Description
Key Characters:
Growth Form:
Stoloniferous and rhizomatous perennial herbs.
Stems:
Stems prostrate or weakly erect, 1–9 dm long, sparsely to densely hirsute.
Roots:
If stem prostrate roots at least at the lower nodes.
Leaves:
Leaves compound (ternate)(Basal).
Cauline Alternate.
Leaflets broadly ovate, leaflets 1.5–8 cm long and wide.
Surfaces sparsely to moderately appressed pubescent.
Margins deeply lobed or divided and toothed; cauline leaves margins entire or serrate.
Petiolate.
Stipules absent or minute.
Flowers:
Flowers few in cymes.
Flowers bisexual (perfect), actinomorphic.
Calyx of 5 sepals, green or purple–tinged, lanceolate, 5–8 mm long, spreading or erect.
Corolla of 5–7 petals; petals yellow, obovate–cuneate, 5–13 mm long, base with a truncate nectary scale.
Stamens (5–)numerous; anthers dithecal, opening by a longitudinal slit.
Ovary superior; carpels numerous, each 1-celled.
Fruit:
Achenes 20–25 in a subglobose head; obovoid; 2.5–3 mm long; margined; the faces smooth; beak ca. 1 mm long; tapering from a broad base; recurved.
Seeds with a copious endosperm and small embryo.
Ploidy:
2n = 12; 14; 16; 18; 20; 24; 28; 32
Habitat:
Fields and pastures; sometimes in disturbed wet forest along streams.
Elevation Range:
600–1,460 m.