54 



GRASSES OF IOWA. 



Tenn. Aer. Exp. Sta. 7: 39. f. 28. 1894. Scribner and Merrill, Rhodora, 

 3: 98. Beal. Grasses of N. A. 2: 109. 1896. 



Pas palnm fill forme Sw. Prodr. 22. 1788. 



SyntherismavillosaWa.lt. PI. Car. 77. 1788. 



Syntherisma filiformis Nash. Bull. Torr. Bot. Club. 22: 420. 1895. 



Syntherisma filiformis (L) Nash. Nash in Britton and Brown. 111. Fl. 

 1: 111. f.242. 1896. 



Digitaria filiformis Muhl. Gram. 131. 1817. 



DESCRIPTION*. 



Slender Crab Grass. A 

 slender annual resembling 

 crab grass somewhat in habit, 

 but branching only near the 

 base, less leafy, leaves usually 

 erect, racemes less spreading 

 and more slender, the axis 

 being nearly filiform. Dis- 

 tinguished from P. glabrum 

 at once by its more slender 

 culms, pubescent or nearly 

 hirsute lower leaf-sheaths, 

 and more slender and less 

 spreading racemes. The spike- 

 lets are also smaller, scarcely 

 exceeding § lines (ii mm.) in 

 length. In this species the 

 first glume is usually wholly 

 wanting. Dry sandy soil. July 

 to September. 



Panicum filiforme occurs 

 chiefly in southeastern Iowa. 

 Has been found on the sandy 

 bluffs along Pine Creek, 

 Muscatine County. It has 



Fid. 39. Panicum filiforme.— a, Spikelets on been found once in Story 

 rachis; 6, e, >'. e, parts of flowers displayed. _, 

 (Charlotte M. King.) County. 



DISTRIBUTION*. 



Iowa. Wild Cat Den (Pammel); Muscatine (Reppert); Ames 



( Hitchcock). 



