518 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



rounded-truncate; spikes 10 to 20 cm. 

 long, floriferous from base, the lower 

 spikelets often remote; glumes 4 to 6 

 mm. long; lemma with an awn 4 to 6 

 mm. long, the rudiment bearing a 



ground, Coastal Plain, New Jersey to 

 Florida and Louisiana. 

 3. Gymnopogon chapmanianus 



Hitchc. (Fig. 754.) Culms 30 to 40 

 cm. tall, in small tufts, ascending, 



Figure 753. — Gymnopogon brevifolius. Plant, X 1; floret, X 5. (Chase 3669, Va.) 



Figure 754. — Gymnopogon chapmanianus. Plant, X 1; florets, X 5. (Tracy 7102, Fla.) 



delicate shorter awn. % — Dry 

 pinelands, Coastal Plain, New Jersey 

 to Florida and Texas; dry woods, 

 Ohio to Kansas and south. 



2. Gymnopogon brevifolius Trin. 

 (Fig. 753.) Differing from G. ambiguus 

 in the longer, more slender, some- 

 what straggling culms, narrower, less 

 crowded blades, and in the subcapil- 

 lary spikes, floriferous only on the 

 upper half or third; lemma awnless or 

 with a minute awn. % — Dry 



sparingly branching from lower nodes, 

 rigid; leaves approximate toward the 

 base, the blades 5 to 6 cm. long, about 

 5 mm. wide, sharp-pointed, often sub- 

 involute in drying; spikes ascending 

 to spreading (not reflexed), floriferous 

 from base, spikelets not remote, 2- 

 or 3-flowered, the florets somewhat 

 spreading; lemmas pubescent, with a 

 minute awn or awnless; palea very 

 narrow, arched. % — Sandy pine- 

 lands, Florida. 



