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FOC | Family List | FOC Vol. 6 | Ranunculaceae

15. Isopyrum Linnaeus, Sp. Pl. 1: 557. 1753.
[nom. cons.]

扁果草属 bian guo cao shu

Fu Dezhi; Orbélia R. Robinson

Herbs perennial. Stem erect, smooth, glabrous. Leaves 2 × ternately compound. Basal leaves abaxially pale green, adaxially green. Stem leaves shortly petiolate; petiole sheathed; sheath white, membranous. Inflorescences panicled or cymose; bracts 1 or 2 × ternately compound, 3-lobed, or 3-sect. Flowers radially symmetric, small. Pedicel slender. Sepals 5, white, petaloid. Petals 5, much smaller than sepals, basally tubulose or shallowly scrotiform and shortly clawed. Stamens 20--30; filaments sublinear, 1-veined; anthers yellow, broadly ellipsoid. Pistils 1--5, free, erect, narrowly ovate; ovules numerous, arranged in 2 rows on ventral suture. Follicles 1--5, ellipsoid-ovoid, flat, horizontally veined, apically with a curved beak. Seeds numerous, black to blackish, ovoid to ellipsoid, smooth.

Four species: Asia, Europe, North America; two species (one endemic) in China.

1 Basal leaves numerous; bracts ovate, 3-parted to 3-sect   1 I. anemonoides
+ Basal leaves few; bracts subtriangular, lower ones 2-ternate, uppermost one ternate   2 I. manshuricum

Lower Taxa


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