Ranunculus orthorhynchus |
Ranunculus trilobus |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|
Bloomer's buttercup, straight-beak buttercup, swamp buttercup |
threelobe buttercup |
|||||||||
Roots | sometimes fleshy and ± tuberous. |
|||||||||
Stems | nearly erect or decumbent, never rooting nodally, hispid, strigose, or glabrous, base not bulbous. |
erect or reclining, hispid or sometimes glabrous. |
||||||||
Basal leaf | blades narrowly ovate to oblong or semicircular in outline, simple to 3-5-lobed or -foliolate, 2.8-12.5 × 2.5-14 cm, leaflets or segments undivided or 1-2x-lobed or -parted, ultimate segments circular to linear, margins dentate, crenate, or entire, apex rounded to narrowly acute. |
|||||||||
Flowers | receptacle hispid; sepals reflexed 1-2 mm above base, 5-11 × 2-4 mm, hispid, hirsute, or glabrous; petals 5-6, abaxially yellow or red, adaxially yellow, 8-18 × 4-11 mm. |
pedicellate; receptacle hispid; sepals 5, reflexed, 3-4 × 2 mm, sparsely hispid; petals 5, 4-5 × 2-3 mm. |
||||||||
Heads of achenes | hemispheric to ovoid, 5-13 × 6-10 mm; achenes 2.8-4.5 × 1.8-3.2 mm, glabrous, margin forming narrow rib 0.1-0.2 mm wide; beak persistent, narrowly lanceolate to subulate, straight, 1.8-3.8(-4.8) mm. |
ovoid, 8-9 × 6-7 mm; achenes 30-60 per head, 2 × 2 mm, faces densely tuberculate, glabrous, margin smooth; beak semicircular, hooked, 0.3 mm. |
||||||||
Basal | and lower cauline leaf blades cordate-ovate, 3-foliolate, 5-8 × 3-6(-7) cm, leaflets again cleft or parted, leaflet base obtuse to acute, margins dentate, apex rounded to acute. |
|||||||||
Ranunculus orthorhynchus |
Ranunculus trilobus |
|||||||||
Phenology | Flowering spring (Apr). | |||||||||
Habitat | Fields and roadsides | |||||||||
Elevation | 0-100 m (0-300 ft) | |||||||||
Distribution |
AK; CA; ID; MT; NV; OR; UT; WA; WY; BC
|
AL; FL; LA; SC; TX; native to Europe [Introduced in North America] |
||||||||
Discussion | Varieties 3 The first two varieties (Ranunculus orthorhynchus var. orthorhynchus and R. orthorhynchus var. platyphyllus) are rather weak, intergrading extensively in California and Oregon. By contrast, R. orthorhynchus var. bloomeri often grows with the others with little or no intergradation (although intermediate populations are found in some areas), and it has been treated as a distinct species, R. bloomeri, by many taxonomists. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|||||||||
Key |
|
|||||||||
Source | FNA vol. 3. | FNA vol. 3. | ||||||||
Parent taxa | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus | Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Echinella | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Name authority | Hooker: Fl. Bor.-Amer. 1: 21. (1829) | Desfontaines: Fl. Atlant. 1: 437. (1799) | ||||||||
Web links |
|