AUG. 1900. 



PLANTJE UTOWAN^E MILLSPAUGH. 



119 



umbel, rays 6-10, 2-5 cm. long; secondary umbels 2-4-rayed, rays 



2 cm. long; bractlets 5-10 mm. 

 long. Spikes pale-ochre, sub- 

 globose, i cm. wide, having 

 10-20 spikelets subdigitate from 

 the reduced rachis. Spikelets 

 strongly compressed, ovate-ob- 

 long, 2x5-10 mm., i8-2o-fruited; 

 rachilla wingless. Scales ochre 

 with a broad, green dorsal 

 stripe, loosely cellular, but less 

 so than in C. virens, ovate, 

 acute, subapiculate, closely im- 

 bricated, keeled above but hollow 

 below from the pressure of the adjacent achene; 3-veined, the mid- 

 vein forking to border the depression; scale a little longer than the 

 achene. Stamen i, lateral. Style subciliate, shorter than the ach- 

 ene, divisions short. Achene brown, ovoid, .5-. 6x1.2 mm., in sec- 

 tion triangular, the dorsal angle very bluntly rounded, the dorsal 

 facets convex, the ventral plane, all marked by regular, sharp hex- 

 agonal reticulations rising perpendicular to the surface of the achene. 

 In shallow water covering a field at the Caleta, Cozumel (1519). 



CYPERUS ELEGANS Linn. Sp. PI., 2:68. 



Cyperus viscosus Sw. 



Cyperus viscosus Britton, on page 29. 



Bracts 3, leaf-like, 2-3 dm. long, 

 umbel, one spike sessile, rays 1-6 

 cm. long. Spikes mottled pale- 

 green and brown, subglobose, 

 composed of 8-20 spikelets diverg- 

 ent from the reduced rachis. 

 Spikelets compressed, oblong, 3 x 

 8-iomm., lo-fruited; rachilla wing- 

 less. Scales fuscous to chestnut 

 with pale-green margins and mid- 

 vein, sub-orbicular, mucronate, 

 less than twice the length of the 

 achene, obliquely spreading; keel 

 thickened at the apex, expanding into 7 nerves below. Stamens 3. 

 Style shorter than the achene, divided to near the base. Achene 

 black, pyriform, .9x1.7 mm., in section triangular, the facets all 

 equally concave and marked by horizontal reticulations resembling 

 a net, the meshes each including a single slight papilla. 



Along the borders of a brackish lagoon at The Creek, Cayman 

 Brae (1171); two of these plants are undersized and show a prolifer- 

 ous habit, sprouts replacing achenes in the fruiting spikelets. 

 Brackish bog on the north shore of Cozumel (1596), and in a simi- 

 lar situation at Progreso, Yucatan (1686). 



Inflorescence a 6-io-rayed 



MARISCUS. Characters of Eucyperus except: rachilla slightly 



