PANICE.E. 115 



15. P. Curtisii Steud. Syn. PI. Gram. 06 (1855), not Chapm. 

 (1860). 



P. Walteri Ell. Bot. S. C. and Ga. 1: 115 (1816). 



P. carinatum Torr. Bost. Journ. Nat. Hist. 1: 137 (1835), not 

 Presl (1830). 



P. digitarioides Carpenter, ex M. A. Curt, in Am. Journ. Sc. 

 (II.) 7: 410 (1849), not Kasp. ex Steud. Norn. 



Culms slender, rigid, often rooting at the lower nodes, 100-130 

 cm. high. Sheaths sometimes hairy ; blades smooth, rigid, 15-20 

 cm. long, 10-15 mm. wide. Panicle slender, simple, 15-18 cm. 

 long. Spikes appressed, the lower 2-4 cm. long, 5-8 cm. distant, 

 the upper crowded and very short, rachis slender, flexuous, trian- 

 gular. Spikelets mostly in pairs on pedicels shorter than them- 

 selves, each containing a staminate and a perfect flower, ovate- 

 lanceolate, 2-2.5 mm. long; first glume half as long as the spikelet, 

 acute, 3-nerved, second ovate, 5-nerved; floral ghime of the sterile 

 floret like the second empty glume ; palea oval, as long as its 

 glume 2-nerved; fertile floret ovate-lanceolate, acute, much like 

 the preceding. 



Florida, Curtiss 3585. 



Ponds and swamps. North Carolina to Florida and Texas. 



16. P. obtusum H. B. K. Nov. Gen. 1 : 98 (1815). 



A glabrous tufted grass, decumbent or creeping, hairy at the 

 nodes and near the ligule, 15-40 cm. high. Leaf-blades firm, 

 slender, 5-12 cm. long, 2-4 mm. wide. Spikes 3-5, mostly simple, 

 erect, usually longer than the internodes, 1-4 cm. long, rachis fili- 

 form, triangular, flexuose. Spikelets mostly in pairs, smooth, 

 oval, obtuse, 3 mm. long, first glume one-third shorter than the 

 spikelet, ovate with 5 green nerves, second longer, 7-9-nerved; 

 floral glume of the staminate floret like the first empty glume, first 

 palea ovate, 2-nerved. Stamens 3. Fertile floret elliptical. 



Texas, Jones 3168 ; Arizona, U. S. Dejd. Agricul. 85 from 

 Lemmon. 



Texas, Arizona, and Mexico. 



17. P. prostratum Lam. 111. 1: 171 (1783). P. ccespitosum Sw. 

 Fl. Ind. Occ. 1: 146 (1797), not Spreng. 



