UW Burke Herbarium species comparison

Leaves trifoliate, the leaflets ovate, nearly glabrous, doubly serrate, the terminal one 4-9 cm. long, the others smaller, often lobed.

Flowers 1-2 on short leafy branches;

calyx pubescent, the 5 lobes ovate-lanceolate, pointed, spreading, 9-15 mm. long;

petals 5, purplish-red, obovate-elliptic, half again as long as the sepals;

stamens 75-100;

pistils numerous.

Drupelets yellow to reddish, weakly coherent, coming free from the receptacle.