FEB. 1903. PLANTVE YUCATANJE MILLSPAUGH & CHASE. 



69 



20-30 flowered, oblong, grayish chestnut; rachilla wingless. Glumes 

 closely imbricated, broadly ovate, mucronate, 2 mm. long, 3-nerved, 

 reddish brown with green keel and white margins. Style as long 

 as the glume, stigmas exserted. .; Achenes undeveloped in speci- 

 mens seen, */*, the length of the glume, brown, ovoid, triangular, the 

 ventrum broadest and slightly concave. 



Hab. Aguada Xcholac, March, 1866, Schott 563 ; "common on 

 the borders of cenote"s near Izamal, 3 feet high," Gaumer 483. 



Cyperus ochraceus Vahl Enum., 2:325. 



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

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



2 cm. long ; bractlets 5-10 mm. long. 

 Spikes pale-ocher, subglobose, i cm. 

 wide, having 10-20 spikelets subdigitate 

 from the reduced rachis. Spikelets 

 strongly compressed, ovate-oblong, 

 2 x 5-10 mm. , 18-20 fruited; rachilla 

 wingless. Glumes ocher with a broad, 

 green dorsal stripe, loosely cellular, 

 ovate, acute, subapiculate, closely 

 imbricated, 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 achene, 

 divisions short. Achene brown, ovoid, .5-.6xi.2 mm., in section 

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

 convex, the ventral plane, all marked by regular, sharp hexagona 

 reticulations rising perpendicular to the surface of the achene. 



Hab. Aguadas and cenote"s, Nabula, Hacienda Chable", Aug. 8, 

 1865, Schott 568 ; abundant on open lands near Izamal, Gaumer 388, 

 1028 ; in shallow standing water in field at the Caleta, Island of Cozu- 

 mel, Millspaugh PL Utowana 1519. 



Cyperus elegans L. Sp. PI. 2:68. 



Cyperus viscosus Sw. 



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 divergent from the 

 reduced rachis. Spikelets 

 compressed, oblong, 3x8-10 

 mm., lo-fruited; rachilla wing- 

 less. Glumes fuscous to chest- 

 nut with pale green margins 

 and m i d v e i n , suborbicular, 

 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. 



Inflorescence a 6-io-rayed 



