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



to 40 cm long, the slender, remote branches somewhat spreading, 

 bearing short mostly appressed branchlets with rather crowded some- 

 what curved subsecund spikelets, set obliquely on their pedicels; 

 spikelets 3.4 to 3.8 mm long. 01 — Moist sandy soil, New Jersey 

 to Kansas, south to Florida and Texas (fig. 1531). 



153. Panicum rhizomatum Hitchc. and Chase. (Fig. 1532.) 

 Resembling P. anceps; culms less robust, the rhizomes more slender 

 and numerous; sheaths densely to sparsely villous, especially at the 



summit ; blades usually pubescent 

 on both surfaces; panicles more 

 or less contracted; spikelets 2.4 

 to 2.8 mm long. Ql — Moist 

 sandy woods and savannas, 

 Coastal Plain, Maryland to Flor- 

 ida and Texas (fig. 1533). 

 11. Laxa.— Slender perennials; 

 culms compressed; ligules 

 minute; spikelets short- 

 pediceled, 5-nerved, glabrous, 

 the palea of the sterile floret 

 becoming enlarged and in- 

 durate, expanding the spike- 

 let at maturity; fruit min- 

 utely papillose-roughened, 

 relatively thin in texture. 

 154. Panicum Mans Ell. (Fig. 

 1534.) Culms 20 to 60 cm tall, 

 mostly erect, sometimes more or less decumbent, or prostrate with 

 erect branches; blades 5 to 15 cm long, 1 to 5 mm wide, flat or folded, 

 pilose on the upper surface near base ; panicles 5 to 20 cm long, usually 

 loose and open, the primary branches few, slender, distant, spreading 

 or drooping, the branchlets borne on the upper half or towards the 

 ends only; spikelets in more or less secund clusters, 2.2 to 2.4 mm 

 long, at maturity about twice as thick as wide. 01 — Damp soil 



Figure 1520.— Panicum agrostoides. Panicle, 

 X 1; two views of spikelet, and floret, X 10. 

 (Fisher 30, N.J.) 



Figure 1521. — Distribution of 

 Panicum agrostoides. 



Figure 1522.— Panicum 

 condensum. Two views 

 of spikelet, and floret 

 X 10. (Type.) 



Figure 1523.— Distribution of 

 Panicum condensum. 



along ponds and streams, North Carolina to Florida and Texas, 

 thence north to Oklahoma and southern Missouri; Mexico (fig. 1535). 

 12. Verrucosa. — Glabrous branching annuals; culms slender, weak, 

 decumbent at base, usually with stilt-roots; ligules minute; 

 panicles with divaricate capillary branches, spikelet-bearing 

 toward the ends, the spikelets mostly in twos; spikelets tubercu- 

 late, nerves obscure or obsolete ; first glume minute ; fruit minutely 

 papillose, margin of the lemma inrolled only at base. 



