Herbs , perennial, from thick caudices 0.5-2 cm or slender stolons. Leaves basal and cauline, simple; proximal leaves petiolate, distal leaves sessile or nearly so; cauline leaves alternate. Leaf blade unlobed, oblong-ovate to orbiculate-reniform or cordate, margins entire, dentate, or crenate. Inflorescences terminal or axillary, 1-6-flowered cymes or flowers solitary, to 22 cm; bracts leaflike, not forming involucre. Flowers bisexual, radially symmetric; sepals not persistent in fruit, 5-12, white, pinkish, yellow, or orange, plane, oval-orbiculate to narrowly obovate, 4-23 mm; petals absent; stamens 10-40; filaments filiform; staminodes absent between stamens and pistils; pistils 5-55, simple; ovules 15-35 per pistil; style 0.1-2 mm. Fruits follicles, aggregate, sessile or stipitate, linear-oblong to ellipsoid, sides prominently veined or not; beak terminal, straight or weakly curved, 0.2-2 mm. Seeds brown, elliptic to broadly elliptic, rugulose. x =8.
Herbs perennial, glabrous, with fibrous roots. Stems simple or several branched. Leaves basal, or both basal and cauline, sometimes distal cauline ones palmately lobed, orbicular, reniform, or ovate, base cordate, margin dentate or entire; petioles sheathed at base. Flower solitary, terminal, or 2 or more in a simple or complex monochasium opening nearly flat. Sepals 5 or more, petaloid, yellow, rarely white or red, obovate or elliptic, caducous. Petals absent. Stamens numerous; anthers elliptic to oblong; filaments linear. Follicles 5--40, sessile, sometimes stipitate, with branching transverse veins, styles distinct or nearly absent; ovules several to many. Seeds several in a follicle, ellipsoid-globose, smooth.
"Sep 5–9, petaloid; pet none; stamens many; staminodes none; pistils 4–many, the style very short; follicles compressed to subterete; low perennial poisonous herbs of wet places, with alternate, petiolate, entire or merely toothed lvs and peduncled, axillary or terminal fls. 15, circumboreal."
|Marsh-marigold, populage [Greek name for some yellow-flowered plants]|