1.Rhizome dimorphic: short and thick (nodulose), and long and thin; sepals 5--12.
根状茎二形：短和厚(具节)和和薄；萼片5--12.(16
2.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.
节)和
和薄；萼片5--12.(16
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