MANUAL OF THE GRASSES OF THE UNITED STATES 737 



ultimate branchlets long-bearded toward the summit; racemes 2 or 3, 

 feathery, 2 to 4 cm long, the very slender flexuous rachis and the pedi- 

 cel copiously long- villous; sessile spikelet about 4 mm long, the awn 

 loosely twisted below, 1 to 2 cm long; pedicellate spikelet obsolete. 

 % —Pine woods, Georgia and Florida to Louisiana (fig. 1646 k 

 Resembling A. I on gi- 

 ber bis, mostly more 

 slender and with nearly 

 glabrous foliage. 



19. Andropogon longi- 

 berbis Hack. (Fig. 

 1647.) Resembling A. 

 virginicus; sheaths, 

 especially of the innova- 

 tions, appressed grayish- 

 villous; inflorescence on 

 the average less com- 

 pound, the racemes 

 more copiously 



long- 



Figuee 1646. — Distribution of 

 Andropogon tracyi. 



villous, the spikelets 4 

 to 4.5 mm long. % m — 

 Pine woods, Florida. 

 Intergrades with A. vir- 

 ginicus. 



20. Andropogon per- 

 angustatus Nash. (Fig. 

 1648.) Culms in small 

 tufts, slender, wiry, 

 erect, the upper third to 

 half sparingly branch- 

 ing; lower sheaths 

 keeled, very narrow, 

 occasionally sparsely 

 villous; ligule about 1.5 

 mm long, firm; blades 

 mostly folded, sub- 

 filiform, flexuous, glabrous or rarely pilose; inflorescence slender, of 

 few to several racemes, resembling that of slender specimens of 

 A. virginicus, the peduncles usually short but the spathes sometimes 

 attenuate to base, the peduncle 1 to 2 cm long; racemes as in A. vir- 

 ginicus. Ql — Bogs and moist pine woods, Florida and Mississippi. 



21. Andropogon brachystachys Chapm. (Fig. 1649.) Culms 

 tufted, erect, 1 to 1.5 m tall, the upper half loosely branching; sheaths 



Figtjbe 1645.— Andropogon tracyi, X 1. (Type.) 



