Spiraea lucida

General:
Deciduous, nearly glabrous shrubs from strong rhizomes, the stems 2.5-6 dm. tall.
Leaves:
Leaves alternate, ovate-oblong to obovate, 2-7 cm. long, coarsely and usually doubly serrate, dark green on the upper surface, paler on the lower.
Flowers:
Inflorescence a flat-topped raceme 3-8 cm. broad; calyx glabrous, the tubular portion hemispheric, 1-1.5 mm. wide, the 5 lobes triangular; petals 5, dull white, often with a pinkish tinge, 2 mm. long; stamens 25-50; pistils.. more