Ann. Bot. (Usteri) 1(3): 15. 1792.

Etymology: For Johann Jakob Roemer, 1763-1819, Swiss physician and naturalist at Zürich
Treatment appears in FNA Volume 3.

Herbs, annual, caulescent; sap yellow. Stems leafy. Leaves: basal usually few, rosulate, indistinctly petiolate; cauline usually few and remote, alternate, proximal indistinctly petiolate, distal sessile; blade 2-3× pinnately lobed. Inflorescences axillary and terminal, 1-flowered; bracts present. Flowers: sepals 2, distinct; petals 4; stamens many; pistil 2-4(-6)-carpellate; ovary 1-locular; style absent or obscure; stigmas 2-4(-6), radiate. Capsules slenderly cylindric or terete, 2-4(-6)-valved, dehiscing from apex almost to base; peduncle straight or often recurved. Seeds many, aril absent.


North America, s Europe, sw, sc Asia.


Species 3-5 (1 in the flora).

Selected References


Lower Taxa