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The Chemotaxonomic Value of 10-Hydroxyaloin B and Its Derivatives in Aloe Series Asperifoliae Berger
A. M. Viljoen, B. -E. van Wyk and E. Dagne
Vol. 51, No. 1 (1996), pp. 159-168
Stable URL: http://www.jstor.org/stable/4118753
Page Count: 10
You can always find the topics here!Topics: Species, Chemicals, Inflorescences, Plant biochemistry, Leaves, Cladistics, We they distinction, Panicles, Bracts, Sympatric species
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A chemotaxonomic and cladistic study of Aloe series Asperifoliae and related species is presented. The leaf exudate of most species included in, or pertaining to series Asperifoliae have littoraloin, deacetyllittoraloin and 10-hydroxyaloin B. Aloe viridiflora is misplaced in series Asperifoliae, as the chemical composition of the exudate and morphological characters are remarkably different from all other members of the group, but similar to the more distantly related A. hereroensis (both have homonataloin as major anthrone). Aloe littoralis is a logical outgroup for the series Asperifoliae because it is chemically identical to most members of the group. A cladistic analysis, based on chemical and morphological data, is presented, together with an interpretation of distribution patterns. Our results give a new perspective on natural relationships and are consistent with the hypothesis that the Asperifoliae is an extremely xerophytic southern clade of tropical origin, with A. littoralis as the basal species.
Kew Bulletin © 1996 Royal Botanic Gardens, Kew