EcoFlora - Ranunculus hispidus

Ranunculus hispidus Michx.
Family: Ranunculaceae Bristly Buttercup [Ranunculus marilandicus Poir.] Paul Rothrock	FNA Gleason & Cronquist Resources Alan T. Whittemore in Flora of North America (vol. 3) Stems erect or decumbent, sometimes rooting nodally, hispid or strigose, base not bulbous. Roots never tuberous. Basal leaf blades ovate to deltate in outline, 3-foliolate or outer blades merely 3-parted, 2-13.4 × 2.4-16.8 cm, leaflets undivided to lobed or parted, ultimate segments narrowly elliptic or oblanceolate to circular, margins toothed, apex acuminate to rounded. Flowers: receptacle hispid; sepals spreading or reflexed, 4-10 × 2-5 mm, hispid; petals 5, yellow, 8-16 × 3-9 mm. Heads of achenes hemispheric to short-ovoid, 6-10 × 7-10 mm; achenes 2.2-5.2 × 2-3.8 mm, glabrous, margin forming narrow rib or broad wing 0.1-1.2 mm wide; beak persistent, lance-subulate, straight or somewhat curved, 0.8-2.6 mm. Until recently, the varieties of Ranunculus hispidus were usually treated as distinct species. Arguments for restoring species status to R . hispidus var. nitidus were given by G. L. Nesom (1993). Vascular plants of NE US and adjacent Canada Fibrous-rooted perennial 1.5-9 dm, sometimes with some somewhat thickened but elongate (over 5 cm) roots; rhizome short, regenerated in part each year, only the oldest portion withering; basal lvs the largest, the blade at least as wide as long, mostly 3-lobed or trifoliolate, the acute or acuminate lobes or segments (especially the terminal one) variously incised, lobed, or merely toothed; pet 5-8(-10), widest above the middle, 8-14 נ3-10 mm, equaling or to twice as long as the sep; receptacle ±clavate or ellipsoid above the broad staminal zone; body of the achenes subrotund or obovate, 2-3.5 mm, the nerves bordering the marginal keel tending to be raised so that the margin is ±tricarinate, the keel sometimes winged; beak straight or nearly so, 1.8-3 mm; 2n=32, 64. N.S. and s. Que. to se. Sask., s. to Fla. and e. Tex. Apr., May. Three vars., with broadly overlapping ranges. Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp. ©The New York Botanical Garden. All rights reserved. Used by permission.
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