GRAPHEPIIORUM. 163 



2. T. Purpurea, Gray (Sand Grass). Is fonnd on 

 same soils as the above, from 6 inches to a foot high- 

 Acid to the taste. Flowers from August to Sep- 

 tember. 



3. T. Cornuta (Horned Sand Grass). Another 

 species found at the South. Of no agricultural 

 value. 



26. GKAPHEPHORUM Desv. DUPONTIA, R. BE. 



GENERIC CHARACTER. 



Spikelets 2 to 5-flowered, rather terete. Glumes 

 membranaceous, mostly nearly equalling the remote 

 flowers. A cluster of villous hairs at the base of 

 each flower. Palets thin and membranaceous or sea- 

 rious, the lower one convex, scarcely keeled, faintly 

 nerved, entire, pointless, and awnless. Stamens 3. 

 Stigmas plumose. Ovary glabrous. Perennial and 

 northern or arctic grasses, with linear flat leaves, 

 their sheaths closed at the base, the spikelets in a 

 loose panicle. 



Genus allied to the A venae, but awnless ; named 

 from grapTiis, a pencil, and phero, to Ibear, from the 

 tufts of hair at the base of the flowers. 



1. G. Melicoides, Beauv. Stem 1 to 2 feet high. 

 Found at Grand Detour, Michigan, shore of Moose- 

 head lake, Maine, and northward. 



2. G. Major, Gray (Large G. Grass or Dupontia 

 Grass). Grows 2 to 3 feet high. Found in Macomb 

 county, Michigan. 



