Ranunculus occidentalis |
Ranunculus austro-oreganus |
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western buttercup |
southern Oregon buttercup |
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Roots | never tuberous. |
never tuberous. |
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Stems | erect to reclining, not rooting nodally, hirsute or sometimes pilose or glabrous, base not bulbous. |
erect or ascending, never rooting nodally, crisped-pilose, base not bulbous. |
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Basal leaf blades | broadly ovate to semicircular or reniform in outline, 3-parted or -foliolate, 1.5-5.3 × 2.2-8 cm, segments usually again 1(-2)×-lobed, ultimate segments oblong or elliptic to lanceolate or oblanceolate, margins dentate (sometimes dentate-lobulate or entire), apex acute to rounded-obtuse. |
broadly rhombic to semicircular in outline, 3-parted, 2.8-4.3 × 3-5.5 cm, segments 3-lobed, ultimate segments lanceolate, margins entire or toothed, apex narrowly acute or acuminate. |
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Flowers | receptacle glabrous; sepals reflexed 2-3 mm above base, 4-7(-9) × 2-4 mm, hirsute; petals 5-14, yellow, 5-13 × 1.5-8 mm. |
receptacle glabrous; sepals reflexed 1 mm above base, 4-6 × 1.5-3 mm, densely pilose; petals 5, abaxially red, adaxially yellow, 10-12 × 4-6 mm. |
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Heads of achenes | hemispheric, 3-7 × 5-9 mm; achenes 2.6-3.6(-4.8) × 1.8-3(-3.2) mm, glabrous, rarely hispid, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lanceolate to lance-subulate, straight or curved, 0.4-2.2 mm. |
hemispheric, 4-7 × 7-10 mm; achenes 3.4-4.2 × 2.8-3.2 mm, sometimes basally pilose, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, lance-subulate, straight or somewhat curved distally, 1.6-2.6 mm. |
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Ranunculus occidentalis |
Ranunculus austro-oreganus |
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Phenology | Flowering spring (May). | |||||||||||||||||||||||||
Habitat | Grassy hillsides | |||||||||||||||||||||||||
Elevation | 500 m (1600 ft) | |||||||||||||||||||||||||
Distribution |
AK; CA; NV; OR; WA; AB; BC; YT
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OR |
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Discussion | Varieties 7 The seeds of Ranunculus occidentalis were eaten by some Californian Indians. D. E. Moerman (1986) identified this taxon as an Aleut poison: juice of the flowers could be slipped into food to poison the person who ate it. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Ranunculus austro-oreganus is doubtfully distinct from R. occidentalis var. howellii. L. D. Benson (1954) described the stem as bulbous-based and similar to that of R. bulbosus, but a differentiated base is not evident in material I have seen (some of which was cited by Benson). (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. Ranunculus | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | ||||||||||||||||||||||||
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Subordinate taxa | ||||||||||||||||||||||||||
Name authority | Nuttall: in J. Torrey & A. Gray, Fl. N. Amer. 1: 22. (1838) | L. D. Benson: Amer. Midl. Naturalist 52: 341. (1954) | ||||||||||||||||||||||||
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