17 



Coville). Pennsylvania: Philadelphia (I. C. Martindale 15 ) . Delaware: Centre- 

 ville (A. Commons 135, 136). Maryland: Rocky Springs (J. E. Miller). District 

 of Columbia: Washington (G. Vasey); (T. H. Kearney, jr.). Florida: Chipley 

 (R. Combs 684). Alabama: Tuskegee (G. W. Carver). Tennessee: Hiwassee 

 Gorge (T. H. Kearney, jr. 311). Oliio: Pittsfield (A. E. Ricksecker); Yomigs- 

 town (R. H. Ingraham). Indiana: Millers (L. M. Umbach). Michigan: Thmader 

 Bay Island (C. F. Wheeler). Wisconsin: Near Webster (L. S. Cheney 3430). 

 Mmnesota: Wilmar (W. D. Frost); Cannon Falls (J. H. Sandberg 327). Iowa: 

 MiiieTva (C. R. Ball 9); Ames (C. R. Ball 35, 150); Newmarket (B. Shimek 12). 

 3Iissouri: St. Louis (Drummond 647). Texas: Ennis (J.G.Smith); El Paso (E. 



A. Mearnsl479, 1482). New Mexico: Cliff (J. K. Metcalfe). Arizona: Near Flag- 

 staff (D. T. McDougal 303). Utah: Provost (M. E. Jones 5499); Ogden (T. A. 

 Williams 2482); Salt Lake City (M. E. Jones 1009). Colorado: Estes Park (J. 

 Ball); near Silverton (C. L. Shear 1239). Wyoming: Near Beulah (David Grif- 

 liths405). Montana: Bozeman (P. A. Rydberg 2214; C. L. Shear 453); Garrison 

 (C. L. Shear 368). Idaho: Farmington Landing (Sandberg, Heller & McDougal 

 531); Forest (H. E. Brown 26). Washington: (Leiberg & Sandberg 399); Waits- 

 burg (R. M. Horner 564); Walla Walla (C. L. Shear 1557, 1597). Oregon.: 

 McMinnville (C. L. Shear 1618); Corvallis (M. Craig 9344). California: Dixie 

 Valley (J. B. Davy). 



This plant is very closely related to several other species, especially B. racemosus and 



B. arvensis. It differs from both in the character of the spikelet at maturity, the 

 florets being much spreading and the margin of the flowering glume being 

 strongly involute. 



2. BROMUS RACEMOSUS L. Sp. PI. ed. 2. 1 : 114. 1762. Serrafalcus racemosus 

 Pari. Rar. PL Sic. 2 : 14. 1840. (Fig. 2.) 



All annual or biennial, with erect or ascending culm 3-7 dm. high, usually scabrous- 



- . puberulentjust below the panicle and pubescent at the nodes. Sheaths rather densely 

 pilose-pubescent, at least the lower ones; ligule about 1 mm. long, lacerate-clentate; 

 blades linear, rather narrow, mostly 7-14 cm. long, pilose-pubescent below or on 

 both surfaces. Panicle typically simple sometimes with 2-3 branches below, mostly 

 somewhat nodduig. Spikelets 15-20 mm. long, usually drooping in fruit, at first 

 ovoid-lanceolate, becoming somewhat oblong-lanceolate, always acute, mostly 

 5-9-flowered; empty glumes broad, smooth or scabrous, the lowei 3-5-nerved, 

 5-6 mm. long, the upper broader, 6-7-nerved, 6-8 mm. long; flowering glume 

 ellii^tical, smooth, or scabrous, 7-nerved, 6-8 mm. long, very shortly bidentate at 

 the apex, with a straight awn 5-8 mm. long inserted about 1 mm. below the apex; 

 palea shorter than its glume. Introduced from Europe. 



Specimens examined. — Cape Breton Island: New Camisbelltoii (D. White and Chas. 

 Schubert 28) . Maine : Foxcrof t (M. L. Fernald 565) . Pennsylvania : Bucks Co. 

 (N. L. Britton); Philadelphia (C. E. Smith 41). Delaware: Centreville (A. 

 Commons 137) . 



The validity of this species is uncertain. The only thing in Linnteus's original descrip- 

 tion to distinguish it from other closely related forms is the following: ' ' Panicula 

 constat racemo simplici : ijedunculis alternis, saepius solitarius . . . ." 



We have for the present accepted the interpretation and emendation of the species as 

 given by Mertens and Koch in "Roehling'sDeutschlands Flora 1-: 681." These 

 authors state that the growing plant shows the greatest resemblance to B. mollis. 

 It differs from that species, however, in its smooth spikelets and looser panicle. 

 From B. secalinus it is said to always differ in the fruiting condition in having 

 the margins of the flowering glumes flat and overlapping, or but very slightly 

 involute toward the base, instead of having the florets spread and the margins 

 strongly involute. It is also said to flower earlier and have more pubescence on 

 20796— No. 23 2 



