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.

• 根状茎长和薄的或具短的小节；三出的叶片，狭窄的叶柄；总苞片具叶柄；雌蕊和瘦果具明显花柱和小，通常线形柱头。(8