120 



FIELD COLUMBIAN MUSEUM BOTANY-, VOL. 2. 



winged, falling away from the axis, two lower empty scales persist- 

 ent. Stamens 3. 



Cyperus Caymanensis sp. nov. 

 Cyperus sp, Britton, on page 29. 



Culms slender, wiry, 3-angled and somewhat grooved, 4-7 dm. 

 long, i mm. wide, glabrous. Sheaths brown, scarious, glabrous. 

 Leaves shorter than the culm, 2-4 dm. long, 1.5 mm. wide, folded, 

 setose at the scabrous tip, otherwise smooth. 



Bracts 2 or 3, 1-3 cm. long, 1.5 mm. wide. Inflorescence a 



dense head of 3 or 4 subglobose 

 spikes 6-7 mm. wide, light 

 brown, dense, ovoid, 4x5 mm., 

 of 20-30 spikelets crowded on 

 the rachis; spikelets golden 

 brown, ovoid, acute, 1.5 mm. 

 long, rachilla i-fruited, much 

 reduced. Scales 4 to each 

 spikelet, 2 lower empty, per- 

 sistent, short, i-i.i mm.; fruit- 

 ing scale golden-brown, broadly 

 ovate, submucronate, keeled, 

 striately n-nerved, nearly twice 

 the length of and enfolding the 

 achene and the base of the 

 terminal scale which is empty, light-green, scaphoid, acute at the 

 base and 1.7 mm. long. Style divided to near the base, as long 

 as the achene. Achene dark amber-brown, rounded pyriform, .6x 

 1.2 mm.; in section strongly triangular the angles keel-like, the 

 facets deeply concave and marked by regularly disposed circular pits. 

 Ditches along the Bodden Bay road beyond Spot Bay, Grand 

 Cayman (1334). Near C. uniflorus pumilus Britton. 



CYPERUS LIGULARIS Linn. Amoen. Acad., 5:391. 



Marts c us rufus H. B. K. 



Mariscus ligularis Urb. 



Bracts 4-7, leaf-like, 3-7 dm. long, minutely sharp serrate, 

 florescence a compound umbel, 

 rays 8-12, 1-9 cm. long; second- 

 ary umbels congested, sub- 

 corymbose; spikes rufous, sessile 

 or subsessile, the terminal one 

 cylindrical. 2-3 cm. long, i cm. 

 wide, the lateral deflexed, 1-2 

 cm. long. Spikelets reddish- 

 brown, ellipsoid, 1.5x3-5 mm., 

 densely crowded, divergent, 

 2-4-fruited; rachilla wings small. 

 Scales reddish-brown with a 

 dull-green midrib, ovate, ob- 

 tuse, striate, keeled, twice the 

 length of the achene. Style longer than the achene, divided to near 



In- 



