Panicum 



Paniceae 



169 



o 58 



Map 308 



Panicum pseudopubescens Nash 



o— — If 

 Map 310 



Panicum Add isonii Nash 



extend its range to a few adjoining counties. It grows in very dry, sandy 

 soil in the open on knolls, dunes, and ridges, where it is usually associated 

 with black and white oak. 



Conn, to Wis., southw. to Fla., Miss., Mo., and Kans. 



12. COLUMBIANA 



Culms tufted, stiff, crisp-puberulent to appressed-pubescent ; ligules 

 usually less than 1 mm long, rarely longer; blades firm; spikelets pubes- 

 cent; branches and blades of the autumnal phase appressed or ascending. 



Spikelets 2-2.9 mm long; sheaths usually copiously pilose, short hairs few or lacking. 



Spikelets mostly 2.8-2.9 mm long; vernal blades 7-15 cm long 35. P. Deamii. 



Spikelets mostly 2-2.2 mm long; vernal blades usually all less than 8 cm long 



36. P. Addisonii. 



Spikelets 1.5-1.9 mm long; sheaths sparingly pilose but densely pubescent with short, 

 appressed hairs. 



Spikelets 1.8-1.9 mm long 37. P. tsugetorum. 



Spikelets 1.5-1.7 mm long 38. P. columbianum. 



35. Panicum Deamii Hitchc. & Chase. Map 309. Local in a few of the 



northwestern counties, where it is found on open, wooded dunes and sandy 

 knolls. 



Ind. and Iowa. 



36. Panicum Addisonii Nash. Map 310. Local in our northern counties, 

 Adhere it is found in dry sand on open, wooded dunes and sandy knolls. 



Coastal Plain, Mass. to S. C. ; Ind. 



37. Panicum tsugetorum Nash. Map 311. This is another Panicum 

 which is restricted to the northern part of the state and is found in dry, 

 sandy or gravelly soils on wooded slopes and dunes. It is included by some 

 authors with Panicum columbianum Scribn. 



Maine to Wis., southw. to Ga. and Tenn. 



38. Panicum columbianum Scribn. Map 312. My only specimens are 

 from the H. H. Peele woods abouc a mile and a half southwest of Knox, 



