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Annual or perennial herbs with branching leafy stems. Leaves alternate, 2–4-pinnate with narrowly linear segments. Peduncle without bracts. Flowers bisexual, actinomorphic, usually solitary, terminal. Perianth segments not spurred. Sepals 5 (rarely to 8), appressed or spreading, glabrous or pilose, sometimes petaloid and/or caducous. Petals 3–20, intensely coloured, glossy, yellow or red, without claw or nectaries. Stamens numerous. Achenes numerous, transversely veined and rugose, glabrous or hairy, at maturity forming an elongated head. Fruiting receptacle cylindrically elongated or conical.
Herbs annual or perennial. Basal and lower stem leaves usually scaly. Upper stem leaves alternate, palmately or pinnately divided. Inflorescences terminal on branches or branchlets, 1-flowered; bracts absent. Flowers radially symmetric, bisexual. Sepals 5--8. Petals 5--24. Stamens numerous; filaments linear. Pistils numerous, spirally arranged; ovary 1-ovuled. Styles persistent; stigma small. Achenes usually with raised veins.
Much like Ranunculus, but without the nectariferous scale or pit at the base of the pet; cauline lvs alternate, sessile or nearly so, dissected into numerous narrowly linear segments; fls solitary, terminating the stem or its branches; sep 5, green, shorter than the 5–20 conspicuous pet; ovule and seed suspended. 20, temp. Eurasia.
