Ranunculus fascicularis |
Ranunculus platensis |
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early buttercup, early crowfoot, prairie buttercup, tuft buttercup |
prairie buttercup |
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Roots | always both filiform and tuberous on same stem. |
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Stems | erect or ascending, never rooting nodally, strigose or spreading-strigose, base not bulbous. |
decumbent, sparsely pilose. |
Basal leaf | blades ovate to broadly ovate in outline, 3-5-foliolate, 2.1-4.7 × 1.9-4.5 cm, leaflets undivided or 1x-lobed or -parted, ultimate segments oblanceolate or obovate, margins entire or with few teeth, apex rounded-acute to rounded-obtuse. |
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Flowers | receptacle hispid or glabrous; sepals spreading or sometimes reflexed from base, 5-7 × 2-3 mm, hispid or glabrous; petals 5(-7), yellow, 8-14 × 3-6 mm. |
sessile; receptacle glabrous or pilose; sepals 3, spreading, 1-2 × 0.5-1 mm, hirsute; petals 3, 1-2 × 0.5-0.8 mm. |
Heads of achenes | globose or ovoid, 5-9 × 5-8 mm; achenes 2-2.8 × 1.8-2.2 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, filiform, straight, 1.2-2.8 mm. |
hemispheric, 2-2.5 × 3-3.5 mm; achenes 10-15 per head, 1.3-1.7 × 1-1.3 mm, faces and proximal margin finely papillate, each papilla crowned with hooked bristle, otherwise glabrous; beak semicircular to deltate, curved, 0.2-0.5 mm. |
Basal | and lower cauline leaf blades reniform, 3-parted, 0.8-1.7 × 1.2-2 cm, segment base cordate, margins dentate or lobulate, apex rounded-obtuse. |
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2n | = 32. |
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Ranunculus fascicularis |
Ranunculus platensis |
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Phenology | Flowering winter–spring (Jan–Jun). | Flowering winter–spring (Feb–Apr). |
Habitat | Grassland or deciduous forest | Weed in disturbed areas, usually near coast |
Elevation | 0-300 m (0-1000 ft) | 0-200 m (0-700 ft) |
Distribution |
AL; AR; CT; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WI; MB; ON
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AL; FL; GA; LA; MS; NC; TX; native to South America (s Brazil, Uruguay, and Argentina) [Introduced in North America]
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Discussion | Ranunculus fascicularis is very similar to R. hispidus var. hispidus, and herbarium specimens without underground parts may be difficult to identify. Ranunculus fascicularis grows in drier habitats; segments of its leaves are commonly oblanceolate and blunt, with few or no marginal teeth; and its petals are widest at or below the middle. Ranunculus hispidus var. hispidus is usually larger in all its parts (leaves, flowers, heads of achenes); leaf segments are variable in shape but their apices are normally sharper and their marginal teeth more numerous, and petals are widest above the middle. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 3. | FNA vol. 3. |
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella |
Sibling taxa | ||
Synonyms | R. fascicularis var. apricus | |
Name authority | Muhlenberg ex J. M. Bigelow: Fl. Boston., 137. (1814) | A. Sprengel: in K. Sprengel, Syst. Veg. 5: 586. (1828) |
Web links |