Jh. Mun et Cw. Park, FLAVONOID CHEMISTRY OF POLYGONUM SECT TOVARA (POLYGONACEAE) - A SYSTEMATIC SURVEY, Plant systematics and evolution, 196(3-4), 1995, pp. 153-159
Polygonum sect. Tovara includes three controversial species; P. virgin
ianum, P. filiforme, and P. neofiliforme. The flavonoid chemistry of t
hese was examined to provide additional information on their delimitat
ion and levels of differentiation. Eight flavonoid compounds were isol
ated and identified, all of which were 3-O-glycosides of the flavonols
kaempferol, quercetin, and myricetin, and their acylated derivatives.
Although they exhibit relatively simple flavonoid profiles, the three
taxa are readily distinguished by their flavonoid constituents. In ad
dition, they show fundamental differences in flavonol types and glycos
ylation patterns. These results, in conjunction with evidence from the
morphology, strongly suggest that P, virginianum, P. filiforme, and P
. neofiliforme are closely allied but distinct species.