Epimedium flavum (barrenwort)
Yellow flowers of Epimedium flavum
Epimedium flavum Stearn
barrenwort, tian quan yin yang huo (China)
Vulnerable (VU) according to IUCN Red List criteria.
About this species
More species of Epimedium grow in China at elevations between 500 m and 3,700 m in the woodlands of Sichuan Province in than in any other region. One of these, Epimedium flavum was first collected there in 1992 and named in 1995 by the British botanist William Stearn. Two other yellow-flowered species from the same area are similar: E. davidii (with smaller, red inner sepals, usually larger leaves and compact rhizome) and E. fangii (pale reddish inner sepals and creeping rhizomes).
William Stearn named Epimedium flavum and many other species of Epimedium and wrote the monograph, The Genus Epimedium and other Herbaceous Berberidaceae, published by the Royal Botanic Gardens, Kew in 2002.