CYPERACEAE. 67 



Pistillate spikelets loosely few- flowered, 

 green. 

 Stigmas 2. 7. C. hassei. 



Stigmas 3. 8. C. triquetra. 



Spikelets androgynous, the staminate flowers at 

 the summit or base or intermingled. 

 Spikelet solitary, the pistillate flowers 2-6, 



loosely disposed. _ 9. C. muUicaulis. 



Spikelets several, sessile, and more or less 

 aggregated in heads. 

 Staminate flowers at the summit of the 

 spikelets. 

 Heads elongated, interrupted, panicu- 



lately decompound. 10. C. alma. 



Heads ovoid or narrow, spikelets 

 simple. 

 Rhizomes black. 11. C. marcida. 



Rhizomes scaly and brown. 



Heads ovoid, congested. 12. C. hernardina. 



Heads narrow, spikelets separ- 

 ated. 13. C. hookeriana. 

 Staminate flowers usually at the base of 



the spikelets. 14. C. siccata. 



1. C. comosa Boott. Stems stout, 4-6 dm. high, angles sharp 

 and scabrous; leaves rigid, nodose, 5-10 mm. wide, long, tapering; 

 spikelets 4-6, densely flow^ered, the uppermost staminate, linear, 

 25-80 mm. long; pistillate spikelets 4-7 cm. long, 8-15 mm. wide, 

 cylindric, approximate or the lowest remote; scales pale, attenuate 

 to a long hispid point, lanceolate or oblong, those of the staminate 

 linear-lanceolate; perigynium coriaceous, pale olive, ovate to lance- 

 olate, attenuate to a long beak; beak bidentate, the teeth about 

 2 mm. long; nutlet obovoid, chestnut colored. (C. Pseudo- Cyperus 

 comosa Boott.) 



Canyon near Burbank, Davidson; San Bernardino, Parish. 



2. C. lanuginosa Michx. Stems 3-8 dm. high, stoloniferous; 

 leaves often exceeding the stems, 2-4 mm. wide, spikelets 3-4, 

 purple, staminate 1-4, linear, 3-5 cm. long, more or less pedicelled, 

 the lower sessile; pistillate 2-4, oblong or cylindric, 2-5 cm. long, 

 6-8 mm. wide, densely flowered, remote, sessile or the lowest pedi- 

 celled; pedicels scabrous; scales purple, pale in the middle, acute, 

 ciliate at the apex; perigynium coriaceous, hispid, ovoid, obtusely 

 angled, olive-colored; beak short, with short divergent scabrous 

 teeth, broader and usually shorter than the scales. 



Occasional in fresh-water marshes in the coast valleys, Davidson. 



3. C. spissa Bailey. Stems stout, 1-2 m. high, smooth or nearly 

 so; leaves numerous, rigid, glaucous, serrate, about equaling the 

 stem, 10-15 mm. wide; lower bract long, leaf-like, the uppermost 

 short or nearly obsolete; spikelets 6-12 or more, the lowest 10-15 

 cm. long, long-pedicelled, the upper becoming sessile, all erect, 

 cylindric; staminate 4-6 or more, 3-10 cm. long; scales with a stout 



