Ranunculus setaceus Rodway

Shortly rhizomatous perennial; roots fibrous or fleshy, not tuberous. Leaf rosettes usually crowded. Leaves with lamina narrowly linear, 3–6 cm long, c. 1 mm wide, distally terete or flattened, simple or trifurcate with narrowly linear segments each with an apical or subapical hydathode, glabrous or with a few scattered hairs. Flowering stems 1-flowered, shorter than leaves, recurved when fruiting. Sepals 5, ± glabrous, caducous. Petals 5, cream to pale greenish yellow, narrowly lanceolate to narrowly elliptic, 5–6.5 mm long; nectary c. 0.7–2.0 mm above petal-base, a lobeless semilunar pit. Stamens 10–15. Pistils 10–15. Receptacle sparsely hairy throughout. Achenes lenticular, obovate to semiorbicular, 3–4.5 mm long, smooth; beak short, recurved.

Grows in bogs and depressions subject to intermittent flooding and in small streams; 1100–1400 m alt.