[+] 2. Ovales. Spikes tawny or dark, rather large, sometimes crowded; perigynium with a more or less thin or winged margin, which is mostly incurved at maturity, rendering the perigynium concave inside.—Sp. 125–132.
[+] 3. Cyperoideæ. Spikes green, oblong, densely crowded into a short head subtended by two or three leafy bracts which are erect and prolonged from six inches to a foot; perigynium linear-lanceolate, scarcely margined.—Sp. 133.
Artificial Key.
Spike 1, staminate at top; scales of pistillate flowers leaf-like Sp. 93–95
Spike 1, scales not leaf-like.
Usually diœcious, stigma 2 115–117
Stigmas 3.—
Perigynium densely hairy 84
Spike staminate at base; perigynia squarrose 21
Spike staminate at top.—