46 



GRASSES OF IOWA. 



duncles; rachis very narrow, somewhat tiexuose and triangular, scabrous. 

 Spikelets imperfectly 2 to 4-rowed, crowded or somewhat lax, 1 line 

 (2 mm.) long and nearly as broad, rounded at the apex, smooth, or the 

 larger glume minutely hairy near the margins above. Flowering glume 

 with a distinct depression on the back near the base. 



Pas pal urn ciliatifolium is local only in central and eastern Iowa. 

 Muscatine Island. 



DISTRIBUTION. 



Iozua. Muscatine 509 (Reppert) ; W. Iowa ( Burgess) ; Iowa 

 City (Hitchcock) ; Woodbine (Bessey) ; Johnson County (Macbride). 



North America. In dry soil of New Jersey, Pennsylvania, Mary- 

 land, Wisconsin (La Crosse, Pammel ) ; Iowa, Missouri (St. Louis, Eg- 

 gert) ; Kansas, near McDonald's Station, Florida (Baker), Alabama, 

 Texas and Tennessee (Carroll County (Eggert). 



ERIOCHLOA. 

 Eriochloa. H. B. K. Nov. Gen. et, Sp. PI 1: 94. 1815. 



Spikelets 1 -flowered, her- 

 maphrodite, rachilla articu- 

 lated below the empty 

 glumes, where it is expanded 

 into a distinct, ring-like cal- 

 lus. Empty glumes 2, nearly 

 equal, membranaceous, more 

 or less acuminate-pointed the 

 third or flowering glume 

 slightly indurated, mucro- 

 nate, or short awn-pointed ; 

 shorter than its glume. Sta- 

 mens 3. Styles distinct; 

 stigmas plumose. Caryopsis 

 included within the har- 

 dened fruiting glume, free. 

 Annual (?) or perennial 

 grasses, with usually thin flat 

 leaves and terminal panicles, 

 composed of numerous, some- 

 what one-sided racemes. 



Species 5 to b, in the sub- 

 tropical or warmer temper- 



F'O. 34. Eriochloa mollis 1. Spikel^-t, 2. Fourth a j- e j-etlions of both hemis- 

 glume. 3. Palea and pistil. 4. Third glume with 

 staminate flower. (Div. Agros. U. S. Dept. Agrl. pheres. 



