CnLOHIl)E.E. 



411 



empty, bearing an awn; palea narrow, 2-keele(l. Stylos distinct. 

 Oruin linear, subtorete, enclosed by a firm glume, but not adherent. 

 Tall grasses witli short firm or long and flaccid loaves. Spikes 

 numerous, slender or filiform, at first erect, finally spreading, 

 scattered, or those below in whorls. 



Species 5 or G, belonging to America or the Old World. 



A genus nearly allied to Chloris. Our species are perennial 

 from short rootstocks, with short firm blades, 1-uerved empty 

 glumes, the floret bearing short hairs at tlie base. 



Gymnopogon differs from Trichloris in not having the spikelets 

 closely crowded, although sessile in two unilateral rows, the spikes 

 scattered or verticillate. 



1. G. ambiguus (Michx.) B. S. P. Prel. Cat. N. Y. 69 (1888). 

 Andropogon anibigims Michx. Fl. Bor. Am. 1 : 58 (1803). (i. rare- 

 mosns Beauv. Agrost. 104 (1813), G. svoparius Trin. Uuifl. 337 

 (1834). 



Culms wiry, leafy, clustered, 30 cm. high. 

 Ligule a fringe of hairs; blades flat, lance- 

 olate, 3-8 cm. long. Spikes 15-30 in number, 

 7-17 cm. long, each bearing 7-30 spikelets, 

 remote at tlie base. Empty glumes 1-nerved, 

 first 5 mm. long, second G mm. long, includ- 

 ing a short awn; floral glume cylindrical, 

 involute, 4 mm. long, with an awn as long; 

 empty terminal glume raised on a rachis over 

 3 mm. long, bcariiig an awn of equal length, 

 (irain narrowly oblong, 3 mm. long. 



Maryland, Bebb; Florida, Curfiss 3441. 



Sandy pine-bai-rens. New Jersey to Texas. 



3. G. brevifolius Trin. Unifl. 338 (1834). 

 Agrost. Bras. 430 (1839). 



Culms slender, wiry, leafy, 30-(IO cm. high. Ligule obsolete, 

 destitute of hairs; blades 2-5 cm. long. Spikes 15-20, very slender, 

 8-30 cm, long, containing 8-30 spikelets, sometimes borne on the 

 upper half or two-thirds. Empty glumes pointed, slightly unequal, 

 3-3.5 mm. long; floral glume 3.5 mm. long, with an awn 1 mm. 



Fig. 74. — Gymnomgon 

 ambiguus. Spike-let. 

 (Riclmrdson.) 



G. f(t!<tigiatus Noes, 



