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



P. tsugetorum and P. oricola); 

 blades firm, thick, stiffly ascend- 

 ing; spikelets 5- to 9-nerved, pu- 

 bescent, the first glume mostly 

 one-third to half as long as the 

 spikelet. Autumnal culms freely 

 branching, the branches and stiff 

 blades mostly appressed. 

 65. Panicum malacon Nash. (Fig. 

 974.) Vernal culms erect to stiffly 

 spreading, purplish olive green; culms 

 and sheaths appressed-pubescent, the 

 culms 30 to 50 cm. tall; blades 3 to 5 

 mm. wide, sharply acuminate, pu- 



Figure 972. — Panicum scoparioides. Two views of 

 spikelet, and floret, X 10. (Type.) 



culms erect or spreading, sparingly 

 branching from the upper and middle 

 nodes. % — Dry sandy or gravelly 

 soil, Vermont to Delaware; Indiana 

 and Michigan to Minnesota, Iowa, 

 and Kansas. 



Figure 973. — Panicum shastense. Two views of spike- 

 let, and floret, X 10. (Type.) 



64. Panicum shastense Scribn. and 

 Merr. (Fig. 973.) Vernal culms 30 to 

 50 cm. tall, pilose with ascending 

 hairs, the nodes short-bearded; 

 sheaths papillose-pilose, the hairs 

 spreading; ligule sparse, 2 to 3 mm. 

 long; blades 6 to 8 mm. wide, sparsely 

 pilose on the upper surface, pilose be- 

 neath; panicle 6 to 8 cm. long; spike- 

 lets 2.4 to 2.6 mm. long. Autumnal 

 culms spreading, with geniculate 

 nodes and elongate arched internodes, 

 rather sparingly branched from the 

 middle nodes. % — Moist mead- 

 ows. Known only from Castle Crag, 

 Shasta County, Calif. 



9. Columbiana. — Culms and sheaths 

 appressed-pubescent to crisp- 

 puberulent, the culms stiff; 

 ligules mostly less than 1 mm. 

 long (sometimes to 1.5 mm. in 



Figube 974. — Panicum ynalacon. Two views of spike- 

 let, and floret, X 10. (Type.) 



berulent beneath, puberulent to gla- 

 brous above; panicle 4 to 7 cm. long, 

 the branches few, stiffly ascending, 

 the pedicels long and stiff; spikelets 

 3 to 3.2 mm. long, obovate, the first 

 glume distant, about half as long as 

 the spikelet. Autumnal culms subde- 

 cumbent-spreading, branching from 

 the lower and middle nodes, the 

 branches appressed. 91 — Dry pine 

 woods, high pineland, North Carolina 

 (Wilmington); Georgia and Florida; 

 Texas. 



Figure 975. — Panicum deamii. Two views of spike- 

 let, and floret, X 10. (Type.) 



