Panicum 



Paniceae 



161 



50 



Map 287 



Panicum xalapense H.B.K. 



12. Panicum perlongum Nash. Map 284. This is an infrequent species 

 in the sand areas of the northern part of the state. It is found in very 

 dry soil on the crests of open dunes and on sandy knolls and ridges, some- 

 times in dry, sandy prairies. 



Ind. to Man. and N. Dak., southw. to Colo, and Tex. 



13. Panicum linearifolium Scribn. Map 285. Infrequent in the un- 

 glaciated area of the southern part of the state and in sandy habitats of 

 the lake area. In the south it is found in open woodland on the crests of 

 ridges, and in the lake area it is found in dry, sandy soil on open dunes, 

 sandy knolls, and sandy ridges. 



Que., Maine, and Mich., southw. to Ga. and Tex. 



13a. Panicum linearifolium var. Werneri (Scribn.) Fern. (Rhodora 23: 

 194. 1921.) {Panicum Werneri Scribn.) Map 286. This variety is found 

 with the species but is less frequent, especially in the northern part of 

 the state. 



Que., Maine to Minn., southw. to Va., Ky., and Tex. 



7. LAXIFLORA 



Vernal culms 15-50 cm high, tufted, erect to spreading; foliage aggre- 

 gated toward the base, not in distinct rosettes in autumn; blades pilose 

 on one or both surfaces or nearly glabrous, usually short-ciliate ; ligules 

 nearly obsolete; panicles sometimes reduced and exceeded by the leaves; 

 spikelets pilose, 1.8-2 mm long. 



14. Panicum xalapense HBK. {Panicum laxiflorum of Britton and 

 Brown, Illus. Flora, ed. 2, not Lam.) Map 287. An infrequent species in 

 the area shown on the map. It is usually found on wooded slopes, most 

 often at their bases. 



Md. to 111. and Mo., southw. to Fla., Tex., Mex., and Guatemala; also 

 in Santo Domingo. 



