8.
Ranunculus acriformis
A. Gray, Proc. Amer. Acad. Arts. 21: 374. 1886.
Stems erect, not rooting nodally, hirsute or strigose, base not bulbous. Roots never tuberous, sometimes thick and ± fleshy proximally. Basal leaf blades broadly ovate to cordate or sometimes reniform in outline, deeply 3-divided or occasionally 3-foliolate, 2.2-6 × 2.5-7.7(-10) cm, divisions 1-2× deeply parted or -dissected, ultimate segments linear to broadly linear, margins entire (occasionally a lobe reduced to large tooth), apex acute or rounded-acute. Flowers: receptacle glabrous; sepals spreading or variously reflexed, 4-6 × 2-4 mm, appressed-hirsute; petals 5(-10), yellow, 7-13 × 4-10 mm. Heads of achenes hemispheric or globose, 5-8 × 6-8(-10) mm; achenes 2.2-3.4 × 2-3 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lanceolate, strongly curved, 0.4-1.6 mm.
Varieties 3: w North America.
