760 



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



racemes mostly 4, tawny, 2 to 4 cm. 

 long, on peduncles mostly about 2 

 cm. long, or the terminal ones some- 

 times long-exserted ; rachis scarcely 

 flexuous, the joints shorter than the 

 spikelets, copiously long-villous ; 

 sessile spikelet 4 to 5 mm. long, the 

 awn loosely twisted below, 1.5 to 2 

 cm. long; pedicel long-villous, the 

 spikelet reduced to a minute glume. 

 <2[ — Wet pine woods and sandy 

 seacoast, Virginia to Georgia and 

 Louisiana. 



Figure 1157. — Andropogon ternarius, X 1. (Chase 

 4557, N. C.) 



17. Andropogon cabanisii Hack. 

 (Fig. 1156.) Culms in small tufts, 

 erect, 80 to 150 cm. tall, the upper 

 half bearing long slender branches; 

 sheaths villous to nearly glabrous; 

 blades 2 to 3 mm. wide; inflorescence 

 loose; racemes 2, pale grayish tawny, 

 with about 15 joints, 4 to 7 cm. long, 

 on slender long-exserted peduncles, 

 the spathes narrow, inconspicuous, or 

 a few occasionally dilated; rachis not 

 flexuous or but slightly so, the joints 



shorter than the spikelets, long- 

 villous; sessile spikelets 6 to 7 mm. 

 long, the first glume firm, scabrous 

 and often 2-nerved between the keels, 

 the awn twisted below, about 1.5 

 cm. long; pedicel long-villous, the 

 spikelet reduced to a slender glume 

 or obsolete. % — Dry pine woods, 

 peninsular Florida. 



18. Andropogon ternarius Michx. 

 (Fig. 1157.) Culms tufted, erect, 80 

 to 120 cm. tall, the upper half to 

 two-thirds branching, the branches 

 usually long, slender and erect; leaves 

 often purplish-glaucous, glabrous, or 

 the lower loosely villous, the blades 

 2 to 4 mm. wide; inflorescence elon- 

 gate, loose, of few to many pairs of 

 silvery to creamy or grayish feathery 

 racemes, usually on long-exserted 

 peduncles from slender inconspicuous 

 spathes, some of the lateral peduncles 

 often short, from dilated spathes, 

 rarely most of them so; racemes 3 to 

 6 cm. long, with mostly less than 12 

 joints, the rachis not flexuous, the 

 joints shorter than the spikelets, 

 copiously long-villous; sessile spike- 

 lets 5 to 7 mm. long, glabrous and 

 nerveless between the keels, the awn 

 twisted below, 1.5 to 2 cm. long; 



Figure 1158.- 



-Andropogon arctatus, X 1. (Chapman, 

 Fla.) 



