648 



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



2.5 mm. long, (or before maturity to 

 3 mm. long), commonly somewhat 

 twisted, pointed beyond the fruit, 

 minutely pubescent; fruit 1.6 to 1.7 

 mm. long. Autumnal phase erect or 

 top-heavy reclining, freely branching, 

 the slender involute blades scarcely 

 reduced; panicles reduced, few-flow- 

 ered, obscured by the foliage. % 

 — Known only from open pine woods 

 near Bonita Springs, Lee County, 

 Fla. 



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Figure 929. — Panicum fusi forme. Two views of spike- 

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



20. Panicum fusiform e Hitchc. 

 (Fig. 929.) Vernal culms erect, 30 to 

 70 cm. tall, the basal and lower 

 sheaths and lower surface of blades 

 softly pubescent; panicle loose, the 

 lower branches spreading or droop- 

 ing; spikelets 3.3 to 3.5 mm. long, el- 

 liptic, acutish or beaked beyond the 

 fruit, long-attenuate at base, papil- 

 lose-villous. Autumnal phase bushy, 

 the blades soon involute, 3 to 5 cm. 

 long. % — Sandy pine woods, Vir- 

 ginia to Florida and Mississippi; 

 West Indies; British Honduras. 



21. Panicum arenicoloides Ashe. 

 (Fig. 930.) Vernal phase intermediate 

 between that of P. angustifolium and 

 P. adculare; culms 30 to 50 cm. tall; 

 lower sheaths and blades softly vil- 

 lous; blades 7 to 12 cm. long, 3 to 4 

 mm. wide, apex subinvolute; panicle 

 -1 to 6 cm. long, the lower branches 

 ascending; spikelets 2.1 to 2.5 mm. 

 long, obovate, papillose-pilose. Au- 

 tumnal phase bushy-branching, erect 

 or top-heavy, the blades involute. 

 01 — Sandy pine woods, Coastal 

 Plain, North Carolina to Florida, Ar- 

 kansas, and Texas; Cuba; Guate- 

 mala; northern South America. 



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Figure 931. — Panicum ovinum. Two views of spike- 

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



22. Panicum ovinum Scribn. and 

 Smith. (Fig. 931.) Vernal culms erect 

 or nearly so, not densely tufted, gla- 

 brous, 30 to 50 cm. tall; sheaths gla- 

 brous or the lowermost appressed- 

 pubescent; blades erect or ascending, 

 10 to 15 cm. long, 3 to 6 mm. wide, 

 glabrous; panicle 5 to 9 cm. long, the 

 lower branches ascending; spikelets 

 2.1 to 2.2 mm. long, papillose-pubes- 

 cent, sometimes minutely so. Autum- 

 nal phase -erect or nearly so, the 

 blades loosely involute. % — Dry 

 or moist open ground, Mississippi to 

 Arkansas and eastern Texas; Mexico. 



Figure 930. — Pci}ucum arenicoloides. Two views of 

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



Figure 932. — Panicum neuranthum. Two views of 

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



23. Panicum neuranthum Griseb. 

 (Fig. 932.) Vernal phase glabrous as 



