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Floral flavonoids and the systematics of Simsia (Asteraceae: Heliantheae)
- Schilling, E.E., Spooner, D.M.
- Systematic botany 1988 v.13 no.4 pp. 572
- Asteraceae, chemotaxonomy, interspecific hybridization, flavonoids, generic drugs, chromatography
- Data from flora flavonoid chemistry of Simsia are not of widespread use in analyzing interspecific relationships but bear on a few problems within the genus. Most members of the "S. fruticosa group" share a relatively simple floral flavonoid profile based on quercetin glycosides. In the "S. amplexicaulis group", which is characterized by flavone glycosides in addition to quercetin glycosides, the presence of apigenin 7-glucoside links S. lagascaeformis and S. eurylepis, and the presence of coreopsin/sulfurein unites S. foetida, S. grandiflora, S. guatemalensis, S. megacephala, and S. panamensis. The presence of coreopsin/sulfurein in S. chaseae provides a chemical trait to link it to S. foetida, one of the putative parental species in the hypothesis of diploid hybrid speciation that has been proposed for its origin. At the generic level, the occurrence of anthochlors links Simsia to Viguiera and related genera. Among these genera it appears that in floral flavonoids Simsia is characterized by a relatively distinctive compound, quercetin 3-glucuronide.