Epimedium L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1964, Flora Europaea - Volume 1. Lycopodiaceae to Platanaceae, Cambridge University Press : 245

4. Epimedium L. 1

Rhizomatous herbs. Leaves compound. Flowers 2-merous, in panicles. Perianth-segments 8, the outer 4 sepaloid, the inner 4 petaloid. Honey-leaves 4, flat proximally and tubular distally (slipper-shaped). Stamens 4. Fruit many-seeded, dry, dehiscing into 2 unequal valves.

Literature: W. T. Stearn, Jour. Linn. Soc. London (Bot.) 51: 409 (1938).

Inflorescence shorter than cauline leaf; inner perianth-segments dark red 1. alpinum Inflorescence overtopping cauline leaf; inner perianth-segments pink 2. pubigerum