Past Webinar: Tree Aloes with Colin C. Walker

Join us Saturday, May 18th, at 10am PST for the next CSSA Webinar. Colin C. Walker will explore the world of tree aloes, the largest of the alooids.

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Event Info

Date: May 18th, 2024
Time: 10AM Pacific Time (California)

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Tree Aloes with Colin C. Walker

Tree aloes are the biggest of the alooids with one species growing up to 60 feet tall. These plants all have well branched woody stems with dichotomous (forked) branching patterns and usually rough peeling bark. Characteristically, unlike many true aloes, the dead leaves are not persistent.

This presentation will begin with the history, since some tree aloes were amongst the earliest aloes to be discovered and described. Until 2013, these were included within Aloe but then molecular evidence showed conclusively that the tree aloes diverged very early in the evolutionary history of these plants, recognized with the establishment of a separate genus, Aloidendron. This contains just six species, mostly from southern Africa, but with a single disjunct species, A. eminens, in Somalia. The species will be described in habitat and cultivation, including their main characteristics, distributions and conservation status. Notably one species, A. pillansii, is critically endangered in the wild.

About our Speaker

Colin C. Walker’s research has focussed on the biodiversity and taxonomy of succulents, notably aloes and agaves. In 2011 he was co-author of Aloes – The Definitive Guide with Susan Carter, John Lavranos, & Len Newton, published jointly by the Royal Botanic Gardens, Kew, and the British Cactus & Succulent Society (BCSS). He is currently working on the 2nd edition of The Illustrated Handbook of Succulent Plants published by Springer, for which he’s researching the daisy family (the Asteraceae).

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Photo Credits: Colin C. Walker and Aloe Britannica