PANICE.B. 157 



Georgia to Florida. 



11. C. imberbis (Poir) Kimtze, IJev. Gen. PI. 767 (1891). 

 Pat/icion iniberbe Poir, Lam. Encyl. Suppl. 4:272 (1810). Sc- 

 taria imberbis, R. & S. Syst. 2:891 (1817). 



Culms oroet. slender, branching sparingly, 30-50 cm. high. 

 Sheaths often longer than the internodes; ligule very short; blades 

 flat, smooth or scabrid or soon involute, 6-18 cm. long, 3 mm. 

 wide. Spikr simple, cylindrical, green, 4-5 cm. long, 4-5 mm. 

 diam., awnlike branches about 5, with the asperities directed u])- 

 wards, branches 4-6 mm. long, Spikelets flat on one side, ovoid, 

 pointed, about 2 mm. long, first glume broad, half as long as the 

 spikelet, 5-nerved, second longer and wider, 5-7-nerved; fertile 

 floret gibbous on one side, marked with transverse wrinkles. 



Texas, Xealley. 



Mississippi and Texas. 



12. C. viRiuis (L.) Porter, Bull. Torr. Club, 20:196 (1893). 

 Pigeon-(;rass. Bottle-grass. Greex Foxtail. Panicnm 

 viride L. Sp. PI. Ed. 2 : 83 (1762). Setaria viridis Beauv. Agrost. 

 51 (1812). 



Culms erect, branching below, 30-60 cm. high. Ligule and 

 margins of sheaths ciliate; blades flat, scabrous, not twisted while 

 growing, acuminate, tapering toward the base, on large })lants 

 15 cm. long, 10 mm. wide. Spikelikc panicle erect, green, nearly 

 cylindrical, 3-8 cm. long. The lower spikelets in small clusters, 

 the upper fewer or single, the bristles, 1-5 for each spikelet. often 

 10 mm. long, the asperities directed upwards. Spikelets oval, 2 

 mm. long, first glume one-half as long, 1-nerved, second and third 

 glumes equal, 5-7-nerved; fertile floret oval, the surface containing 

 minute vertical lines, seen only under a lens. 



Very common in fields which are in cultivation, resembling con- 

 siderably small forms of C. Ifalica. It starts earlier in the spring 

 and flowers much earlier than C. glauea in the Northern States. 



Michigan, M. A. C. Beal 25, 26, Far well, Clark 752; Montana, 

 Anderson 17. 



13. C. caudata (Lam.). Pamcum caitdatum Lam. Til. 1:171 

 (1791). Setaria caudata R. & S. Syst. 2: 495 (1817). 



