56 Annals of the Carnegie Museum. 



Glumes awned from the notched apex; spikelets including awns, scarcely i cm. 



long 125. Reynaudia filiformis. 



Spikelets articulated above the glumes. 



Inflorescence of one-sided spikes or racemes; spikelets sessile or nearly so. 

 Spikelets with one or two sterile florets above the perfect one. 



Spikelets awnless; spikes dark brown 131. Chloris petrcea. 



Spikelets awned; spikes green or yellow 130. Chloris paraguaiensis. 



Spikelets with 2 or 3 perfect florets. 



Spikes alternate, more or less remote along the main axis, spikelets not 



crowded 133. Leptochloa filiformis. 



Spikes digitate or nearly so, spikelets crowded 132. Eleusine indica. 



Inflorescence paniculate, sometimes contracted but spikelets never sessile in 

 i-sided spikes. 

 Spikelets i-flowered. 

 Lemma awnless. 



Plants with long rhizomes; blades distichous. 



129. Sporobolus virginicus 

 Plants cespitose, not with rhizomes; blades not distichous. 



Panicle dense and spike-like 128. Sporobolus indicus. 



Panicle open; basal sheaths copiously felty-ciliate. 



127. Sporobolus cubensis. 

 Lemma awned, indurate, convolute; awn 3-fid.. . .126. Arislida refracla. 

 Spikelets 2-many-flowered. 



Lemmas 3-nerved, not at all indurated. 



Creeping annuals with dioecious flowers.. .137. Eragroslis hypnoides. 

 Not creeping; flowers perfect. 



Annuals; palea prominently ciliate 134. Eragrostis ciliaris. 



Perennials. 



Plants low, 10-20 cm. high; blades involute; panicle not 



diffuse 135. Eragrostis cubensis. 



Plants tall; blades flat; panicles very diffuse. 



136. Eragrostis Elliottii. 

 Lemmas many-nerved, somewhat indurated and rigid. 



138. Distichlis spicata. 



68. Hackelochloa granulans (Linnaeus) Kuntze. 



Cenchrus granularis "Litii^JEVS, Mantissa Plantarum, 1771, p. 575- 



Manisurus granularis Swartz, Prodromus Descriptionum Vegetabilium Indiae 



OccidentaHs, 1788, p. 25. 

 Manisurus polystachya Beauvois, Flore de Royaumes d'Oware et de Benin, I, 



1805, p. 24. 

 Rytilix granularis Skeels, Bureau Plant Industry, U. S. Dept. Agriculture, XX, 



1913, p. 282. 



Near Nueva Gerona, May 12, 1904, A. H. Curtiss, No. 493. General 

 Distribution: General throughout tropical regions, extending north- 

 wards in America to Florida, Georgia, Arizona, and Lower California. 



