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FOC | Family List | FOC Vol. 9 | Rosaceae

31. ACOMASTYLIS Greene, Leafl. Bot. Observ. Crit. 1: 174. 1906.

羽叶花属 yu ye hua shu

Li Chaoluan (Li Chao-luang); Hiroshi Ikeda, Hideaki Ohba

Herbs perennial, low, tufted, with stout rootstock. Radical leaves pinnate; leaflets numerous, margin cleft or toothed; cauline leaves few, reduced. Flowers terminal, solitary or very few in cymes. Hypanthium ± turbinate. Sepals 5, valvate; epicalyx segments smaller, alternate with sepals. Petals 5, yellow. Stamens numerous, inserted at mouth of hypanthium. Carpels numerous, densely hirsute or only sparsely so near apex, apically tapered into persistent, glabrous style; ovule basal; style not elongating in fruit. x = 7.

About 15 species: E Asia, North America; two species in China.

1 Radical leaves broadly linear in outline, interruptedly or compactedy pinnate, with 9–13 pairs of leaflets; sepals green, ca. 2 × as long as epicalyx segments; petals glabrous; style glabrous or sparsely pilose at base.   1 A. elata
+ Radical leaves lyrately pinnate, with 5–10 pairs of leaflets; sepals usually purple-brownish yellow, 3–4 × as long as epicalyx segments; petals abaxially sparsely pilose; style hirsute except at apex.   2 A. macrosepala

Lower Taxa


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