Cyperus. 



CLVI. CYPERACE^ (cLARKE). 



Bracts much longer than the umbel, 3-iierved. 

 Spikelets linear-oblong or linear; with (usually) 

 more than 6 nuts. 

 Spikelets in fruit green; nut nearly as Ion? 



as tlie glume 57. C diffusns. 



Spikelets in fruit reddish or brownish (8 

 species very closely allied). 

 Spikelets ^.y-^ in, wide. 



Glumes closely packed, hardlymucronate. 

 Nut ovoid. 



Spikelets compressed ; glumes rather 



i-igid 



Spikelets turgid ; glumes soft 

 Nut oblong ..... 

 Glumes in fiuit hardly overlapping, with 

 a small mucro. 

 Bracts ^ in. wide .... 

 Bracts ^—1 in. wide .... 

 Spikelets i^g-|\,- in. wide. 



Spikelets short-oblong ; umbel rigid . 59. C. Baroni. 



Spikelets linear-oblong ; umbel fiexuose. 

 Leaves \\n. broad .... 58. 

 Leaves ^-f in. broad . . .60. 



Spikelets short oblong, with (usually) 3—4 nuts . 61. 

 Bracts not (or scarcely) overtopping the umbel, 

 1 -nerved ...... 



55. 

 56. 



C. Man nil. 

 Cfischerianus. 

 C. Deckeuii. 



C. derreilema. 

 C. Ajax. 



C. glaMcophyUus. 

 C. Zambesi ensii. 

 C. Renschii. 



. 62. C. aiireobrinieus. 



B. Cboristacbys. — Spikelets spicate. 



a. SuBEXALAT.T^. — Rliacliilla not or scarcely 

 <>xcept in 72, C. socialis. 



§ X. Compress-t:. — Annuals ; but sometimes persisting 

 year. 



Nut nearly as long as the glume . . . . 



Nut ^-'i the length of the glume. 

 Glumes obtuse, scarcely apiculate. 



Spikelets i^g-f^ i". broad . . . . 



Spikelets ^-^ in. broad . . . . . 



Glumes a( ute, mucronate or aristate. 



Spikelets ^-\ in. broad . . . . 



Spikelets |— ^ in. broad . . . • • 



^xi. Not annuals. Elongate s^olons produced by most 

 Leaves ...... • 



Leaves long. 



Rhachis of the spikes minutely hairy . 

 Rhachis of the spikes glabrous. 

 Glumes with an excurrent mucro 

 Glumes muticous or scarcely apiculate. 

 Glumes in fruit overlapping . 

 Glumes in fruit overlapping but little. 

 Spikelets in fruit acicular, divaricate . 

 Spikelets in fruit linear, suberect 

 § xii. Stems approximate on a nodose woody rhizome, 

 glumes ......•••" 



;ed. Leaves and bracts long. 



and flowering the second 

 63. C. Iria. 



6i. C. sphacelafus. 



66. C. incompresau*. 



65. C. compressus. 



67. C. arisfafi'S. 



species. 



72. C. socialis. 



73. C. pilosiis. 



. 70. C. eleusinoides. 



. 71. C. latifoIiHS. 



6S. C. (fisfaiis. 

 69. ('. nutans. 

 Spikelets hnrd with rigid 



74. C. prateHMs. 



