FLOWERING PLANTS AND FERNS OF ARIZONA 445 



13. Trifolium pratense L., Sp. PL 768. 1753. 



Occasionally growing wild in Arizona, as at Lakeside (Navajo 

 County), and McNary (Apache County), introduced from Europe. 

 Red clover. Extensively cultivated in the eastern United States. 



14. Trifolium repens L., Sp. PL 767. 1753. 



At roadsides, etc., near Lakeside (Navajo County), Prescott (Yavapai 

 County), Chiricahua Mountains (Cochise County), introduced from 

 Europe. 



White clover. Often used in lawn mixtures. 



*15. Trifolium macilentum Greene, Pittonia 3: 223. 1897. 



Not known definitely from Arizona, but the type was collected in 

 southern Utah, probably not far from the Arizona State line. T. 

 macilentum is given as a synonym of T. howeUii Wats, by McDermott 

 (111. Key N. Amer. Trifolium 265. 1910). 



16. Trifolium hybridum L., Sp. PL 766. 1753. 



North rim of the Grand Canyon, Coconino County (Cottom in 1940). 

 Here and there in the United States; naturalized from Europe. 

 Alsike clover, 



17. Trifolium rusbyi Greene, Pittonia 1: 5. 1887. 



Trifolium longipes Xutt. var. pygmaeum Gray in Ives, Colo. 

 River Rpt. 9. 1860. 



White Mountains (Apache County), Kaibab Plateau, San Fran- 

 cisco Peaks, and Bill Williams Mountain (Coconino County), 7,000 

 to 8.500 feet, coniferous forests, June to September, types of T. 

 rusbyi from on or near the San Francisco Peaks (Lemmon, Rusby), 

 type of T. longipes var. pygmaeum from Bill Williams Mountain 

 {Newberry in 1858). Colorado to Arizona, probably also Oregon 

 and northern California. 



18. Trifolium neurophyllum Greene, Leaflets 1: 154. 1905. 



White Mountains, Apache and Greenlee Counties (Goodding 1076, 

 Kearney and Peebles 12423), 8,000 to 8,600 feet, August* New 

 Mexico and eastern Arizona. 



Easily distinguished from most of the Arizona clovers by the 

 very large heads of flowers. 



*19. Trifolium villiferum House, Bot. Gaz. 41: 335. 1906. 



Xot known definitely to occur in Arizona, but the type was col- 

 lected in southern L^tah, probably not far from the Arizona State line. 



21. LOTUS. Deervetch 



Plants annual or perennial, herbaceous or sufTrutescent; stems 

 leafy; leaves pinnately compound, but sometimes appearing digitate 

 by shortening of the rachis, the leaflets 3 or more (rarely only 1), 

 entire; flowers axillary, solitary or in few-flowered umbellike clusters, 

 sessile or pedunculate; corolla yellow to reddish orange (in one species 

 whitish, fading pink) ; filaments all or some of them flattened, at least 

 near the apex; pods narrow, subterete or somewhat flattened, several- 

 seeded. 



These plants are also known as deerclover. Most of the species 

 are grazed or browsed by domestic animals and deer, and the forage is 



