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FNA | Family List | FNA Vol. 3 | Ranunculaceae | Ranunculus

49. Ranunculus glaberrimus Hooker, Fl. Bor.-Amer. 1: 12. 1829.

Stems prostrate or ascending, 4-15 cm, glabrous, each with 1-4 flowers. Roots cylindric, 1-3 mm thick. Basal leaves persistent, blades reniform or obovate to very narrowly elliptic, 0.7-5.2 × 1-2 cm, base truncate, obtuse or attenuate, margins entire or with 3 broad, apical crenae, apex rounded to acute. Flowers: pedicels glabrous or nearly so; receptacle glabrous; sepals 5-8 × 3-7 mm, abaxially glabrous or sparsely pilose, hairs colorless; petals 5-10, 8-13 × 5-12 mm; nectary scale glabrous or ciliate. Heads of achenes globose, 7-12(-20) × 6-11(-20) mm; achenes 1.4-2.2 × 1.1-1.8 mm, usually finely pubescent; beak subulate or lance-subulate, straight or curved, 0.4-1 mm.

Varieties 2 (2 in the flora): North America.

Usually only a minority of the ovaries develop, and the fruiting receptacle is completely hidden by aborted ovaries. Populations growing at high elevations ( Ranunculus glaberrimus var. ellipticus ) and low elevations (var. glaberrimus ) are usually well differentiated, but these varieties intergrade at intermediate elevations.

The Thompson Indians rubbed the flowers or the whole plant of Ranunculus glaberrimus on arrow points as a poison (D. E. Moerman 1986).

1 Basal leaf blades ovate to obovate, usually shallowly lobed; bracts 3-lobed, lobes equal in size; 400–2000 m.   49a var. glaberrimus
+ Basal leaf blades elliptic to oblanceolate, usually undivided; bracts 3-lobed, middle lobe much larger; 1200–3600 m.   49b var. ellipticus

Lower Taxa


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