Ranunculus buchananii Hook.f.
Tufted perennial; rhizome stout. Stem erect, with silky hairs or almost glabrous, 20-30 cm tall. Lvs 1-2-ternate, fleshy, glaucous, 10-20 cm diam., with silky hairs; lobes toothed or divided. Fls 1-3 per stem, 4-6 cm diam.; pedicels hairy. Sepals spreading, hairy. Petals 15-25, white, linear-oblong; nectary single, 1-2-(4) mm from petal base, naked. Receptacle hairy. Achenes very numerous, not flattened, hairy; body 2-3 mm long; beak straight or curved, 4-6 mm long.
S.: S. Canterbury (Fyfe Pass), S. Westland, Otago, Fiordland.
Endemic.
Stable debris, rock ledges, and crevices, kept moist by meltwater from snow and ice fields, (1050)-1500-2300 m.
Fisher (1965, op. cit.) gives details of variation, a fuller description and illustrations.