37 



Tweedy a'i) ; Tongue River Basin (B. C. Bnffuni 5116) ; Hiilett (D. rT.(Triffiths924); 

 Big Horn INIountains ( \V. II. Forwood); Little Laramie River (T. A. Williams 

 2239); Seminole ^Mountains (E. Nelson 4931); Sand Creek (A. Nelson 1105); 

 In van Kara Creek (T. A. Williams 2581); Crazy Womans Creek (T. A. Williams 

 2734). Idaho: Beaver Canyon (P. A. Rydberg 2344) ; Snake River (G. W. Let- 

 terman 90). Ydloirxto)ie National Park: Yellowstone Lake (A. Nelson 6628); 

 Cash Creek (F. Tweedy 588). Montana: Spanish Creek Basin (T. A. Williams 

 2050); Northern Pacific R. R. (F. Lamson-Scribner) ; Lima (C. L. Shear 566; 

 P. A. Rydberg 2315); Barker (P. A. Rydberg 3361); Castle (P. A. Rydberg 

 3253); Spanish Creek (P. A. Rydberg 3047). .South Dakota: Rochford (P. A. 

 Rydberg 1165). Xorf}i_I)akota: Bottineau (M. A. lTrannon~79, 87, 92); Devils 

 Lake (C. A. Geyer). Manitoba: Brandon (J. Macoun 13049); Rapid City (J. 

 Macoun 13047). Asslnibola: Moose Jaw (J. Macoun 13043). Saskatchewan: 

 (J. Macoun 77). Alberta: Milk Rim Ridge (J. Macoun 13037). 

 This is the western expression of B. kalinil, and but for its geographical distribution, 

 I should be inclined to regard it as a variety of that species into which it passes 

 by way of ^linnesota and Canada. It is usually distinguished from that species 

 by its smooth, narrower leaves, and narrower, fewer-nerved, empty glumes. It 

 is also connected by intermediate forms wath B. richardsoni. 



19 <t. BROMUS PORTERI LANATIPES n. var. 



In its typical form this is a robust plant whose most striking character is its densely 

 soft-d(jwny or woolly sheaths. The leaves are scabrous both sides and larger than 

 in the species; the panicle mostly larger and denser with spikelets somewhat 

 larger and the empty glumes merely scabrous on the nerves or quite smooth. 



Type No. 739, collected by C. L. Shear, Idaho Springs, Colo. 



General distribution: Southern California, Arizona, New Mexico, and Colorado. 



Speci.mexs examined.— C'c(Z(/b)-« /a: San Bernardino Mountains (S. P. Parish 253 & 

 2533a; S. B. & W. F. Parish 1535). These specimens not typical. Arizona: Dos 

 Cabezas (J. D. Emersley) ; no locality (J. D. Emersley 8). Colorado: Boulder 

 (G. AV. Letterman 9) ; Idaho Springs (C. L. Shear 739; P. A. Rydberg 2490 & 

 2496); La Veta (C. L. Shear 811); Golden (G. W. Letterman 8) ; M. E. Jones 

 269) ; Trinidad (S. M. Tracy 12J) ; Walsenburg (C. L. Shear 799). 



This variety passes by various forms int9 the species. It also closely approaches 

 B. richardsoni. The specimens cited from southern California have the sheaths 

 less densely pubescent and approach B. hrvipes. 



19 /J. BROMUS PORTERI HAVARDII nom. nov. Bromvs ciliatus minor 

 Munro, Dewey in Cuntr. V. S. Nat. Herb. 2: 548. 1894. Not B. macranthus minor 

 Desv. 1853. 



An erect, rather densely tufted plant, glaucous and nearly smooth throughout. Spike- 

 lets 15-18 mm. long; empty glumes unequal, the lower 1-nerved 3-5 mm. long, the 

 upper 3-nerved, 5-6 mm. long, flowering glume 7-8 mm. long. Awn about 2 mm. 

 long. This differs from the species in its glaucous more rigid leaves and smaller, 

 somewhat more coarsely pubescent spikelets. 



Type No. 20, collected by V. Havard, slopes of Chisas Mountain, Vieja Mountain, 

 west Texas. 



19 ;'. BROMUS PORTERI ERONDOSUS n. var. (Fig. 20.) 

 A slender, weak, erect or ascending, somewhat tufted perennial, about 6-9 dm. 

 high. Culm smooth, leafy. Sheaths smooth; ligule about 1 mm. long, truncate 

 and irregularly dentate; blade>^ linear, weak, mostly 1-2 dm. long and 3-4 mm. 

 wide, smooth throughout. Panicle 1-2 dm. long, very n-eak and drooping; lower 

 branches 2-4. Spikelets 2-2.5 cm. long, 7-11-flowered, oblong-lanceolate in 

 flower, pale green and drooping; empty glumes 3-nerved, smooth, mostly acute, 



