58. 
9. Perigynia plano-convex, thin, 
yellowish; bracts mostly much 
exceeding the spikes; leaf- 
sheaths usually transversely 
rugose ventrally... ..tideadsecen. Mulbitloracmaps 10) 
9. Perigynia thick-plano-convex 
or unequally biconvex, brown; 
bracts mostly shorter than the 
spikes; leaf-sheaths not 
transversely rugose. Expected 
(Paniculatae). 
6. Spikes with pistillate flowers above, 
staminate ones below. 
10. Perigynia with winged margins......... Ovales (p. 65) 
10. Perigynia without winged margins, 
at most thin-edged. Expected 
(Stellulatae, Deweyanae, Heleonastes). 
4, Lateral spikes peduncled or, if sessile, elongate; 
terminal spike usually staminate, 
11. Achenes constricted in the middle; scales 
3—nerved iliong—awned Toes cccseresececoleeess CLYPLOCarpae (p. 66) 
11. Achenes not constricted in the middle; 
scales 1l-nerved, not long-awned. Expected 
(Acutae). 
3. Stigmas three; achenes trigonous. 
12, Perigynia or foliage pubescent. 
13. Style continuous with the achene, persistent, 
indurated. Expected (Paludosae). 
13. Style articulated with the achene, at 
length deciduous. 
14. Achenes closely enveloped by the 
perigynia; bracts sheathless or 
nearly so. 
15, Perigynia obtusely triangular or 
orbicular-triangular in cross- 
section; plant (except perigynia) 
elabrousecmente Voi eare steels Suiceaton ... Montanae (p- 66) 
