Rhizome dimorphic: short and thick (nodulose), and long and thin; sepals 5--12.
根状茎二形：短和厚(具小
)和
和薄；萼片5--12.(16
；有小瘤Rhizome dimorphic: short and thick (nodulose), and long and thin; sepals 5--12.
根状茎二形：短和厚(具小)和和薄；萼片5--12.(16
Rhizome long and thin or shortly nodulose; leaf blade ternate, petiole narrow; involucral bracts petiolate; pistils and achenes with distinct style and small, usually linear stigma.
根状茎和薄或具短小；三出叶片，狭窄叶柄；总苞片具叶柄；雌蕊和瘦果具明显花
和小，通常线形
。(8
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