192 GRASSES OF IOWA. 



DISTRIBUTION. 



Iowa. Ames, 143 (Ball, Sirrine, P. H. Rolfs, Van Cleve, War- 

 den. 



North America. Widely introduced on the Pacific and Atlantic 

 coasts; from New England, District of Columbia (Washington), North 

 Carolina (Small and Heller) to Georgia; east to Tennessee and south 

 to Alabama; occasionally north in Wisconsin, Michigan and the Rocky 

 Mountain region; common on the Pacific coast; Colorado (Ft. Col- 

 lins, Crandall). 



General. Europe, northern Africa, western Asia, said to be a 

 troublesome weed in Great Britain. 



4. DANTHONIA. 



Danthonia D. C. Fl. Fr. 3: 32. 1805. Endlicher. Gen. PI. 97. Be^tham 

 and Hooker. Gen. PI. 3: 1162. Hackel in Engler and Prantl. Nat. Pflanz. 

 Fam. II. 2: 56. 



Pentameris Beauv. Agros. 92. ]812. Scribner. Bull.U.S.Der. t.Agrl. Div. 

 Agros. 20: 96./. 72. (Rev. ed.) 



Streblochaeta Hochst. PI. Schirnp. Abyss, n. 412. 1835. 



Iriaphis Nees. PI. Afr. Austr. Glum. 270. 1841. 



ChaetobromusNees. Lindl. Ind. Nat. Syst. 449. 1835. (2ed.) 



Flowering glume oblong or ovate, rounded, cylindriceous, 7 to 

 9-nerved, bearing, between the sharp-pointed or awn-like teeth of the tip, 

 an awn, usually composed of the three middle nerves, which is flattish 

 and spirally twisting at the base ; otherwise as in Avena. Empty glumes 

 longer than the imbricated flowers. Ours perennial, 1 to 2 feet (2-5 

 dm.) high, with narrow and soon involute leaves, hairy sheaths bearded 

 at the throat, and a small, simple panicle or raceme of about 1 -flowered 

 spikelets. (Named for Danthoine, a French botanist.) 



Bentham & Hooker give the number of species at 100; the same 

 number is given by Hackel. In the temperate and warmer regions of 

 both hemispheres; more than half are native to South Africa, of which 

 Beal describes 7 ; native to Australia 7. 



1. DANTHONIA SPICATA. 



Danthonia spicata Beauv. in R. and S. Syst. 2: 690. 1817. Watson 

 and Coulter. Gray. Man. Bot. 654.//. 12. f. 1-3. 1890. (6ed.) Scribner. 

 Grasses of Tenn. Bull. U. S. Dept. Agrl. Div. Agros. 7: 85./. 113. 1894. 



Danthonia spicata (L.) Beauv. Beal. Grasses of N. A. 2: 391./. 68. 

 1896. Nash in Britton and Brown. 111. Fl. 1: 174. /. 397. 1896. Scribner. 

 Bull. U. S. Dept. Agrl. Div. Agros. 1: 7: 174. /. 168. 1900. (3 ed.) 



Avena spicata L. Sp. PI. 119. 1753. 



