Flavone glycosides from Asplenium normale.

Eight flavone glycosides were isolated from fronds of Asplenium normale, its two varieties, var. boreale and var. shimurae, and related species, A. oligophlebium. Six of the glycosides were identified: apigenin 7-O-dirhamnoside and 7-O-glucosylrhamnoside, luteolin 7-O-dirhamnoside and 7-O-glucosylrhamnoside, genkwanin 4'-O-glucosylrhamnoside, and vicenin-2. The remaining two glycosides were tentatively characterized as genkwanin 4'-O-glycoside and 6,8-di-C-glycosylluteolin. The four taxa analysed in this survey all had distinctive flavonoid profiles.