762 



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



Low pine woods, Florida. An oc- 

 casional peduncle bears 3 racemes. 

 21. Andropogon tracyi Nash. (Fig. 

 1160.) Culms in small tufts, slender, 

 erect, the upper third sparingly 

 branching; sheaths keeled, narrow, 

 glabrous or nearly so; blades 2 to 3 

 mm. wide, sometimes ciliate toward 

 base; inflorescence of 8 to 10 rela- 

 tively distant racemes, the slender 

 ultimate branches often recurved, 



cence on the average less compound, 

 the racemes mostly 3, more copiously 

 long-villous, the spikelets 4 to 4.5 

 mm. long. % — Pine woods, Geor- 

 gia and Florida, Intergrades with A. 

 virginicus. 



23. Andropogon perangustatus 

 Nash. (Fig. 1162.) Culms in small 

 tufts, slender, wiry, erect, the upper 

 third to half sparingly branching; 

 lower sheaths keeled, very narrow, 



Figure 1161. — Andropogon longiberbis, X 1. (Garber, Fla.) 



Figure 1162. — Andropogon per- 

 angustatus, X 1. (Fredholm 

 6072, Fla.) 



the dilated spathes 4 to 6 cm. long, 

 attenuate below, the enclosed pe- 

 duncle 1 to 3 cm. long; ultimate 

 branchlets long-bearded toward the 

 summit; racemes 2 or 3, feathery, 2 

 to 4 cm. long, the very slender 

 flexuous rachis and the pedicel copi- 

 ously 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. Resembling A . longiberbis, 

 mostly more slender and with nearly 

 glabrous foliage. 



22. Andropogon longiberbis Hack. 

 (Fig. 1161.) Resembling A . virginicus; 

 sheaths, especially of the innovations, 

 appressed grayish-villous; inflores- 



occasionally sparsely villous; ligule 

 about 1.5 mm. long, firm; blades 

 mostly folded, subfiliform, flexuous, 

 glabrous or rarely pilose; inflores- 

 cence slender, of few to several 

 racemes, resembling that of slender 

 specimens of A. virginicus, the pe- 

 duncles usually short but the spathes 

 sometimes attenuate to base, the 

 peduncle 1 to 2 cm. long; racemes 

 as in A. virginicus. 91 — Bogs and 

 moist pine woods, Florida and Mis- 

 sissippi. 



24. Andropogon brachystachys 

 Chapm. (Fig. 1163.) Culms tufted, 

 erect, 1 to 1.5 m. tall, the upper 

 half loosely branching; sheaths crowd- 

 ed at base, broad, strongly keeled; 

 blades mostly folded, 4 to 6 mm. 



