| General Information |
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| Distribution | A genus of about 400 species of temperate, cold, and tropical montane regions.
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Habit
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Annual or perennial herbs with fibrous or tuberous roots; stems erect, procumbent, or stoloniferous and rooting adventitiously at the nodes.
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Leaves
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Basal leaves simple and ternately lobed or parted, or ternately compound, rarely pinnately compound, margins entire or serrate; cauline leaves simple and ternately lobed or parted, or compound, alternate, margins entire or serrate.
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Flowers
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Flowers 1 to several in cymose inflorescences; receptacle globose, ovoid, or cylindrical; sepals 3-5, rarely more, herbaceous or petaloid, spreading or reflexed, caducous; petals 5-20, yellow and glossy or white and mat in the upper 2/3, rarely reddish or green, each with a single nectary at the base of the short claw, the nectary covered by a flap or naked; stamens (5-)numerous; carpels numerous.
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Fruit
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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.
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