34 C. B. Clarke: 



trigonis, a nodis inter sese 10 15 mm. distantibus in sicco pseudo- 

 articulatis; foliis 0, vagina summa in altero latere producta sca- 

 rioso-colorata rarissime viridi; umbellae radiis 10, usque ad 5 15 cm. 

 longis; bracteis 1 2 cm. longis, ovatis aut triangularibus, suberectis, 

 squamiformibus, concavis, marginibus non reflexis, pallidis; spiculis 

 5 15-nim spicatis, 14 cm. longis, 2 mm. latis, 12 50-floris, parum 

 compressis, stramineis fuscescentibus; glumis ovatis, obtusis, vixcarinatis; 

 rhachillae alis oblongis, proventu solutis; staminibus 3; nuce cum ^5 

 parte glumae aeqnilonga, oblonga aut ellipsoidea, trigona, nigra; stylo 

 quam nux breviore, ramis 3 paullo exsertis. 



Cyperus articulatus Linn.! Sp. PI. ed. I (1753) |j. 44, cd. II 

 p. 66; Kunth Enum. II p. 53; Boech. in Linnaea XXXVI (186970) 

 p. 274; Griseb.f PI. Ciib. p. 237; Sauv.f Cub. n. 2582 p. 172. 



Sloane Jamaica I p. 121 t. 81 fig. 1. 



Hab. in ins. caribaeis: Sieber n. 107; in Cuba: C. Wright 

 n. 3754; Jamaica: Elliott n. 3001, Purdie, W. Wright; Hispaniola: 

 Mayerhoff; Portorico: Eggers n. 429, Sintenis n. 2503, 2548, 2549, 

 5119, Stahl n. 1141; St. Thomas: Ehrenberg; Antigua: Wullschlaegel 

 n. 682; Guadeloupe: Duchassaing; Martinique: Belanger n. 1257, 

 Duss n. 700 partim, Hahn n. 1258; Trinidad: Crueger, Hart n. 2082, 

 3298, 5025, 0. Kuntze n. 1142. 



Distrib. iu tropicis et calidis totius fere orbis terrarum, 



36. Cyperus iiodosiis Willd. culmo 3 8 dm. longo, apice 

 1 IV2 nim. in diam., trigono; vagina summa in altero latere 1-^5 cm. 

 producta, rarius viridi; umbella 3 8 cm. in diam., 6 20-stachya; 

 bracteis 5 10 mm. longis, ima erecta viridi marginibus in sicco recur- 

 vatis scabris; ceteroquin fere ut C. ariicidaU forma teuuior. 



Cyperus nodosus Willd. Enum. Hort. Bcrol. (1809) p. 72; Boech. 

 in Linnaea XXXVI (1869 70) p. 275. 



Cyperus articulatus (partim) Kunth Enum. II (1837) p. 54; 

 Oriseb.f Flor. p. 564. 



Hab. in Jamaica: March; Martinique: Duss n. 700 partim. 



Distrib. in America centrali, Novo-Granata, Ecuador. 



37. Cyi)erus rotuiiclus Linn. glaber rhizomate tenuiore ligneo a 

 tuberibus incrassato; culmis 1 8 dm. longis, basi bulboso-incrassatis, 

 in rhizoma oblique descendentibus; foliis culmum saepe superantibus, 

 4 6 mm. latis; umbella evoluta composita aut simplice vel depauperata; 

 bracteis umbellam superantibus, cum foliis consimilibus; spiculis 3 8- 

 nim laxiuscule spicatis, 2 cm. longis, I72 2 mm. latis, 20 30-floris, 

 modice compressis, rubescentibus aut castaneis vel viridibus; rhachillae 

 alis hyalinis, vix solubilibus; glumis ovatis, obtusis, in lateribus sub- 



