156 PANICACE^. 



" Has a more flattened culm, longer, narrower, and smoother 

 leaves, and the perfect flower obscurely wrinkled. In damp soil 

 along the coast, Florida to North Carolina." (Chapman's Flora.) 



A plant from Dr. Mohr, Mobile, Alabama, has the smooth 

 slender leaf, but is otlierwise like C. glmica. 



Two plants collected in Harrisburg, Texas, by Prof. Mark W. 

 Harrington, answer to Chapman's description of C. Imvigata, with 

 the addition that the spikelets are considerably narrower than those 

 of C. glanca. 



Var. geniculata (Beauv.). Setaria geniculata Beauv. Agrost. 

 51 (1812). Panicum getiiculatum Lam. Encycl. 4:727 (1791). 

 Pennisetum geniculatum Jacq. Eclog, Gram. t. 27 (1813). 



Culms slender, often ascending; sheaths glabrous; blades slen- 

 der, smooth; spike yellowish green, more slender, 4-5 mm. diam., 

 bristles usually shorter. 



Texas, Reverchon; Mexico, Bourgeau 231, 2031, Wright 3472, 

 Palmer 293. 



Texas to South America. 



Var. perennis (Curtiss). A slender-leaved perennial plant, 

 coming from scaly rootstocks. 



Florida, Curtiss 3614*; Texas, Reverchon; Cuba, Wright. 



10. C. corrugata (Schultes). Kuntze, Eev. Gen. PL 770 (1891). 

 Setaria corrugata Schultes, Mant. 2:276 (1824). Panicum corru- 

 gata Ell. Bot. S. C. & Ga. 1: 123 (1816). 



Culms slender, branching below, long exserted, about 60 cm. 

 high. Leaf -blades flat, twisted as in C. glauca, slightly rough, nar- 

 row, tapering towards the base, 20-30 cm. long, 4-7 mm. wide. 

 Spikes compound, green, densely cylindrical, 2-10 cm. long, 7 mm. 

 diam., not counting the bristles, which are often 1 cm. in length. 

 Spikelets 6-10 in a cluster (developed and abortive), having 1-2 

 bristles each, with asperities pointing upwards, oval, almost pointed, 

 gibbous, 2 mm. long; first glume deltoid, half as long as the spike- 

 let, 3-nerved, second broad, longer, concave, 5-nerved ; floral glume 

 of the neuter floret as long as the spikelet, 5-nerved, its palea mi- 

 nute ; fertile floret strongly wrinkled transversely. 



Florida, Curtiss 3616. 



