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FNA | Family List | FNA Vol. 3 | Ranunculaceae

2a.5. Ranunculus Sect. Hecatonia de Candolle, Prodr. 1: 30. 1824.

Plants glabrous or sometimes hirsute. Stems creeping (erect in Ranunculus sceleratus ), not bulbous-based, without bulbils. Roots basal and usually also nodal, never tuberous. Leaves all cauline or both basal and cauline; basal and lower cauline leaves similar, petiolate, blades lobed to divided or (submerged leaves) deeply dissected, segments undivided or lobed. Inflorescences 2-25-flowered cymes or axillary solitary flowers. Flowers pedicellate; sepals deciduous soon after anthesis, 3-5; petals 3-14, yellow; nectary scale variable, forming crescent-shaped ridge surrounding but not covering nectary, or funnel-shaped tube surrounding nectary, or distal margin of funnel expanded to form large flap, then nectary sometimes displaced onto flap, glabrous, free margin entire; style present or absent. Fruits achenes, 1-locular; achene body thick-lenticular or compressed-ellipsoid to discoid, 1.2-3 times as wide as thick, not prolonged beyond seed; achene wall thick, smooth or with weak transverse wrinkles, glabrous; margin a thick, low or high corky band or ridge; beak much shorter than achene body or sometimes absent.

Species ca. 15 (4 in the flora): widespread, in marshy or aquatic habitats.

1 Stems erect, rooting only at base (very rarely also at proximal nodes).   61 Ranunculus sceleratus
+ Stems prostrate and rooting at nodes, or floating and rootless.   (2)
2 (1) Leaf blades 0.3–1.2 cm, deeply 3-lobed or -parted, terminal segment entire or distally crenulate; nectary-scale low crescent-shaped ridge surrounding nectary; style 0.1–0.2 mm.   60 Ranunculus hyperboreus
+ Leaf blades 0.6–7.3 cm, 3-parted, terminal segment again lobed or dissected; nectary-scale a free flap, nectary on surface of flap; style 0.2–1.2 mm.   (3)
3 (2) Styles 0.2–0.4 mm in flower; achenes 1–1.6 mm, beaks 0.4–0.8 mm; petals 3–7 mm   62 Ranunculus gmelinii
+ Styles 0.8–1.2 mm in flower; achenes 1.8–2.2 mm, beaks 1–1.8 mm; petals 7–12 mm.   63 Ranunculus flabellaris


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