62 CVrERACKAE. 



1. Peripj'iiia conijjrcsscd ; scales very dark. 



Spikes all Kynaccaiulroiis or the lateral pistillate ; stigmata 3 (except some- 

 times in C. inisaiuira). 

 Spikes all ij>'naecandrous. ij. Mklanaxthak. 



Lateral spikes pistillate. 



Spikes sessile or nearly so. 12. Micr.ANANTiiAE. 



Spikes long-peduncled. 18. Stknocarpae. 



Terminal spike staminate, the lateral pistillate or the uppermost of these 

 staminate or androgynous. 

 Stigmata 3 ; spikes oblong. 35. C. Kaynoldsii. 



Stigmata 2; spikes cylindrical. 13. Microrii ynciiak. 



2. Perigynia turgid. 



Spikes 2-4, all gynaecandrous, dark brown ; perigynia gibbous, papillose. 



14. AiCOKASTAI IIVAE. 



Spikes several ; the terminal and sometimes the uppermost of the lateral 

 ones staminate : the rest pistillate or in C. Backii all androgynous. 

 Perigynia glabrous ; spikes peduncled. 



Beak short or none ; spikes erect, loosely flowered ; perigynia nerved. 



15. Cenciirocarpak. 

 Beak prominent, bifid or bidentate. 



Spikes not very densely flowered, drooping : perigynia faintly nerved, 

 erect or slightly spreading. 23. Hymenochlaenae. 



Spikes densely flowered, erect ; perigynia nerved, squarose at ma- 

 turity. 24. Spirostachvae. 

 Perigynia pubescent. 



Pistillate spikes few-flowered, roundish ; perigynia obovate to globose, 

 obscurely nerved : bracts foliaceous but sheathless. 



21. Sphaeridiophorae. 

 Pistillate spikes cylindric, dense-flowered ; perigynia ovate or ovate- 

 lanceolate, nerved ; bracts sheathing. 22. Trichocarpae. 

 II. Perigynia inflated and tapering into a long beak. 



Perigynia abruptly contracted into a very long, slender beak. 



66. C. loiigirostris. 

 Perigynia gradually tapering into the beak. 



Perigynia, at least the lower, reflexed at maturity, sessile ; bracts sheathing. 



25. Echinostachyae. 

 Perigynia not reflexed. 



Bracts sheathless ; perigynia sessile. 26. Physocarpae. 



Bracts sheathing; perigynia stipitate. 27. Rhynchopiiorae. 



I. VIGNEAE. Stigmata 2. Spikes all or nearly all bisexual or dioecious, 



sessile. 



I. Braciiystachyae. 



Spikes several, short and fevi^-flowered, sessile, remote, light-green; scales 

 hyaline ; perigynium erect, several-nerved, spongious at the base. 



Spikes gynaecandrous (i. e., pistillate above, staminate below) ; bracts inconspic- 

 uous ; perigynium light-green, ovate, tapering into a short, almost entire beak. 



1. C. caiiescens. 

 Spikes androgynous (j. e., staminate above, pistillate below) ; bracts narrow, but 



conspicuous ; perigynium shining reddish-brown, abruptly-beaked. 



2. C. tenella. 

 2. Neurochlaenae. 



Spike single, androgynous, shining reddish-brown; perigynium erect, ob- 

 long, faintly nerved, scabrous along the short hyaline beak, with the orifice 

 slit on the convex face. 

 One species. 3- C. nardina. 



