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MANUAL OF THE GRASSES OF THE UNITED STATES 



panicles more compact, branches as- 

 cending, spikelets 1.7 mm. long; 

 blades shorter, narrower. % 

 Dry woods, Coastal Plain, South 

 Carolina to Texas; Tennessee. 



Figure 921. — Panicum polycaulon. Two views of 

 spikelet, and floret, X 10. (Type.) 



Figure 919. — Panicum xalapense. Two views of spike- 

 let, and floret, X 10. (Type.) 



11. Panicum ciliatum Ell. (Fig. 

 920.) Vernal culms 5 to 30 cm. tall; 

 sheaths ciliate on the margin; blades 

 3 to 6 cm. long, 3 to 8 mm. wide, 

 the uppermost often much smaller, 

 ciliate with stiff hairs 2 to 3 mm. 

 long; panicle 3 to 4 cm. long, the 

 axis pilose, branches spreading; spike- 

 lets 1.8 to 2 mm. long, pilose. Au- 

 tumnal mats with slightly smaller 

 blades. 21 — Low pinelands and 

 hammocks, Coastal Plain, North 

 Carolina to Florida and Texas; Mex- 

 ico. 



Figure 920. — Panicum ciliatum. Two views of spike- 

 let, and floret, X 10. (Type.) 



12. Panicum polycaulon Nash. 

 (Fig. 921.) Vernal culms 10 to 20 

 cm. tall ; blades mostly narrower than 

 in P. ciliatum, panicle similar; spike- 

 lets 1.5 to 1.6 mm. long (rarely as 

 much as 2 mm.), glabrous. Autumnal 

 mats very dense. % — Low pine 

 woods, Coastal Plain, Georgia, Flor- 

 ida, Alabama, and Mississippi; West 

 Indies; British Honduras. 



13. Panicum strigosum Muhl. (Fig. 

 922.) Vernal culms 15 to 30 cm. tall, 

 the culms and sheaths sparsely pilose; 

 nodes bearded; blades mostly 5 to 7 

 mm. wide, pilose on both surfaces, 

 stiffly ciliate; panicle 4 to 6 cm. long, 

 axis and branches pilose; spikelets 

 1.3 to 1.5 mm. long, glabrous. Au- 

 tumnal phase a dense mat. % — 

 Sandy woods, Virginia and Ten- 

 nessee to Florida and Texas; Mexico 

 and Cuba to Colombia. 



Figure 922. — Panicum strigosum. Two views of spike- 

 let, and floret, X 10. (Type.) 



3. Angusti folia. — Densely tufted, 

 grayish green; ligules not more 

 than 1 mm. long; blades narrow, 

 usually stiff, with, prominent 

 nerves, sometimes longitudinally 

 wrinkled, often ciliate at base; 

 spikelets attenuate at base, rather 

 strongly 7-nerved, papillose- 

 pubescent; first glume narrow 

 and sheathing at base. Autumnal 

 culms repeatedly branching, 

 forming bushy crowns; blades 

 greatly reduced. 

 14. Panicum aciculare Desv. ex 

 Poir. (Fig. 923.) Vernal culms as- 

 cending from a spreading base, 20 

 to 50 cm. tall, appressed-pubescent 

 below; lower sheaths villous; blades 

 spreading or ascending, narrowed to 

 an involute point, glabrous or the 

 lower sparsely pilose, the middle 

 culm blades 4 to 6 cm. long, 2 to 5 



