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



crowded at base, broad, strongly keeled ; blades mostly folded, 4 to 6 

 mm wide; inflorescence decompound, loose, the ultimate capillary 

 branchlets commonly recurved, long- villous toward the summit; 

 spathes slender, the long peduncles often exserted from the^ summit; 

 racemes 2, flexuous, mostly 1 to 1.5 cm long, the rachis joint and 

 pedicel long- villous ; sessile spikelet about 4 mm long, the awn scarcely 

 1 cm long. % — Moist pine woods, Florida. The racemes are 

 frequently affected by a smut, making them shorter and denser, 

 reducing the size of the spikelet and the awn. The inflorescence 

 resembles that of A. capiUipes, but the racemes mostly more numer- 

 ous; the ultimate branchlets are long- villous toward the summit, and 

 the spikelets larger. 



22. Andropogon capiUipes Nash. (Fig. 1650.) Plants conspic- 

 uously glaucous; culms tufted, slender, erect, 60 to 100 cm tall, the 



Figure 1G47.— Andropogon longiberbis, X 1. (Garber, Fla.) 



Figure 1648.— An drop ogon 

 perangustatus, X 1. (Fred- 

 holm 6072, Fla.) 



upper third to half with few to several slender branches; sheaths 

 crowded at base, keeled, chalky-glaucous; blades mostly folded, 2 to 

 4 mm wide; inflorescence narrow but loose, the branches often flexuous 

 to zigzag, the ultimate capillary branchlets finally spreading or re- 

 curved, glabrous, the dilated purplish-brown spathes 2 to 3.5 cm 

 long, glabrous; racemes 2, less flexuous than in A. virginicus, 1 to 

 2.5 cm long; rachis joint about half as long as the sessile spikelet, the 

 pedicel about equaling the spikelet, both copiously long-villous ; sessile 

 spikelet 3 mm long, the delicate straight awn about 1 cm long. 

 91 — Sandy pine and oak woods, southern North Carolina, South 

 Carolina, and Florida. 



23. Andropogon virginicus L. Broomsedge. (Fig. 1651.) Culms 

 erect, 50 to 100 cm tall, usually in rather small tufts, the upper two- 

 thirds mostly freely branching; lower sheaths compressed, keeled, 

 equitant; sheaths glabrous or more or less pilose along the margins, 

 occasionally conspicuously so; ligule strongly ciliate; blades flat or 

 folded, 2 to 5 mm wide, pilose on the upper surface toward base; 



