Epimedium grandiflorum

Bishops hat - Fairy wings - Barrenwort - Horny goat weed - Berberidaceae - flowers have nectar spurs that stick out - bee + butterfly love - asymmetric heart-shaped leaves soft and toothed - dry shade - underground rhizomes - 15-23cm tall - spring flowering - light purple flowers red stems - China Japan Korea - "It may have aphrodisiac characteristics due to the presence of icariin and is believed to cause increased sexual activity in goats" Wikipedia