122 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. 2. 



Bracts 4, leaf-like, .5-3 dm. 



achene. Style longer than the achene, divided to near the base. 

 Achene shining - black, obovoid, .7-. 9 x 1.4 mm., in section like 

 C. bruneus, the facets marked by low, sharp, hexagonal ridges, the 

 interspaces occupied by small semi-globular papillae. 



In dry sandy soil, south of Charlotte Amalia, St. Thomas (428); 

 in the sandy, cactus-covered center of Ratones Island, Port of Ponce", 

 Porto Rico (654); sandy shore near Georgetown, Grand Cayman 

 (1248); and at m the southwest end of Perez Island, Alacran Shoals 

 (1746), but on no other islet of the group. 



CYPERUS PLANIFOLIUS L. Cl. Rich. Act. Soc. Hist. Nat. Par. , 1:106. 

 Cyperus purpurascens Vahl. 

 Cyperus bruneus in part Britton, on page 28. 

 Mariscus purpurascens Clarke. 

 Mariscus planifolius Urb. 



long. Inflorescence a 4-io-rayed 

 spreading umbel, 5-6 cm. wide; 

 rays 1-4 cm. Spikes reddish- 

 brown, broadly oblong or when 

 densely fruited subglobose, 2-2.2 

 cm. wide; bractlets 2-6 cm. long, 

 narrow, and often bristle-like; 

 spikelets 10-30, compressed ob- 

 long, 2 x 10-15 nun., 6-io-fruited; 

 rachilla narrowly winged. Scales 

 reddish-brown with a green 

 keel, ovate, obtuse, striate, hya- 

 line-margined, loosely imbri- 

 cated, twice the length of the 



achene. Style twice the length of the achene, divided half its 

 length. Achene dark reddish-brown, ellipsoid, . 7-. 75 x 1.9 mm., in 

 section triangular with a rounded dorsal angle; facets marked by 

 sharp hexagonal reticulations, the interspaces occupied by semi- 

 globular papillae larger than in C. brizaeus. 



On low sandy fields at The Creek, Cayman Brae (1182); and 

 the west shore of the Isle of Pines, Cuba (1427). 



TORULIN1UM. Characters of \Mariscus except: Spikelets 

 terete or subterete; rachilla deciduous in i-fruited nodes, with broad 

 wings clasping the achene. Spikelets more loosely disposed in pec- 

 tinate or digitate spikes. 



CYPERUS FERAX L. Cl. Rich. loc. cit. 



Cyperus densiflorus Britton, on page 28. 



Torulininm confer turn Ham. 



Torulinium ferax Urb. 



Bracts leaf-like, 1-4 dm. long. Inflorescence in a compound 

 spreading umbel, 10-20 cm. wide; primary rays 3-6, i-io cm. long; 

 secondary rays 1-2 cm. long. Spikes broadly flabellate in out- 



