By IUCN/SSC Cactus and Succulent Specialist Group, Sara Oldfield
Read or Download Cactus And Succulent Plants: Status Survey And Conservation Action Plan PDF
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Additional info for Cactus And Succulent Plants: Status Survey And Conservation Action Plan
It is not easily eradicated and in some places has spread to the detriment of the natural vegetation, not only in Africa but also elsewhere in tropical regions. As a succulent species it is listed under Appendix II of CITES and thus protected, but can always be easily distinguished from ‘look-alike’ species by its distinctively striated branches. However, the pair-spined succulents provide the greatest number of species north of South Africa. The range in habit is very wide from trees and shrubs, to succulent-stemmed herbs.
The species which contain alkaloids or bufadienolides, are generally unpalatable or even poisonous. (Hylotelephium, Orostachys, Rhodiola, Rosularia, Sedum). A remarkable feature of the Asian Crassulaceae is the predominance of taxa with annual, leafy, flowering shoots in combination with a rhizome (Rhodiola, c. , Sedum sect. ) or tuberous roots (Hylotelephium, c. ). Rhodiola is mainly found at high altitudes in the Himalayas, whereas Hyloptelephium and Sedum sect. Aizoon occur at less elevated and more mesic habitats from south-western China to eastern Asia.
Besides, the new genus Amphipetalum recently described from Argentina (Bacigalupo 1988) seems to be closely related to Talinum. Also, the relationship between Calyptrotheca and Talinum should be re-evaluated. In recent years, there have been several attempts to re-examine the generic relationship within the family. A synoptical classification of Portulacaceae was proposed by McNeil1 (1974). This showed, however, that many questions concerning the systematics of portulacaceous genera still remain to be answered.