304 Bulletin No. 205 [March, 



and eulms in this group are never conspieuously pubescent, and the 

 ligules are very short, less than 1 mm. in length, and fringed. The 

 spikelets are never over 2.5 mm. in length. 



Panicum barbulatum Miclix. 

 (Fig. 68) 



Vernal culms 1 to 2.5 feet tall, the lower nodes bearded; sheaths 

 shorter than the internodes, but usually more than half as long, some- 

 times with a few soft hairs ; blades 2.5 to 4 inches long, 6 to 10 mm. 

 wide; panicles borne well above the leaves; spikelets 2 mm. long, 

 smooth, the second glume always covering the ripe fruit. Autumnal 

 culms branched rather more than in P. dicJiotomum and usually reclin- 

 ing, being too top-heavy to stand erect. 



This species is found in sterile soil, usually in the woods. In its 



vernal phase it closely resembles P. dicliotommn, but it always has 



bearded nodes. 



JACKSON CO, Makanda, Seymour, Aug., 1880. peoria co. Peoria, Brendel. 

 WABASH CO. Belmont, ScluiecJc, Oct., 1900. 



Panicum dichotomum L. 



(Figs. 67 and 69) 



Lapham '57, 596 (Plate 4, Fig. 4); Babeock '73, 97; Patterson '76, 52; 

 Flagg '78, 284; Higley and Eaddin '91, 139; Huett '97, 128; Hitchcock and 

 Chase '10, 190. 



Vernal culms 1 to 2 feet long, smooth and glabrous, the nodes 

 not bearded, but sometimes, especially the lower ones, with a few hairs; 

 sheaths less than half as long as the internodes, smooth or sparsely 

 pubescent, leaves 2 to 4 inches long, 4 to 8 mm. wide, usually smooth 

 but sometimes with a few long hairs along the edges ; panicles borne 

 well above the leaves, small and few-flowered; spikelets 2 mm. long, 

 smooth, the second glume always shorter than the fruit when ripe. 

 Autumnal culms much branched from about the middle, the lower por- 

 tion usually unbranched, making the plant look like a small tree; 

 blades much smaller than in the vernal form. 



This species is often purplish in both vernal and autumnal forms. 

 The vernal form closely resembles P. harhulatum, but this species has 

 bearded nodes and the fruit is always covered by the second glume. 

 The species described and figured by Lapham was evidently not P. 

 dicliotomum as it was densely pubescent, while this species is smooth. 



ST. CLAIR CO. Mascoutah, Welsch. union CO. Cobden, Waite in 1885. 



