170 



Paniceae 



Panicum 



Panicum tsuqetorum Nash 



o 50 



Map 312 



Panicum columbianum Scribn 



Starke County. They were found in dry, sandy soil in a flat, black and 

 white oak woods where they were closely associated with Panicum Deamii. 



In 1938 I found it in Steuben County. 



Maine to N. C. ; Ind. 



13. SPHAEROCARPA 



Culms glabrous ; ligule obsolete or nearly so ; blades cordate and ciliate 

 at the base; spikelets obovoid-spherical at maturity; second glume and 

 sterile lemma 5-7-nerved; autumnal form remaining simple or but spar- 

 ingly branching; the thick, white-margined blades of the winter rosette 

 conspicuous. 



Upper three blades usually 10-20 cm long and 10-25 mm wide, the upper blade usually 

 not much smaller than the other two, the blades below the three usually much 

 smaller than the upper three; anthers mostly 0.4-0.5 mm long.. .39. P. polyanthes. 



Upper three blades usually 5-10 cm long and 7-14 mm wide, the upper one usually 

 much reduced, the blades below the three upper ones usually not reduced; anthers 

 mostly 0.6-0.8 mm long 40. P. sphaerocarpon. 



39. Panicum polyanthes Schultes. Map 313. This species is restricted 

 to the southern half of the state and is rather frequent in the counties 

 along the Ohio River. It prefers a slightly acid soil and is found in dry 

 soil associated with black oak, and in moist soil associated with sweet gum. 

 It is also found sparingly in fallow fields. 



Conn., Ind. to Okla., southw. to Ga. and Tex. 



40. Panicum sphaerocarpon Ell. Map 314. This species is infrequent 

 in the lake area and reappears in the unglaciated area where it is rather 

 local. In the lake area it is found in very dry, sandy or gravelly places 

 and in the southern part of the state on black oak and black and white 

 oak ridges. 



This species much resembles the preceding from which it may easily be 

 separated by its larger anthers and usually much reduced upper leaf. It 

 also much resembles Panicum microcarpon which has the nodes of the 



