POACEAE. 39 



3. Eragrostis pectinacea (Michx.) Steud. In sandy soil from Mass, and 

 S. D. to Fla., Tex. and Colo. Alt. 4000-5000 ft. Meadow Park. 



55. CATABROSA Beauv. WATER WHORL-GRASS. 



i. Catabrosa aquatica (L.) Beauv. In water, where it is often floating, 

 from Lab. to Alaska, Nebr., Colo, and Utah. Alt. 5000-9500 ft. Sangre de 

 Cristo Creek; Rabbit-Ear Pass; Fort Collins; Breckenridge ; near Gray's 

 Peak; gulch west of Pennock's. 



56. EATONIA Raf. 



Second empty glume much wider than the flowering glumes, rounded or truncate 



and somewhat cucullate at the apex. 

 Intermediate nerves of the second glume almost as prominent as the lateral 



ones ; leaf-blades firm, much broader than the sheaths and therefore with 



prominent auricles. i. E. robusta. 



Intermediate nerves of the second glume faint, the lateral strong; leaf-blades 



soft, not much wider than the sheaths ; auricles not prominent. 



2. E. obtusata. 

 Second empty glume not much wider if at all than the flowering glumes, obtuse 



or acute. 

 Second empty glumes rather firm, as well as the flowering glumes obtusish. 



3. E. intermedia. 



Second empty' glume thin and with a broad, scarious margin, acutish ; flower- 

 ing glumes acute. 4. E. Pennsylvania a. 



1. Eatonia robusta (Vasey) Rydb. (E. obtusata robusta Vasey.) On 

 river-banks from Neb. to Wash., N. M. and Ariz. Alt. 4000-5000 ft. Vicin- 

 ity of Boulder; Rocky Ford. 



2. Eatonia obtusata (Michx.) A. Gray. In meadows from Mass, to Mont., 

 Fla. and Ariz. Alt. 4000-6000 ft. About Boulder; Manitou; gulch west of 

 Soldier Canon; near Timnath; Fort Collins; Hotchkiss, Delta Co. 



3. Eatonia intermedia Rydb. In meadows from Alb. to Colo. Alt. 5000- 

 8000 ft. Pagosa Springs; Durango; Gunnison. 



4. Eatonia pennsylvanica (DC.) A. Gray. In open woods and among 

 bushes from N. B. to B. C, Ga. and Colo. Alt. 4000-7500 ft. Vicinity of 

 Pike's Peak; Arboles; Pagosa Springs; Alamosa. 



57. MELICA L. MELIC-GRASS. 



Stem not bulblike-thickened at the base. i. M. parviftora. 



Stem bulblike-thickened at the base. 



Second empty glume much shorter than the flowering glume of the lowest 

 flower ; spikelets flattened. 2. M. spectabilis. 



Second empty glume about equalling the flowering glume of the lowest flower; 

 spikelets terete or nearly so. 3. M. bulbosa. 



i. Melica Porteri Scribn. (M. parviUora (Porter) Scribn.) On hillsides 

 and in canons, especially among bushes, from Neb. to Colo., Tex. and Ariz. 

 Alt. 6000-9000 ft. Cheyenne Canon; mountains near Pagosa Peak; Engel- 

 mann Canon; vicinity of Ouray; Idaho Springs; Glen Eyrie; Upper La 

 Plata; vicinity of Pike's Peak; Black Canon; Manitou; vicinity of Pine 

 Grove. 



