Ranunculus flammula |
Ranunculus micranthus |
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creeping buttercup, creeping crowfoot, creeping spearwort, greater creeping spearwort, lesser spearwort, lesser water buttercup, spearwort |
rock buttercup, small-flower crowfoot |
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Roots | not thickened basally, glabrous. |
dimorphic, some filiform, 0.2-0.6 mm thick and some with tuberous bases 1-2 mm thick. |
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Stems | erect to prostrate, usually rooting nodally, glabrous or sparsely strigose. |
erect, 11-40 cm, villous, each with 8-35 flowers. |
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Basal leaves | persistent, blades ovate, orbiculate, or transversely elliptic, outer blades undivided, inner 3-parted or 3-foliolate, 1-3.3 × 1-3 cm, base truncate to broadly obtuse or sometimes weakly cordate, margins crenate, apex rounded-obtuse. |
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Proximal cauline leaf blades | lanceolate to oblanceolate or filiform, 0.7-6.5 × 0.04-1 cm, base acute to filiform, margins entire or serrulate, apex acute to filiform. |
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Inflorescences | bracts lanceolate to oblanceolate. |
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Flowers | receptacle glabrous; sepals 5, spreading or weakly reflexed, 1.5-4 × 1-2 mm, glabrous or appressed-hispid; petals 5-6, 2.5-7 × 1-4 mm; nectary scales glabrous. |
pedicels glabrous or villous; receptacle glabrous; sepals 2-4 × 1-1.5 mm, abaxially glabrous or pubescent, hairs colorless; petals 5, 1.5-3.5 × 0.5-1.5 mm; nectary scale glabrous. |
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Heads of achenes | globose or hemispheric, 2-4 × 3-4 mm; achenes 1.2-1.6 × 1-1.4 mm, glabrous; beak lanceolate to linear, straight or curved, 0.1-0.6 mm. |
globose to cylindric, 3-7 × 2-4 mm; achenes 1.1-1.5 × 1-1.3 mm, glabrous; beak subulate, straight or curved, 0.2-0.3 mm. |
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2n | = 16. |
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Ranunculus flammula |
Ranunculus micranthus |
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Phenology | Flowering spring (Mar–May). | |||||||||
Habitat | Woods, meadows, and clearings | |||||||||
Elevation | 0-1000 m (0-3300 ft) | |||||||||
Distribution |
AK; AZ; CA; CO; CT; ID; MA; ME; MI; MN; MT; ND; NH; NJ; NM; NV; NY; OR; PA; UT; VT; WA; WI; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Eurasia
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AL; AR; CT; DC; IL; IN; KS; KY; MA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SD; TN; VA; WV
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Discussion | Varieties 3 (3 in the flora). In Eurasia, this taxon is usually treated as two closely related species. Ranunculus flammula in the strict sense has relatively stout (0.8-3 mm thick) stems that are erect or ascending from prostrate bases, lanceolate to oblanceolate leaves 3-10 mm broad, sepals 3-4 mm, and petals 5-7 × 3-4 mm. Ranunculus reptans has slender (0.2-1 mm thick) stems that are usually prostrate except for the pedicels, leaves linear or filiform, to 2 mm broad, sepals 1-2 mm, and petals 3-5 × 1-2.5 mm. In North America, this distinction holds up relatively well east of the Great Plains, where plants with the characteristics of R. flammula in the strict sense are found in eastern Canada (Newfoundland and northern Nova Scotia) while plants with the characteristics of R. reptans are widespread. In the western part of the continent, however, the situation is much less clear. Collections from the Great Plains and Rocky Mountains resemble R. reptans in most characters, but they often have broader leaves (up to 5 mm broad). Plants from farther west are very confusing; specimens showing the typical morphology of R. flammula in the strict sense and R. reptans are found over a wide area, but most specimens from this area combine the characteristics of the two taxa in various ways. For this reason, it is not possible to separate these taxa at the species level. Three varieties are usually recognized, but further study will probably alter the varietal classification (see comments below, under R. flammula var. ovalis). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 3. | FNA vol. 3. | ||||||||
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Flammula | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Epirotes | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | R. micranthus var. cymbalistes, R. micranthus var. delitescens | |||||||||
Name authority | Linnaeus: Sp. Pl. 1: 548. (1753) | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 18. (1838) | ||||||||
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