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 well developed, terete or ± compressed
Leaves not jointed with internal septa, stiff and hard; plants robust; inflorescence apparently lateral
Leaves jointed with internal septa (incompletely so in J. prismatocarpus); inflorescence rather loose, apparently terminal, with distinct clusters of flowers or individual flowers