Flavonoid chemistry of the generic segregates Ascyrum and Crookea of Hypericum
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Leaf flavonoids were isolated and characterized from the seven taxa of Hypericum, formerly segregated as Ascyrum and Crookea. These included flavonol 3-glycosides based on quercetin and kaempferol and flavone-O-glycosides and C-glycosides based on apigenin and luteolin. The flavonoid data do not indicate that the taxe of Ascyrum and Crookea form a single coherent group and hence support their merger with Hypericum.
Calie, Pat; Schilling, Edward E.; and Webb, David H., "Flavonoid chemistry of the generic segregates Ascyrum and Crookea of Hypericum" (1983). EKU Faculty and Staff Scholarship. 560.
Biochemical Systematics and Ecology