450 CYPERACEA. 
50. Cyperus obesus, Liebm. Mexicos Halvgr. p. 23; Steud. Cyp. p. 55. 
Souta Mexico, Hacienda de Mirador, at 3000 feet, and Potrero de Consoquitla 
(Liebmann). 
51. Cyperus crstedii, Liebm. Mexicos Halvgr. p. 36; Steud. Cyper. p. 57; 
Walp. Ann. iii. p. 676. 
Nicaraaua, near Segovia (@rsted). 
52. Cyperus olfersianus, Kunth, Enum. Pl. ii. p. 10; Boeck. in Linnea, xxxv. 
p- 439; Clarke in Journ. Linn. Soc. xxi. p. 62. 
Cyperus helvus, Liebm. Mexicos Halvgr. p. 9. 
Cyperus ambiguus, Liebm. Mexicos Halvgr. p. 11, non Steud. 
Cyperus correctus, Steud. Cyper. p. 7. 
SoutH Mexico, San Antonio, Huatusco, 4500 feet, and Mecapolca (Liebmann), Vera 
Cruz to Orizaba (Miiller, 1765; Bourgeau, 2731); Guatemana, Mazatenango and 
Chojoja (Bernoulli, 418, 575).—Cusa to Urnvavay. Hb. Kew. 
53. Cyperus perpusillus, Boeck. in Linnea, xxxv. p. 499. 
SouTtH Mexico, without locality (Coulter, 1611, ex parte). 
54. Cyperus piceus, Licbm. Mexicos Halvgr. p. 12; Boeck. in Linnea, xxxv. 
p. 495 in nota (ubi errore picreus) ; Clarke in Journ. Linn. Soc. xxi. p. 43. 
SoutH Mexico, Vera Cruz to Orizaba (Miller, 1987, partim), neighbourhood of San 
Pedro Nolasco, and San Antonio Huatusco, 4500 feet (Ziebmann). Hb. Kew. 
55. Cyperus polystachyus, Rottb. Descr. et Ic. p. 39, t. 11. fig. 1; Boeck. in 
Linnea, xxxv. p. 477; Clarke in Journ. Linn. Soc. xxi. p. 51 (varietates plures). 
Cyperus microdontus, Torr. in Ann. Lyc. Nat. Hist. N. York, iii. p. 255, et in Bot. U. S. & Mex. 
Bound. Surv. p. 226. 
Cyperus texensis, Steud. Cyper. p. 9. 
Cyperus fugax, Liebm. Mexicos Halvgr. p. 8. 
Pycreus olfersianus, Nees, in Mart. Fl. Brasil. Cyper. p. 8, non Cyperus olfersianus, Kunth. 
New Jersry to Fioripa and Texas.—Sourn Mexico, Morelia at 6000 feet (Galeott?, 
9843), Vera Cruz to Orizaba (Miller, 2155).—Spread over nearly all Tropica, and 
SUBTROPICAL REGIONS in the world. Hb. Kew. 
56. Cyperus prolixus, H.B. K. Nov. Gen. et Sp. i. p. 206; Kunth, Enum. Pl. 
ii. p. 79; Boeck. in Linnea, xxxv. p. 593; Liebm. Mexicos Halvgr. p. 24. 
South Mexico, San Antonio, Huatusco (Liebmann), Escamella, Orizaba (Bourgeau, 
2976 ; Miller, 1980); Guaremata, San Geronimo and Volcan de Fuego (Godman & 
Salvin).—Cotompra to Urnvavay. Hb. Kew. 
57. Cyperus pycnostachyus, Kunth, Enum. PI. ii. p. 77; Boeck. in Linnea, 
XXXvi. p. 322. 
Mariscus pycnostachyus, H.B.K. Nov. Gen. et Sp. 1. p. 215, t. 65. 
