Baumea Gaudich.
Nut surmounted by the thickened stylar base scarcely half as long as the body or almost obsolete. Lowermost flower perfect Baumea
Either leaves 4-angled or flat and 1–4 mm wide
Leaves flattened, striate but with raised midribs, up to 150 cm long
Leaves and culms scabrous. Leaf sheaths brown, red-brown or black
Glumes <4 mm long. Leaves to 6 mm wide, with brown sheaths, midrib strongly raised. Inflorescence to 14 cm long. Nut pale to dark brown, 1.5–2 mm long. Blue Mts Swamps and streams. Sandy soil Baumea planifolia
Glume >6 mm long. Leaves 2–3 mm wide, with reddish sheaths, without a raised midrib. Inflorescence up to 50 cm long. Nut red-brown to black, 2.5–3.5 mm long, with a short stalk. Blue Mts Damp, sheltered situations Baumea johnsonii