Key to the sections

1Leaf-sheath elongated, extending along the petiole for about 1/4 of its length (Spp. 1-7)
1'Leaf-sheath short or obsolete, restricted to the base of the petiole.
2Style arms spreading, at least in fruit.
2'Style arms erect, fused, forming a beak in fruit.
3Flowers arranged racemosely (Sp. 8)
3'Flowers arranged in umbellules or capitula (Spp. 9-14)
4Inflorescence large, +- as long as the leaves (Spp. 15-19)
4'Inflorescence much shorter than the leaves (Spp. 20-23)