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



cm long, one-fourth to half as wide, densely flowered; spikelets 1.5 

 to 1.6 mm long, minutely puberulent. Autumnal phase remaining 

 erect, producing simple branches from the lower and middle 

 nodes. 91 Damp ground, woods, and openings, Connecticut to 

 Oklahoma, south to Georgia and Texas (fig. 1397). 



72. Panicum erectifolium Nash. (Fig. 1398.) Vernal culms 30 

 to 70 cm tall, erect or ascending; sheaths usually crowded at base; 

 ligule very short; blades 7 to 13 cm long, 6 to 12 mm wide, the crowded 

 lower ones usually much larger than the others; panicle 6 to 12 cm 

 long, rather narrow, densely flowered, spikelets 1 to 1.2 mm long, 

 nearly spherical, densely puberulent. Autumnal culms remaining 



FIGURE 1398. Panicum erecti- 



FIGURE 1397. Distribution of folium. Two views of spike- FIGURE 1399. Distribution of 



Panicum polyanthes. let, and floret, X 10. (Type.) Panicum erectifolium. 



erect, late in the season producing branches from the third or fourth 

 node, the branches nearly as long as the primary culms. Qj. 

 Moist pine barrens, swamps, and borders of ponds, North Carolina to 

 Florida and Louisiana ; Cuba (fig. 1399). 



11. Ensifolia. Low and slender, mostly glabrous throughout (except 



in P. curtifolium and P. tenue)', ligules nearly obsolete; spikelets 



5- to 7 -nerved. Autumnal culms simple to freely branching. 



73. Panicum tenue Muhl. (Fig. 1400.) Vernal phase olive green; 



culms 20 to 55 cm tall, sometimes sparsely appressed-pubescent below; 



sheaths puberulent between the nerves or sparsely appressed-pilose, 



or the upper glabrous; blades distant, 2 to 5 cm long, 3 to 4 mm wide, 



FIGURE 1400. Panicum \\\ \f \$ FIGURE 1402. Panicum 



tenue. Two views of spike- albomarginatum. Two 



let, and floret, X 10. FIGURE 1401. Distribution of views of spikelet, and floret, 



(Type.) Panicum tenue. X 10. (Tj^pe.) 



rather thick, the margin cartilaginous, puberulent beneath, glabrous 

 on the upper surface; panicle 3 to 5 cm long; spikelets 1.6 to 1.7mm 

 long, puberulent. Autumnal culms erect or leaning, sparingly 

 branching from the middle nodes, the branches in small fas- 

 cicles. 21 Moist sandy woods, eastern North Carolina to north- 

 ern Florida (fig. 1401). 



74. Panicum albomarginatum Nash. (Fig. 1402.) Vernal culms 

 15 to 40 cm tall, ascending or spreading; leaves crowded at the base; 

 blades thick and firm, those of the midculm 4 to 6 cm long, 4 to 6 mm 

 wide, with a prominent white cartilaginous margin, the uppermost 

 much reduced; panicle 3 to 6 cm long; spikelet 1.4 to 1.5 mm long, 

 puberulent. Autumnal culms spreading, branching at the base, 



