Variation in icariin and flavonoid contents of barrenwort accessions native to Guizhou, China

Flavonoid and icariin contents of 87 samples drawn from 21 accessions of seven species native to Guizhou, China, of the genus Epimedium were determined by means of ultraviolet and high-performance liquid chromatography. The contents differed significantly among the species and accessions. E. acuminatum, E. yinjiangense, E. myrianthum, E. wushanense, and E. simplicifloum had greater amounts of flavonoids and icariin than E. letorrhizum and E. luodianense.