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FNA | Family List | FNA Vol. 3 | Ranunculaceae

2e. Ranunculus Subg. Batrachium (de Candolle) A. Gray, Proc. Amer. Acad. Arts. 21: 363. 1886.

Ranunculus sect. Batrachium de Candolle, Syst. Nat. 1: 233. 1817; Batrachium (de Candolle) Gray

Plants glabrous (or sheathing leaf bases sometimes pubescent). Stems creeping or floating, not bulbous-based, without bulbils. Roots nodal, never tuberous. Leaves cauline, either simple and laminate (with expanded blade), or completely dissected into filiform segments, or with proximal leaves filiform-dissected and distal leaves laminate; laminate leaves petiolate, undivided or 3-parted, segments entire to shallowly cleft and crenate; filiform-dissected leaves petiolate or sessile. Inflorescences axillary, solitary flowers. Flowers pedicellate; sepals deciduous soon after anthesis, 5; petals 5, white or white with yellow claws; nectary scale attached on 3 sides, forming ridge or shallow pocket not covering nectary, glabrous, free margin entire; style present. Fruits achenes, 1-locular; achene body ellipsoid or flattened-ellipsoid, 1-2 times as wide as thick, not prolonged beyond seed; wall thick, with coarse transverse ridges; margin low narrow ridge; beak much shorter than achene body.

Species ca. 15 (3 in the flora): widespread except lowland tropics.

Unlike most species of Ranunculus , members of this subgenus are not poisonous.


1 Leaves all dissected into filiform segments.   73b var. diffusus
+ Leaves not all filiform-dissected, all or some laminate and shallowly to deeply 3-lobed or -parted.   (2)
       
2 (1) Leaves all laminate, margins shallowly crenate-lobulate, segments rounded; e North America.   71 Ranunculus hederaceus
+ Leaves of 2 types: laminate and filiform-dissected (filiform-dissected leaves sometimes few and inconspicuous in R. lobbii); laminate leaves 3-parted, segments elliptic, obovate, or fan-shaped; w North America.   (3)
       
3 (2) Receptacle glabrous; style 1–1.5 mm.   72 Ranunculus lobbii
+ Receptacle hispid; style 0.1–0.8 mm.   73a var. aquatilis

Lower Taxa


 

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