Description
Key Characters:
Growth Form:
Annual or perennial herbs with fibrous or tuberous roots.
Stems:
Stems erect, procumbent, or stoloniferous and rooting adventitiously at the nodes.
Roots:
Fibrous root system.
Leaves:
Leaves simple and/or compound. Basal leaves simple and ternately lobed or parted, or compound (ternate or rarely pinnate); cauline leaves simple and ternately lobed, parted, or compound.
Alternate.
Margins entire or serrate (Cauline leaves).
Petiolate.
Stipules absent (usually) or present (rarely).
Flowers:
Flowers 1 to several in cymose inflorescences.
Flowers bisexual (perfect), actinomorphic.
Calyx of 3–5 sepals, rarely more, herbaceous or petaloid, spreading or reflexed, caducous, distinct.
Corolla of 5–20 petals; petals yellow and glossy or white and mat in the upper ⅔, rarely reddish or green, distinct.
Stamens (5–)numerous; anthers dithecal, opening by a longitudinal slit.
Ovary superior; carpels numerous, each 1-celled.
Fruit:
Achenes turgid or flattened; the surface smooth; papillate; striate; echinate; or with transverse ridges; glabrous or pubescent; tipped with a fibrous or stout stylar beak.
Seeds with a copious endosperm and small embryo.
Ploidy:
Habitat:
Elevation Range: