FABACEAE. 201 



Bracts slightly, if at all, exceeding the calyx-tube, distinctly scarious- 

 margined and abruptly contracted into a long acumination ; plant 

 grayish. 13. T. dasyphyllum. 



Heads more or less involucrate by more or less united bracts. 



Plants low, cespitose ; stem scapiform ; bracts united only at the base. 

 Bracts lanceolate to linear-subulate; leaflets entire (see No. 9-13). 

 Bracts oblong, oval, ovate or obovate ; leaflets dentate. 



Banner long-acute, much exceedings the wings. 14. T. salictorum. 



Banner blunt, slightly exceeding the wings. 15. T. Parryi. 



Plants with elongated leafy stem ; bracts united to a monophyllous involucre. 

 Corolla 12-15 mm. long. 16. T. Fendleri. 



Corolla about 10 mm. long. 17. T. oxydon. 



1. Trifolium pratensis L. Cultivated and escaped along roads, around 

 dwellings and in waste places from Newf. and B. C. to Colo, and Calif. 

 Ft. Collins. 



2. Trifolium Rusbyi Greene. In meadows from Colo, to Ariz, and Calif. 

 Mancos. 



3. Trifolium Rydbergii Greene. (T. longipes A. Gray and Coult, in part; 

 not Nutt.) In meadows from Mont, and Ida. to Colo, and Utah. Alt. 

 6000-10,000 ft. Chicken Creek, West La Plata Mountains; mountain near 

 Veta Pass; Pearl; Elk River, Routt Co.; West Indian Creek; Gore Pass; 

 Dolores; Holdredge's ranch, North Park; Camp Creek. 



4. Trifolium repens L. Cultivated and escaped in waste places and mead- 

 ows from Newf. to B. C. to Fla. and Calif. Alt. up to 7000 ft. Cucharas 

 Valley, near La Veta. 



5. Trifolium nanum Torr. In the mountains from Mont, to Colo. Alt. 

 9000-14,000 ft. Mt. Evans; Lake City; Pike's Peak; near Empire; Carson; 

 Gray's Peak; mountains above Como; West Spanish Peak; Hayden Peak; 

 near Pagosa Peak; Cameron Pass; Berthoud Pass. 



6. Trifolium Brandegei S. Wats. In the mountains of Colo. Alt. up to 

 12,500 ft. Near Pagosa Peak; Cumberland Basin, La Plata Mountains. 



7. Trifolium subcaulescens A. Gray. (T. nemorale Greene) In dry soil 

 in Colo, and N. M. Los Pinos; Glenwood Springs; Mancos. 



8. Trifolium gymnocarpon Nutt. In arid places from Wyo. to Colo, and 

 Utah. Alt. up to 8000 ft. North Park; Cerro Summit. 



9. Trifolium stenolobum Rydb. On alpine peaks of Colo. Alt. 9000- 

 12,000 ft. Little Kate Basin, La Plata Mountains; Upper La Plata Canon; 

 near Ironton, San Juan Co. 



10. Trifolium attenuatum Greene. On alpine peaks of Colo. Alt. about 

 11,500 ft Near Pagosa Peak. 



11. Trifolium bacteolatum Rydb. (T. lilacinum Rydb.; not Greene; S. 

 petraeum Greene) On mountain peaks of, southern Colo. Alt. 9000-10,000 

 ft. West Spanish Peak. 



12. Trifolium lividum Rydb. On alpine peaks of Wyo. and Colo. Alt. 

 10,000-12,000 ft. Massif de 1'Arapahoe; Graymont; Alpine Tunnel. 



13. Trifolium dasyphyllum Torr. On alpine peaks from Mont, to Colo. 

 Alt. 7000-13,000 ft Berthoud Pass; Eldora to Baltimore; Lake City; 

 Pike's Peak; Hinsdale Co.; headwaters of Clear Creek; Cameron Pass; 

 Bald Mountain; Mt. Harvard; Silver Plume; mountains above Boreas; 

 Twin Lakes; mountains of Larimer Co.; Flat Top Mountains, Routt Co.; 



