132 BULLETIN ‘72, 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. ellzot- 
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. Purppsia (Trin.) R. 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; 
palea a little shorter 
than the lemma, dentate. 
A dwarf, tufted per- 
ennial, with narrow, 
few - flowered panicles 
of small spikelets. Spe- 
cies one, in the arctic 
regions ef both hemi- 
spheres; also on the al- 
pine summits of Colo- 
rado. 
; Type species: Agrostis 
Fig. 70.—Phippsia algida. Plant, X 4; spikelet and algida Soland. 
branchlet of inflorescence with the glumes of lower Colpodium subgenus 
spikelets remaining, and floret, all x 5. 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 Agrostis algida Soland. 
Phippsia algida (Soland.) R. Br. (fig. 70) 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.* 
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-fiowered panicles. Species one, northern Eurasia, intro- 
duced in America. 
Type species: Schmidtia subtilis Tratt. 
Schmidtia Tratt., Fl. Oesterr. Kaiserth. 1: 12, pl. 10, 1816, not Schmidtia 
Moench, 1802. Only one species described. i 
Coleanthus Seidel; Roem. and Schult., Syst. Veg. 2: 276. 1817. Only one 
species described, C. Subtilis, based on Schmidtia subtilis. 
1In Phipps Voy. 200. 1810, 
