Ranunculus austro-oreganus
southern Oregon buttercup
never tuberous.
erect or ascending, never rooting nodally, crisped-pilose, base not bulbous.
blades 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.
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.
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.
Ranunculus austro-oreganus
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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