GRASSES OF IOWA. 175 



ceolate, acuminate, scabrous on the keels, otherwise smooth. Flowering 

 glume about three-fourths the length of the empty ones. Common in 

 damp places, in thickets and along the borders of woods. August to 

 October. 



DISTRIBUTION. 



Iowa'. It has not been reported to us from the state, though doubt- 



curring. 

 North America. Eastern Atlantic States, Kentucky (Harlan 

 County, Small), and Tennessee; northwest to Iowa and Minnesota. 



12. CALAMAGROSTIS. 



Calamagrostis Adans. Fam. PI. 2: 31. 1763. Endlicher. Gen.' PI. 90. 

 Bentham &- Hooker. Gen. PI. 3: 1150, 1152. Hackel in Engler and Prantl. 

 Nat. Pflanz. Fam. II. 2: 51. f. 34. Scribner. Bull. U. S. Dept. Agrl. Div. 

 Agros. 20: 82. f.6o. 



LachnagrostisTvln. Fund. Agr. 128. 1820. 



Achaeta Fourn. Gram. Mex. 109. 1880. 



Re /chela Stand.. Syn. PI. Glum. 1: 101. 1855. 



Cimiastrum Fourn. Gram. Mex. 90. 1880. 



Dciienxia Clarion in Beauv. Agros. 43: 1812. 



Spikelets 1 -flowered, and (in our species) often with a pedicel or 

 rudiment of a second abortive flower (rarely 2-flowered), in an open or 

 spiked panicle. Lower glumes mostly membranaceous, keeled or boat- 

 shaped, often acute, commonly nearly equal, and exceeding the flower, 

 which bears at the base copious, white, bristly hairs; flowering glume 

 thin, bearing a slender awn on the back or below T the tip, or sometimes 

 awnless; the palet mostly shorter. Stamens 3. Grain free. Perennials, 

 with running rootstocks, and mostly tall and simple, rigid culms. 

 (Name compounded of two Greek words for reed and grass.) 



Bentham and Hooker include under Calamagrostis and Deyeuxia 

 125 species, of which 5 belong to the genus Calamagrostis; Hackel rec- 

 ognizes 130 species; this includes the section of Epigeos of Koch with 

 10 species and Deyeauxia Beauv. with 1 20 species. The species are found 

 chiefly in the temperate and colder regions, and mountains of tropical 

 countries, bo species being found in the Andes region. Beal recognizes 

 26 species in North America, with six varieties ; Kearney recognizes 38 

 species and 16 varieties. 



