The following specimens are also referable to this species, although they differ 

 in several minor respects from the type: Chipias, Mexico, No. 3131 (in part) 

 E. W. Nelson, September, 14, 1895; Oaxaca, No. 1259 E. W. Nelson, Sep- 

 tember 38, 1894; Mexico, No. 201, E. Palmer, 1896. 



This species is closely related to Bouteloua hirsuta (H. B. K. ) Lag., but is at 

 once distinguished by its usually greater size, more numerous spikes, longer 

 leaves, and especially by its densely hirsute culms. 



DANTHONIA AMERICANA Scribn. nom. nov. {Danthonia grandiflora 

 Philippi, Anal. Univ. Chil. 568 (1873). Not Hochst. ex. A. Rich. Tent. Fl. 

 Abyss. 2:418. 1851. 



A slender, densely caespitose perennial 2-4 dm. high, with short, slightly inflated 

 sheaths, narrow mostly involiite leaves and simple panicles of 1-4 large 

 spikelets. Culms and nodes very smooth ; sheaths much shorter than the 

 internodes, pilose-pubescent, at least the lower ones, long bearded at the 

 throat ; culm leaves 3-7 cm. long, 1-2 mm. wide, mostly involute, the lower 

 ones sparingly pilose ; leaves of the innovations involute-filiform, 8-10 cm. 

 long, pilose with long spreading hairs. Axis of the panicle and pedicels 

 puberulent. Spikelets 12-18 mm. long; empty glumes as long as or slightly 

 exceeding the florets, lanceolate-acuminate, the narrowed apex obtuse, 

 7-9 nerved ; flowering ghame exclusive of the awn and teeth 6-8 mm. long, 

 rounded and glabrous on the back, densely silky villous along the margins 

 from just above the base to a little above the middle, the hairs crowded in 

 little tufts, broadest above the middle, abruptly 2-toothed, teeth very slen- 

 der, bristle-form 4-6 mm. long; callus narrow, about 1 mm. long, barbate, 

 the hairs from 0.5 to nearly 3.5 mm. long; awn very slender, twisted below, 

 7-9 mm. long. Palea rather broad, about 6 mm. long, shortly ciliate on the 

 keels. 



This si^ecies is distinguished from D. iinispicata with which it has been con- 

 founded, by its shorter and narrower leaves, the presence of 2-3 or more 

 spikelets in each culm, comparatively shorter and less acuminate outer 

 glumes, broader and more abruptly acuminate flowering glumes, the teeth 

 of which are much longer and more slender, and in the more abundant hairi- 

 ness of the flowering glumes. 



Specimens examined : California : Walkers Valley, Mendocino County, May 25, 

 1899, "very abundant," No. 5038 J. Burtt Davy; Kawah meadows, Tulare 

 County, altitude 9,300 feet. No. 5347 C. A. Purpus. In this specimen the 

 spikelets are only 10 mm. long; Silver Lake, Amador County, Hansen, 

 June 30, 1899. Oregon: Cougar Peak, August 8, 1896, No. 189 Coville and 

 Leiberg. Washington : Falcon Valley, in low grounds, July 3, 1885, No. 

 150 W. N. Suksdorf. In these specimens the outer glumes are IS mm. 

 long, a little longer than in the type and the callus hairs are a little longer 

 but the plants are otherwise the same. Near Montesano, Chehalis County, 

 June 8, 1898, No. 3908 A. A. and E. Gertrude Heller. There is also a speci- 

 men in the National Herbarium from Washington, collected by Suksdorf 

 in 1880. Canada : Crevices of rocks, Nanaimo, Vancouver Island. No. 39 

 J. Macoun, June 13, 1887. Chile: Province of Nuble, No. 256 Herb. Philippi. 



DANTHONIA THERMALE Scribn. sp. nov. 



A rather slender, erect, densely caespitose perennial with narrow, more or less 

 pilose leaves and densely few-flowered panicles 3-5 cm. long. Sheaths, at 

 least the lower ones, papillate pilose; ligule a dense fringe of short hairs, 

 those near the margin 3-3 mm. long. The lower leaves, especially those of 

 the innovations conspicuously pilose, the upper surface rather densely hairy. 

 Branches of the panicle 1-3-flowered, erect, pedicels scabro-pubescent. Outer 

 glumes nearly equal, 12-13 mm. long, 3 mm. wide, 5-7-nerved, apex acute; 



