, 40(3) p. 212.

Walker, Colin (2022). Ceiba MALVACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, Colin (2022). Adansonia MALVACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer, pp. 807–820.

Walker, C.C. (2022). Obetia URTICACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants (SUCCPLANTS). Switzerland: Springer, Cham.

Walker, Colin (2022). Pilea URTICACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, Colin; Forster, P.I.; Guymer, G.P. and van Jaarsveld, E.J. (2022). Brachychiton MALVACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, Colin (2022). Malvaceae. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants (2nd ed.). Cham: Springer.

Walker, C. C. (2022). Laportea URTICACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, Colin (2022). Echeveria cuspidata. Cactus & Succulent Review(33) pp. 10–12.

Walker, Colin (2022). Desmidorchis survives as a conserved name. CactusWorld, 40(2) pp. 147–148.

Walker, Colin (2022). Two recently described spotted-leaved, endemic Kenyan Aloes. Haworthiad, 36(2) pp. 31–33.

Walker, Colin (2022). Succulents contained: Eulychnia acida. CactusWorld, 40(2) p. 104.

Walker, Colin (2022). Megistostegium MALVACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, Colin (2022). Pseudobombax MALVACEAE. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, C. C. (2022). Cavanillesia Malvaceae. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids. Illustrated Handbook of Succulent Plants. Cham: Springer.

Walker, Colin (2022). Palmer's Culture des Cactées - a rare cactus book. Bradleya, 40 pp. 231–248.

Walker, Colin (2022). Succulents contained: Agave montana. CactusWorld, 40(1) p. 71.

Walker, Colin (2022). Cotyledon - a small, highly diverse and complex African genus. CactusWorld, 40(1) pp. 6–15.

Walker, C.C. and Eggli, U. (2022). Urticaceae. In: Eggli, U. and Nyffeler, R. eds. Dicotyledons: Rosids (2nd ed). Illustrated Handbook of Succulent Plants. Cham: Springer International Publishing.

Walker, Colin (2022). A couple of cotyledons. New Zealand Cactus & Succulent Journal, 75(1) pp. 10–14.

Walker, Colin (2022). Agave × leopoldii. Cactus and Succulent Journal of NSW, 33(5 & 6) pp. 78–82.

Walker, Colin C. (2022). Palmer's Culture des Cactées – a rare cactus book. Bradleya, 2022(40) pp. 231–248.

Walker, Colin (2021). Sansevieria pinguicula - the 'walking' Sansevieria. Cactus & Succulent Review(31) pp. 17–20.

Walker, Colin (2021). Succulents contained: Sedum lucidum. CactusWorld, 39(4) p. 300.

Walker, Colin (2021). Aristaloe aristata: a unique, monotypic species. Haworthiad, 35(3) pp. 76–79.

Walker, Colin (2021). Aloe jacksonii updated. Haworthiad, 35 p. 59.

Walker, Colin (2021). Three South African Crassulas and the botanical art of Baron von Jacquin. Cactus & Succulent Review, 30 pp. 31–39.

Walker, Colin (2021). Stapelia divaricata Masson - the rarest and most localised species of Stapelia. CactusWorld, 39(3) pp. 247–249.

Walker, Colin (2021). Atlantic Aeoniums. New Zealand Cactus & Succulent Journal, 74(2) pp. 20–34.

Walker, Colin (2021). Kalanchoe tomentosa. Cactus and Succulent Review(29) p. 38.

Walker, Colin (2021). State of the world's plants and fungi. CactusWorld, 39(2) pp. 161–162.

Walker, Colin (2021). Dragon trees updated. CactusWorld, 39(2) p. 165.

Walker, Colin (2021). A survey of succulents of the mallow family (Malvaceae). CactusWorld, 39(2) pp. 135–148.

Walker, Colin (2021). Heidi Hartmann and a life with mesembs. CactusWorld, 39 pp. 164–165.

Walker, Colin (2021). Aloe squarrosa Baker - a unique and highly localised Socotran endemic. Haworthiad, 35(2) pp. 50–53.

Walker, Colin (2021). The succulents of Portmeirion Pottery. Cactus & Succulent Review(28) pp. 47–53.

Walker, Colin (2021). Agave evolution and taxonomy. CactusWorld, 39(1) pp. 73–74.

Walker, Colin (2021). A review of the Euphorbia schinzii complex in Southern Africa. CactusWorld, 39(1) pp. 74–75.

Walker, Colin (2021). Halting plant extinction webinar (November 2020). CactusWorld, 39(1) pp. 79–80.

Walker, Colin (2021). Pollination biology of Stenocereus queretaroensis and the importance of bat pollination services. CactusWorld, 39(1)

Walker, Colin (2021). Two succulent mallows: Ceiba speciosa and Pseudobombax ellipticum. New Zealand Cactus & Succulent Journal, 74(1) pp. 16–19.

Walker, Colin (2021). Aloe kedongensis - a shrubby Kenyan endemic. Haworthiad, 35(1) pp. 20–24.

Walker, Colin (2021). Aloe tewoldei - a rare, cliff-dwelling Ethiopian endemic. Haworthiad, 35(1) pp. 4–5.

Walker, Colin C. and Schultz, David (2021). Cactus & succulent books for children. Cactus and Succulent Journal (US), 93(2) pp. 197–204.

Walker, Colin (2021). Aloidendron dichotomum. Der Urtyp der Baumaloe. The archetypal tree aloe. Avonia, 39(3) pp. 210–219.

Walker, Colin C. (2020). Aloe forbesii - a small Socotran endemic. CactusWorld, 38(4) pp. 325–327.

Walker, Colin (2020). Agave pablocarrilloi. New Zealand Cactus & Succulent Journal, 73(2) pp. 13–15.

Walker, Colin C. (2020). Aloidendron barberae: the largest tree aloe. CactusWorld, 38(2) pp. 141–144.

Walker, Colin (2020). Literature review. McCoy, Tom. The Aloes of Arabia. CactusWorld, 38(2) pp. 154–155.

Walker, Colin (2020). Literature review. Stutchbury, Ralph. Baobab [Book review]. CactusWorld, 38(2) pp. 155–156.

Walker, Colin (2020). Aloe cremnophila - a cliff-dwelling Somali endemic. Haworthiad, 34(1) pp. 3–5.

Walker, Colin (2020). Aloidendron barberae: the world's largest tree aloe observed in New Zealand and South Africa. New Zealand Cactus & Succulent Journal, 73(1) pp. 17–21.

Walker, Colin (2020). Filiferous agaves. CactusWorld, 38(1) pp. 41–48.

Walker, Colin (2020). Beaucarnea Ruscaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants, 2 (2nd ed.). Berlin: Springer Reference, pp. 1319–1328.

Walker, Colin (2020). Dasylirion Ruscaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants, 2 (2nd ed.). Berlin: Springer Reference, pp. 1329–1335.

Walker, Colin (2020). Dracaena Ruscaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants, 2. Berlin: Springer Reference, pp. 1337–1344.

Walker, Colin (2020). Nolina Ruscaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants, 2 (2nd ed.). Berlin: Springer Reference, pp. 1345–1351.

Walker, Colin (2020). Laxmanniaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants, 2 (2nd ed.). Berlin: Springer Reference, pp. 1293–1294.

Walker, Colin (2020). Cordyline Laxmanniaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants, 2 (2nd ed.). Berlin: Springer Reference, pp. 1295–1296.

Walker, Colin (2020). Stapelia engleriana the "iceberg" species from Southern Africa. Asklepios, 126 pp. 15–16.

Walker, Colin (2020). Aloe huntleyana - a rare cliff-dwelling Namibian endemic. Haworthiad, 34(3) pp. 78–81.

Walker, Colin (2019). The life and times of Gordon Rowley (1921-2019). CactusWorld, 37(4) pp. 257–262.

Walker, Colin (2019). Two spectacularly spiny alluaudias. New Zealand Cactus & Succulent Journal, 72(3) pp. 5–8.

Walker, Colin (2019). Aloe spectabilis - a splendid South African species. Haworthiad, 33(3) pp. 58–59.

Walker, Colin (2019). Agave lophantha. New Zealand Cactus & Succulent Journal, 72(2) pp. 15–17.

Walker, Colin (2019). Kalanchoe arborescens - a Madagascan giant. Sedum Society Newsletter(130) pp. 81–84.

Walker, Colin (2019). Aloe elegans - an Ethiopian/Eritrean endemic? Haworthiad, 33(2) pp. 32–37.

Walker, Colin C.; Smith, Gideon F. and Figueiredo, Estrela (2019). Notes on the taxonomy, iconography, and ecology of Aloe pluridens Haw. (Asphodelaceae: Alooideae), an endemic species from southeastern South Africa. Bradleya, 37 pp. 60–72.

Walker, Colin C. (2019). Two shrubby Madagascan kalanchoes. New Zealand Cactus & Succulent Journal, 72(1) pp. 5–9.

Walker, Colin C. and Mace, Suzanne (2019). Aloe erensii, Aloe jucunda and a new cultivar. CactusWorld, 37(1) pp. 13–19.

Walker, Colin; Smith, G.F.; Crouch, N.R. and Condy, Gillian (2019). Caputia tomentosa. Flowering Plants of Africa, 66 pp. 168–178.

Walker, Colin; Smith, G.F.; Figueiredo, E.; Klopper, R.R.; Crouch, N.R. and Condy, Gillian (2019). Aloidendron barberae. Flowering Plants of Africa, 66 pp. 8–21.

Walker, Colin (2019). Aloe bakeri - a critically endangered highly localised Madagascan endemic. CactusWorld, 37(3) pp. 181–186.

Walker, Colin (2019). Foreword. In: Smith, Gideon F.; Figueiredo, Estrela and van Wyk, Abraham E. eds. Kalanchoe (Crassulaceae) in Southern Africa. London: Academic Press (Elsevier), ix-x.

Walker, Colin C. (2018). Flowering of Agave nickelsiae. CactusWorld, 36(4) pp. 290–291.

Walker, Colin C. (2018). Two rare Bolivian endemic cacti. New Zealand Cactus & Succulent Journal, 71(3) pp. 14–17.

Walker, Colin (2018). Beaucarnea RUSCACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants. Berlin, etc.: Springer Verlag.

Walker, Colin (2018). Nolina RUSCACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants. Berlin: Springer Verlag.

Walker, Colin C. (2018). Aloe littoralis - a review of this widespread African species. Haworthiad, 32(3) pp. 60–64.

Walker, C. C. (2018). Dracaena RUSCACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants (SUCCPLANTS). Springer Verlag.

Walker, Colin (2018). Cordyline LAXMANNIACEAE. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants. Berlin: Springer Verlag.

Walker, Colin (2018). Laxmanniaceae. In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants. Berlin: Springer Verlag.

Walker, Colin (2018). Dasylirion (Ruscaceae). In: Eggli, Urs and Nyffeler, Reto eds. Monocotyledons. Illustrated Handbook of Succulent Plants. Berlin: Springer Verlag.

Walker, Colin C. (2018). Two choice African Sansevierias: S. hargeisana and S. hallii. New Zealand Cactus & Succulent Journal, 71(2) pp. 4–8.

Walker, Colin C. (2018). Guest editorial. CactusWorld, 36(2) p. 88.

Walker, Colin C. and Vanden Bon, Alice (2018). Aloe pearsonii - a unique species in habitat and in cultivation. CactusWorld, 36(1) pp. 33–40.

Walker, Colin C. (2018). Echinocereus pensilis updated. New Zealand Cactus & Succulent Journal, 71(1) pp. 14–15.

Walker, Colin (2018). Stapelia gigantea - "der Goliath dieser Gattung". Avonia, 36(2) pp. 124–125.

Walker, Colin C. (2018). The stapeliads of Philip Miller at the Chelsea Physic Garden. Asklepios, 125 pp. 12–17.

Walker, Colin C. (2017). Two stapelias: Stapelia gigantea and S. schinzii var. angolensis. New Zealand Cactus & Succulent Journal, 70(3) pp. 6–8.

Walker, Colin (2017). Two architectural agaves: A. victoriae-reginae and A. nickelsiae. Cactus and Succulent Journal of NSW, 31(1) pp. 9–13.

Walker, Colin C. (2017). Aloe tomentosa – eine Art mit ungewöhnlichen, behaarten Blüten aus dem Jemen. Sukkulenten, 103(7-8) pp. 29–37.

Walker, Colin C. (2017). Introducing the genus Phedimus. New Zealand Cactus & Succulent Journal, 70(2) pp. 4–7.

Walker, Colin C. (2017). A tale of two Ethiopian aloes: Aloe jacksonii & A. elkerriana. Haworthiad, 31(2) pp. 31–32.

Walker, Colin C. (2017). Aloe mitriformis subsp. distans: the small mitre aloe. New Zealand Cactus and Succulent Journal, 70(1) pp. 4–7.

Walker, Colin C. (2017). Aloe pulcherrima - a beautiful Ethiopian endemic. CactusWorld, 35(2) pp. 131–135.

Walker, Colin C. (2017). A new intergeneric hybrid: xGastonialoe 'Gordon Rowley'. CactusWorld, 35(1) pp. 21–22.

Walker, Colin C. (2017). Agave victoriae-reginae and its close relatives. CactusWorld, 35(3) pp. 159–166.

Walker, Colin C. (2017). My first flowering of Aloe reynoldsii. Haworthiad, 31(3) pp. 70–71.

Walker, Colin C. (2017). CactusTalk: More dragon tree tales. CactusWorld, 35(4) pp. 287–288.

Walker, Colin (2016). Aloe tomentosa - a species with unusual hairy flowers from the Yemen. CactusWorld, 34(3) pp. 153–158.

Walker, Colin (2016). Aloe vera on Lanzarote. New Zealand Cactus & Succulent Journal, 69(2) pp. 20–23.

Walker, Colin C. (2016). A couple of Curios. Northants News, 27(1) pp. 5–7.

Walker, Colin (2015). Beaucarnea updated. CactusWorld, 33(4) pp. 267–272.

Walker, Colin and Smith, Gideon F. (2015). Eric Judd - South African Aloe artist. CactusWorld, 33(1) pp. 59–63.

Walker, C. C.; Klopper, R. R.; Smith, G. F. and Condy, Gillian (2015). Aloe succotrina (Asphodelaceae). Flowering Plants of Africa, 64 pp. 26–40.

Walker, Colin (2015). The origin and predominance of Aloe vera. CactusWorld, 33(4) pp. 276–277.

Walker, Colin (2015). Dasylirion wheeleri. Northants News, 26(3) pp. 7–8.

Walker, Colin (2014). Aloe hardyi - a rare South African cremnophyte. CactusWorld, 32(4) pp. 289–292.

Walker, Colin (2014). More changes in Haworthia. CactusWorld, 32(4) p. 304.

Walker, Colin (2014). More change in Aloe, Haworthia and their close relatives. CactusWorld, 32(2) pp. 138–139.

Walker, Colin (2014). All change in Dracaena and Sansevieria. CactusWorld, 32(2) pp. 140–141.

Walker, Colin (2014). All change in Aloe and Haworthia. Cactus and Succulent Journal of NSW, 29(4) pp. 78–80.

Walker, Colin and Thorburn, Marjorie (2014). The World's biggest cactus flowers. Northants News, 25(3) pp. 12–13.

Walker, Colin (2014). Aloe cremnophila and Aloe jacksonii - cliff-dwellers from the Horn of Africa. Northants News, 25(2) pp. 14–16.

Walker, Colin (2013). All change in Aloe and Haworthia. CactusWorld, 31(4) p. 297.

Walker, Colin (2013). Two Kenyan sansevierias of Peter Bally. Northants News, 24(2) pp. 6–7.

Walker, Colin (2012). A cholla cactus and a grasshopper. CactusWorld, 30(4) pp. 233–234.

Walker, Colin (2011). Agaves through the ages. Cactus and Succulent Journal of NSW, 27(8) pp. 153–156.

Walker, Colin (2011). The name game. Cactus and Succulent Journal of NSW, 27(8) pp. 170–177.

Walker, Colin (2011). Macaronesian memories. The succulents of the Canary Islands, Morocco and Madeira. Cactus and Succulent Journal of NSW, 27(8) pp. 182–186.

Walker, Colin (2011). Foreword. In: Craib, Charles and Lavranos, John eds. The Bushman Candles. Bryanston, South Africa: Penrock Publications, x-xi.

Walker, Colin (2010). Gilbert Westacott Reynolds: his study of Aloe and a bibliography of his work. Bradleya, 28, pp. 111–124.

Walker, Colin (2009). Editorial: Darwin and Kew anniversaries. Bradleya, 27 pp. 1–2.

Walker, Colin (2008). A new name in Monsonia. CactusWorld, 26(4) pp. 248–249.

Walker, Colin C. (2008). Brachystelma bracteolatum Meve a rare Nigerian endemic. Asklepios, 103 pp. 19–22.

Walker, Colin C. (2007). Bradleya 25 and the Linnaean legacy. Bradleya, 25 pp. 1–8.

Walker, Colin (2005). A tale of two Arabian aloes. British Cactus & Succulent Journal, 23 pp. 175–179.

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Walker, Colin C. (2005). xTavarorbea - another intergeneric hybrid stapeliad. Asklepios(92) pp. 7–8.

Walker, Colin (2004). Two succulent aroids. British Cactus & Succulent Journal, 22 pp. 185–187.

Walker, Colin (2004). A new intergeneric hybrid stapeliad. New Zealand Cactus & Succulent Journal, 57(4) 103-107 + cover.

Walker, Colin (2004). A history of succulent exploration in East and North-East Africa. In: The Succulent Plan Easte.

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Walker, Colin (2003). Crassulaceae (Umbilicus). In: Eggli, Urs ed. Crassulaceae. Illustrated Handbook of Succulent Plants (6). Berlin: Springer-Verlag, pp. 364–367.

Walker, Colin (2002). James Harvey Callander and his rare publication: Cactus Culture for Amateurs (1906). Cactus and Succulent Journal (US), 74(3) pp. 121–126.

Walker, Colin (2002). Asteraceae (Baeriopsis). In: Eggli, Urs ed. Dicotyledons. Illustrated Handbook of Succulent Plants, 4. Berlin: Springer-Verlag, p. 20.

Walker, Colin (2002). Bombacaceae (Adansonia, Cavanillesia, Ceiba, Pseudobombax). In: Eggli, Urs ed. Dicotyledons. Illustrated Handbook of Succulent Plants (4). Berlin: Springer-Verlag, pp. 48–52.

Walker, Colin (2002). Oxalidaceae (Oxalis). In: Eggli, Urs ed. Dicotyledons. Illustrated Handbook of Succulent Plants. Berlin: Springer-Verlag, pp. 333–336.

Walker, Colin (2002). Urticaceae (Laportea, Obetia, Pilea). In: Eggli, Urs ed. Dicotyledons. Illustrated Handbook of Succulent Plants (4). Berlin: Springer-Verlag, pp. 447–450.

Walker, Colin (2002). Urticaceae (Laportea, Obetia, Pilea). In: Eggli, Urs ed. Zweikeimblaettrige Pflanzen (Dicotyledonen). Sukkulenten-Lexikon, 2. Stuttgart: Verlag Eugen Ulmer, pp. 478–480.

Walker, Colin (2001). Introducing the Nolinaceae. British Cactus & Succulent Journal, 19(4) pp. 214–221.

Walker, Colin (2001). Dracaenaceae (Cordyline, Dracaena). In: Eggli, Urs ed. Monocotyledons. Illustrated Handbook of Succulent Plants (1). Berlin: Springer-Verlag, pp. 258–261.

Walker, Colin (2001). Nolinaceae (Beaucarnea, Calibanus, Dasylirion, Nolina). In: Eggli, Urs ed. Monocotyledons. Illustrated Handbook of Succulent Plants (1). Berlin: Springer-Verlag, pp. 286–292.

Walker, Colin C. (2000). Canaries and kasbahs - the succulents of the Canary Islands and Morocco - Part 2. New Zealand Cactus & Succulent Journal, 53(3) pp. 70–77.

Walker, Colin C. (2000). Canaries and kasbahs - the succulents of the Canary Islands and Morocco. New Zealand Cactus & Succulent Journal, 53(2) pp. 36–49.

Walker, Colin C. and Downs, Philip E. (2000). John Medley Wood's Natal Asclepiads. Asklepios(79) pp. 3–9.

Walker, Colin C. (2000). Agave attenuata and some new cultivars. British Cactus & Succulent Journal, 18(2) pp. 95–98.

Walker, Colin (1999). Arabian asclepiads of Albert Deflers. Asklepios(76) pp. 23–32.

Walker, Colin (1999). A tale of dragons - the pachycaul species of Dracaena. British Cactus & Succulent Journal, 17(4) pp. 171–177.

Walker, Colin (1997). A question of balance: when is a Caralluma a Caralluma and not a Caudanthera? Asklepios(72) pp. 12–13.

Walker, Colin (1997). A.A. Bullock and his asclepiad studies. Asklepios(72) pp. 20–24.

Walker, Colin (1997). Van Rheede and the first Ceropegia. Asklepios(71) pp. 26–34.

Walker, Colin C. (1996). James Donn and the succulents of 'Hortus Cantabrigiensis'. Bradleya, 14 pp. 20–28.

Walker, Colin (1994). Echeveria setosa var. deminuta. British Cactus & Succulent Journal, 12(3) pp. 90–91.

Walker, Colin (1994). Robert Brown's contributions to asclepiad study. Asklepios(62) 20-34, plate 1.

Walker, Colin C. (1994). Frederick Scheer (1792-1868) of Kew. Kew Magazine, 11(2) pp. 74–81.

Walker, Colin (1994). Sansevierias make scents. British Cactus & Succulent Journal, 12 p. 92.

Walker, Colin (1993). Pilea peperomioides - a Chinese member of the stinging nettle family. British Cactus & Succulent Journal, 11(4) pp. 98–99.

Walker, Colin (1992). A note on the Carallumas of Jordan. Asklepios(55) pp. 17–19.

Walker, Colin C. (1991). Aloe dumetorum Mathew & Brandham - a dwarf Kenyan endemic. British Cactus & Succulent Journal, 9(2) pp. 28–31.

Walker, C. C. and Thorburn, M. (1991). Kleinia (Senecio) anteuphorbium (L.)Haw. - a Moroccan endemic. Aloe, 28(1) pp. 18–22.

Walker, Colin C. (1990). Pelargonium ceratophyllum L'Herit: the antler-leaved stork's bill. British Cactus & Succulent Journal, 8 pp. 84–86.

Walker, Colin (1990). Trichosacme lanata Zucc. - a woolly Mexican asclepiad. Asklepios, 51 pp. 56–59.

Walker, Colin C. (1988). Cussonia paniculata: the mountain cabbage tree. British Cactus & Succulent Journal, 6(4) pp. 98–100.

Walker, C. C. (1988). xBrachypelia: a novel intergeneric hybrid. Asklepios, 43 pp. 83–86.

Walker, Colin C. and Thorburn, Marjorie (1987). The euphorbias of Gran Canaria, Canary Islands. The Euphorbia Journal, 4 pp. 32–47.

Walker, C. C. (1987). Pelargonium crassicaule L'Herit. Aloe, 24(2) pp. 32–34.

Walker, Colin (1987). Dischidia - an obscure organism? Asklepios, 40 pp. 75–80.

Walker, Colin (1986). More on Dischidia. Asklepios, 38 pp. 11–13.

Walker, Colin C. (1985). Adenia glauca: a 'lump' with an interesting life-style. British Cactus & Succulent Journal, 3(1) pp. 18–20.

Walker, C. C. (1985). Dischidia: an introduction to asclepiad ant plants. Asklepios, 35 pp. 3–11.

Walker, C. C. (1984). Cremnophila nutans: A Sedum under another name? British Cactus & Succulent Journal, 2(4) pp. 100–103.

Walker, C.C. (1983). Sarcostemma: leafless succulent lianas. Asklepios, 29 pp. 18–21.

Walker, C.C. (1983). The ciliated Orbea. Asklepios, 27 pp. 59–63.

Walker, C. C. (1982). Brachystelma: an introduction and checklist. Asklepios, 25 pp. 92–106.

Walker, Colin (1981). A new name in Brachystelma. Asklepios, 24 pp. 66–67.

Walker, Colin (1980). More on Tridentea Haw. Asclepiadaceae, 20 pp. 7–10.

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