306 



Bulletin No. 205 



[March, 



Panicum microcarpon Muhl. 



(Fig. 70) 



Lapham '57, 548, 595; Patterson '76, 52; Flagg '78, 284; Brendel '87, 89; 

 Hitchcock and Chase '10, 181. 



Spring form growing in tufts or large clumps; culms generally 

 erect, sometimes bent at base, 1 to 2 feet long, the nodes bearded with 

 reflexed hairs ; sheaths smooth, except sometimes the lower ones, ciliate 

 along the margin ; blades thin, 4 to 5 inches long, 8 to 15 mm. wide, 

 smooth and glabrous except sometimes for a few hairs near the base ; 

 panicles many-flowered, oval in, outline; spikelets 1.5 to 1.6 mm. long, 

 glabrous. Autumnal form much branched, especially at the top, and 

 bent over from the weight of the branches; blades much smaller, 1 

 to 2.5 inches long, the panicle smaller and few-flowered. 



This species grows in wet woods and swampy places. The species 



described by Lapham was probably not P. microcarpon, as he says it 



resembles P. latifolium. His description is not complete enough to 



determine certainly what the species was, but it was probably P. 



polyantJies. \ 



ILLINOIS specimens: Without locality, Vasey. peoria co. Peoria, Brendel, 

 POPE CO. Herod, Clinton, July, 1898. wabash co. Without locality, Shearer, 

 Aug., 1899; Mt. Carmel, Schneck in 1880; Mt, Carmel, Waiie, Aug., 1887; near 

 Mt. Carmel, Schnccl', June, 1900; Shannon's swamp, Schneck, June, 1884. 



68 



70 



Figs. 68-71.— Spikelets: 68, P. harlndatum; 69, P. dichoiomvm; 70, P. 

 microcarpon; 71, P. yadkinense 



Panicum yadkinense Ashe 

 (Fig. 71) 



Hitchcock and Chase '10, 195. 



Vernal culms 2 to 3 feet tall ; smooth, the nodes not bearded ; 

 sheaths smooth, with pale, almost whitC; glandular spots; blades 

 smooth, 3 to 5 inches long, 8 to 11 mm. broad ; panicles larger than in 

 P. dicJiotomum; spikelets 2.3 to 2.5 mm. long, smooth. Autumnal form 

 considerably branched but never tree-like as in P. dicliotomum, the 

 leaves smaller but not much reduced. 



This is a considerably larger species than cither P. dicliotomum or 

 P. harhulatum and is easily recognized by its pointed spikelets. The 



