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



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

 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. 2J. 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, 21 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 hians 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, NJ.) 



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. 



