CXLVI. CYPEEACB^. 



855 



Spikelets spicate. 

 Leaves more than 1 ft. long. 



Glumes remote ; nut nearly as long 



as the glume 29. C. mitans. 



Glumes not remote ; nut ^ as long as 

 the glume ; bracts never divaricate ; 



no true stolons 30. C. eleusinoides. 



Leaves not more than 6 in. long 31. C. malaccensis. 



Eihachilla of spikelets distinctly winged. 

 Leaves short, rarely ^ as long as the stem. 

 Glumes approximate ; stolons long, stout. 

 Spikelets pale straw-colored ; bracts very 

 short, rarely half as long as the umbel- 

 rays ; stem not articulate when dry ... 32. C. tegetiformis. 

 Spikelets rusty-brown ; bracts more than 

 half as long as the umbel-rays; stem more 



or less articulate when dry 33. C. corymbosus. 



Glumes remote, in fruit scarcely imbricating; 



stolons 34. C. tegetum. 



Leaves long, more than half as long as the 

 stem or longer. 



Ehlzome stoloniferous. 



Leaves arising from the stem at some 

 distance above the base and below its 



middle ; stems 4-12 in. long 35. C. bulbosics. 



Leaves radical. 



Stolons 4-8 in. long, bearing hard 

 black fragrant tubers ; stems 4- 



30 in. long 36. C. roitmdus. 



Stolons not or rarely tuberiferous ; 



stems 2-4 ft. long 37. C. tuberosus. 



Rhizome not stoloniferous. 



Spikelets much compressed, ascending ; 



wings persistent 38. C. exalfatus. 



Spikelets terete, spreading horizontally ; 



wings deciduous 39. C. digitatus. 



Bhachilla of spikelets disarticulating above the 

 2 lowest glumes. 



Stems less than 1 ft. long; spikelets bearing 



1 nut 40. C. Clarkei. 



Stems much more than 1 ft. long. 



Spikelets distant along the rhachis, bearing 

 1-2 nuts ; margins of glumes not hyaline ; 

 nut oblong, not curved, ^ in. long, pale- 

 brown; style more than ^ as long as the 



nut ; rhizome not stoloniferous 41. C. konkanensis. 



Spikelets closely packed along the rhachis. 

 Spikelets bearing 1 nut ; margins of 

 glumes hyaline; nutgiu. long, oblong, 

 curved, pale-brown ; style not ^ the 

 length of the nut ; rhizome stolo- 

 niferous 42. C. jMniceus v&r. 



Spikelets bearing 3-6 nuts; nut yV iti- [lioxburghiatia. 



long, ellipsoid, not curved, black ; 

 margins of glumes hyaline; style 

 more than ^ as long as the nut ; 



rhizome stoloniferous 43. C. pennatus. 



Spikelets bearing 4-14 nuts ; margins 

 of glumes not hyaline ; rhachilla 

 with oblong persistent wings 44. C. dilutus. 



1. Cyperus latespicatus, Boeck. in Flora, v. 42, p. 433 (of no. 28, 

 July 1859, uot ol: no. 27). Usually annual; rhizome not creeping; 



