Flora of North America species comparison

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Ranunculus occidentalis var. occidentalis
Photo is of parent taxon

western buttercup
Stems

erect to reclining, 1-3(-4) mm thick, hirsute or sometimes glabrous.
Basal leaf blades

3-parted or -foliolate, ultimate segments oblong or elliptic to lanceolate or oblanceolate, margins dentate or dentate-lobulate.
Flowers

sepals 5, 4-7 mm;

petals 5-6, 5-10 × 3-6 mm.
Achenes

2.6-3.6(-4) × 1.8-3(-3.2) mm, glabrous or hispid;

beak lanceolate, curved, (0.6-)1-1.4 mm.

Ranunculus occidentalis var. occidentalis
Phenology Flowering late winter–spring (Mar–Jun).
Habitat Grassy slopes of meadows or open woodlands
Elevation 0-1500 m (0-4900 ft)
Distribution
from FNA
CA; NV; OR; WA; BC
[BONAP county map]
Discussion

L. D. Benson (1948) divided Ranunculus occidentalis var. occidentalis into three varieties. The name R. occidentalis var. occidentalis was applied only to plants from Oregon northward, in which leaves are rarely compound and never have lanceolate ultimate segments, and achenes are always glabrous and have beaks over 1 mm. California plants were treated as R. occidentalis var. rattanii (plants with small [5-8 mm] petals from the Coast Ranges) and R. occidentalis var. eisenii (plants with larger petals from the foothills surrounding the Central Valley). Most of those plants from California, however, cannot be distinguished from more northern plants, and forms with small petals are found throughout the range of the variety.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3.
Parent taxa Ranunculaceae > Ranunculus > subg. Ranunculus > sect. Ranunculus > Ranunculus occidentalis
Sibling taxa
R. occidentalis var. brevistylis, R. occidentalis var. dissectus, R. occidentalis var. hexasepalus, R. occidentalis var. howellii, R. occidentalis var. nelsonii, R. occidentalis var. ultramontanus
Synonyms R. occidentalis var. eisenii, R. occidentalis var. rattanii
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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