84 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



7. Bromus aleutensis Triii.; Griseb. in Ledeb. Fl. Ross. 4: 361. 1853. 



A rather tall, stout perennial with lax, suberect panicles 12 to 20 cm. long, the lower 

 branches bearing 1 to 3 somewhat nodding spikelets 2.5 to 3.5 cm. long; lemmas about 

 15 mm. long, 7-nerved, smooth or scabrous-pubescent and with broad, membranous 

 margins. 



In damp soil, Aleutian Islands. 



Specimens examined: Atka Island, Turner 1194; Unalaska, Evans 550, Kellogg 

 142, Harrington in 1871-72, Coville <fc Kearney 1727, 2196, Applegate, Piper 4680, 4681. 



8. Bromus sitchensis Trin.in Bong. Mem. Acad. St. Petersb. VI. Math. Phys. Nat. 



2: 173. 1832. 



A tall, stout, leafy perennial 120 to 180 cm. high, with smooth sheaths and lax, 

 drooping panicles 25 to 35 cm. long, the lower branches 2 to 4, weak, spreading, usually 

 bearing 1 to 3 spikelets on long slender pedicles; spikelets 2.5 to 3 cm. long; lemmas 

 12 to 14 mm. long, smooth or scabrous. 



In damp soils near the coast, Aleutian Islands and southeastern Alaska to Oregon. 



Specimens examined: Yes Bay, Behm Canal, Howell 1722&; Unalaska, Kellogg 142 ; 

 Hope Island (southeast Alaska), Kellogg 143; Foggy Bay, near Cape Fox, Coville & 

 Kearney 2577; Sitka, Piper 4679. 



SPECIES OF BROMUS ERRONEOUSLY ASCRIBED TO ALASKA. 



Bromus purgans L., Bromus ciliatus L., and Bromus virens Nutt., have been reported 

 from Alaska in various published lists, but none of these species extend to Alaska. 

 Alaskan specimens referred to the two former species are Bromus pumpellianus, B. 

 patificus, or B. richardsonii, while that reported as Bromus virens is doubtless Bromus 

 aleutensis. Bromus virens Nutt. is a synonym of Bromus carinatus hookerianus (Thurb . ) 

 Shear, a form not found north of Washington. 



25. AGROPYRON Gaertn. 



Agropyron Gaertn. Nov. Comm. Petrop. 14 1 : 539. pi, 19. f. -',, 5. 1770. 



Spikelets 3 to many-flowered, closely sessile and solitary at each node of the axis; 

 rachilla articulated above the glumes and between the florets; glumes 2, usually 

 shorter than the lemmas, these rounded on the back or slightly keeled above, acute 

 or awned from the apex. Perennial grasses with erect simple culms and terminal 



spikes. 



Lemmas awnless, or if awned, the awn much shorter than the lemma. 

 Lemmas very densely villous. 



Plants glaucous; leaves involute, rigid; glumes gla- 

 brous or nearly so 1 . A. dasystachyum. 



Plants green; leaves flat; glumes strongly pilose 2. A. yukonense. 



Lemmas glabrous, scabrous, or short-pubescent, not densely 

 villous. 

 Nodes appressed-pubescent; lemmas sparingly strigose- 



pubescent ,. 3. A . alaskanum. 



Nodes glabrous; lemmas glabrous or pubescent. 



Lemmas densely short-pubescent 5a. A. v iolaceum 



latiglume. 

 Lemmas scabrous or glabrous. 



Spike relatively thick; internodes of the rachilla 



densely pubescent 5. .1. violaceum. 



Spike slender; internodes of the rachilla gla- 

 brous 4. A. tenerum. 



