132 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 



just below the apex of the lemma. These characters are not deemed 

 sufficient to separate it from our species. The rachilla is prolonged 

 in A. aequivalvis and a similar awn is found in the annual A. elliot- 

 tiana Schult. 



For a revision of the species of Agrostis found in the United States, 

 see Hitchcock, U. S. Dept. Agr., Bur. PL Ind. Bull. 68. 1905. 



57. PHIPPSIA (Trin.) 11. Br.' 



Spikelets 1-flowered, disarticulating above the glumes, the rachilla 

 not prolonged; glumes unequal, minute, the first sometimes wanting; 



lemma thin, somewhat 

 keeled, 3-nerved, acute; 

 pa lea a little shorter 

 than the lemma, dentate. 

 A dwarf, tufted per- 

 ennial, with n a r r o w, 

 few - flowered panicles 

 of small spikelets. Spe- 

 cies one, in the arctic 

 regions of both hemi- 

 spheres; also on the al- 

 pine summits of Colo- 

 rado. 



FIG. 70. Phippsia algida. Plant, X ; spikelet and 

 branchlet of inflorescence with the glumes of lower 

 spikelets remaining, and floret, all X 5. 



Type species : Agrostis 



Soland. 



( Nlpo<f,inin s 11 b,ge n u s 

 Phippsia Trin., in Spreng. 

 Neu. Entd. 2: 37. 1821. 



Phippsia R. Br., Suppl. App. Parry's Voy. 184. 1824. A single species de- 

 scribed, P. algida, based on Ayrostitt algida Soland. 



Phippsia algida (Soland.) R. Br. (fig. TO) 'is known in the United 

 States only from a few localities in the alpine regions of Colorado. 

 It was first described as Agrostis algida by Solander. 1 



58. COLEANTHUS Seidel. 



Spikelets 1-flowered; glumes wanting; lemma ovate, hyaline, 

 terminating in a short awn ; palea broad, 2-keeled. 



A dwarf annual, about an inch high, with short flat blades and 

 small few-flowered panicles. Species one, northern Eurasia, intro- 

 duced in America. 



Type species: Schmidtia subtilis Tratt. 



Schmidtia Tratt., Fl. Oesterr. Kaiserth. 1: 12, pi. 10, 1816, not Schmidtia 

 Moench, 1802. Only one species described. 



Coleanthus Seidel; Roem. and Schult., Syst. Veg. 2: 276. 1817. Only one 

 species described, C. xubtilis, based on &clinii<Iti<t xubtilix. 



i In Tliipps Voy. 200. 1810, 



