39). 
15. Perigynia sharply triangular in 
cross-section; plant pubescent. 
Expected (Triquetrae). 
14. Achenes not closely enveloped by the per- 
igynia or, if so, the bracts strongly 
sheathing. 
16. Beak of perigynium strongly bidentate; 
leaves septate-nodulose. Expected (Hirtae). 
16. Beak of perigynium at most shallowly 
bidentate; leaves not septate-nodulose. 
17. Bracts long-sheathing, or at least 
thesilowersoness soe. sa. Geeee.ce ee | Laxitloraes (ps) 66) 
17. Bracts sheathless or the lower ones 
short—sheathing. scac.scersecnsscs Nirescentesy (ps 00) 
12. Perigynia and foliage glabrous. 
18. Style not articulated, continuous with the 
achene, persistent, indurated. 
19. Perigynia subcoriaceous, firm. Expected 
(Paludosae). 
19. Perigynia membranaceous. 
20. Perigynia obconic or broadly obovoid, 
truncately contracted into long, 
subuilatet beakea: «sche meeeiieee ces sce, Sqlarrosaegcps 61) 
20. Perigynia lanceolate to ovoid or globose- 
ovoid, not truncately contracted. 
21. Perigynia lanceolate or ovoid- 
lanceolate, tapering into the beak. 
Expected (Lupulinae, Collinsiae, 
Folliculatae). 
21. Perigynia broader, abruptly con- 
tracted into the beak, usually 
strongly ribbed. 
22. Perigynia finely and closely 
ribbed. Expected (Pseudo-cyperi). 
22. Perigynia coarsely ribbed. 
