New Zealand Journal of Botany abstracts

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Some flavonoid components of Carmichaelia (Papilionaceae) ó a chemotaxonomic survey

ANDREW W. PURDIE

Botany Division, DSIR
Private Bag, Christchurch, New Zealand

Abstract The flavonoid analysis of 31 species of Carmichaelia shows the presence of isoflavones, flavonol 3-O-glycosides, flavonol 7-O-glycosides, flavonol 3, 7-di-O-glycosides, and flavone C-gly- cosides. Acid hydrolysis of 3-O-glycosides has yielded three flavonol aglycones ó quercetin, isor- hamnetin, and kaempferol ó which are common to nearly all species, with one aglycone being dom- inant in each of them. Distribution of the domi- nant flavonol aglycones, and of the naturally occurring flavone C-glycosides, is seldom related to taxonomic boundaries but is predominantly geo- graphical. Flavonoid analysis, together with the absence of distinct intraspecific and interspecific characters in the current classification of Carmi- chaelia, suggests that many species are closely related to one another. This study indicates that the correlation between flavonoid chemistry and the present taxonomic treatment of Carmichaelia is inconsistent. The need for a revision of the tax- onomy of Carmichaelia is indicated.

Keywords Carmichaelia ; chemotaxonomy; flavonoids; flavonol glycosides; flavonol aglycones; C-glycosylflavonoids; New Zealand; Lord Howe Island

Received I August 1983; accepted 3 October 1983
New Zealand Journal of Botany, 1984, Vol. 22: 7-14
0028-825X/84/2201-0007$2.50/0 © Crown copyright 1984

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