82 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Festuca ovina brachyphylla. Festuca rubra glabra Trautv . , reported from Port Clarence 

 by Kjellman « is probably only a glabrous form of Fcstuca rubra. 



24. BROMUS L. 

 Bromus L. Sp. PI. 70. 1753. 



Spikelets few to many-flowered, more or less compressed, usually paniculate; 

 rachilla articulated above the glumes and between the florets; lemmas keeled or 

 rounded on the back, usually awned from the apex. Annual or perennial grasses 

 with flat leaves and rather large, erect or nodding spikelets. 

 Panicles erect or nearly so. 



Lemmas conspicuously pilose or pubescent. 



Glumes glabrous or scabrous; lemmas pubescent only 



^ along the margins and at the base 5. B. pumpellianus. 



Glumes pubescent and also the lemmas. 



Lemmas 12 to 14 mm. long; plants perennial (i. B. arcticus. 



Lemmas 8 to 11 mm. long; plants annual 2. B. hordeaceus. 



Lemmas glabrous or merely scabrous. 



Lemmas 6 to 8 mm. long, glabrous ] . B. racemosus. 



Lemmas about 15 mm. long, scabrous -. B. aleutensis. 



Panicles nodding. 



Lemmas glabrous or scabrous S. B. siichensis. 



Lemmas conspicuously pilose or pubescent. 



Lemmas pubescent throughout; glumes pubescent 4. B. pacificus. 



Lemmas pubescent only along or near their margins, and 



at the base; glumes not pubescent :j. B, nchardsonii 



I. Bromus racemosus L. Sp. PI. ed. 2. 114. 1762. * 



An erect or ascending annual or biennial 30 to 70 cm. high with usually densely 

 pilose-pubescent sheaths, simple panicles and acute 5 to 9-flowered spikelets 15 to 20 

 mm. long; lemmas elliptical, glabrous or scabrous, 6 to 8 mm. long, bearing a straight 

 awn 5 to 8 mm. long; palea shorter than the lemma. 



Sparingly introduced in various localities in North America, native in Europe and 

 Asia. 



Specimens examined: We have seen' no specimens of this grass from Alaska. It 

 is, however, reported b as introduced at Dawson and collected b V R S Williams 

 in 1899. 



2. Bromus hordeaceus L. Sp. PI. 77. 1753. 



Bromus mollis L. Sp. PI. ed. 2. 112. 1762. 



An erect or ascending annual, 20 to 80 cm. high, with flat, pubescent leaves and 

 short and rather dense, erect panicles; sheaths retrosely pubescent with soft hairs; 

 leaf blades 5 to 15 cm. long, 3 to 5 mm. wide; panicle contracted, 5 to 10 cm. long; 

 spikelets ovate-lanceolate, 5 to 15-flowered; glumes broadly ovate, obtuse, coarsefy 

 pilose-pubescent; lemmas 8 to I I mm. long, pilose, bearing a rather stout'awn 6 to 

 9 mm. long. 



Introduced at Yakutat in Alaska anil in fields and waste places throughout the 

 United States; native of Europe. 



Specimen examined: Yakutat, introduced, Piper 4683. 

 3. Bromus richardsonii Link, Hort. Berol. 2: 281. 1833. 



Bromus purgans longispimta Hook. Fl. Bor. Amer. 2: 252. 1840. 



An erect, robust perennial 60 to 130 cm. high with smooth culms, smooth or pilose 

 sheaths and diffuse nodding panicles, 15 to 25 cm. long; spikelets 2 to 3 cm. long; 



"In Nordenskiold, Vega-Exped. 2: 54. 1883. 

 b Nash, Bull. N. Y. Bot. Gard. 2: 158. 1901. 



