Juncaceae

Flowers in cymes or in dense lateral clusters Juncaceae

Leaf sheaths open; seeds numerous Juncus

Leaves terete (sometimes compressed) or reduced to sheaths with the lamina as a small acute tip to the sheaths

Lamina reduced to an acute or mucronate tip on the sheaths

Pith of the culm continuous throughout

Pith interrupted by transverse spaces at least in part of the culm