or more, silky, strigose, the subulate lobes subequal and about twice as long as 

 tube; corolla 1-1.5 cm. long, purple to pink, usually bicolored, with wings and 

 keel darker; fruit 3- to 5-seeded. T. stenolobum Rydb. 



In alpine wet meadows in N. M. (Bernalillo, Sandoval, San Miguel and Santa 

 Fe COS.), summer; also Colo. 



10. Trifolium amabUe H.B.K. 



Plants caulescent, with large thick roots; stems prostrate, to about 2 dm. tall 

 or long, decumbent; leaflets cuneate-obovate, glabrous or glabrate; heads 1-1.6 cm. 

 in diameter and height, on villous peduncles; involucre vestigial, seldom more 

 than 1 mm. long; flowers strongly reflexed on villous petioles; calyx villous, the 

 lobes toothed; corolla equal to or a little longer than calyx; fruit 2-seeded. 



In wet sandy soil about springs and along brooks, rare in Ariz. (Cochise Co.), 

 Aug.-Oct.; also s. to C.A. 



11. Trifolium Rydbergii Greene. 



Stems usually erect and single, 2-4 dm. tall, glabrous below, somewhat strigose 

 above; leaflets linear-lanceolate to oval, 2-5 cm. long or those of the basal leaves 

 shorter and broader, usually acute, sharply denticulate, glabrous or somewhat pu- 

 bescent on lower surface; peduncles 4-10 cm. long; heads 2-4 cm. long, non- 

 involucrate; calyx pubescent, the tube about 2 mm. long, with subulate-setaceous 

 teeth 4-5 mm. long or more; corolla white to pinkish, about 1.5 cm. long. 



Wet meadows and edge of pools in N.M. (Rio Arriba Co.) and Ariz. (Coco- 

 nino Co.), July-Sept.; N. M. and Ariz., n. to Mont, and Ida. 



12. Trifolium neurophyllum Greene. 



Perennial; stems scattered from horizontal rootstocks, 1.3-2.5 dm. tall, erect 

 or decumbent, canescently villous, usually with a solitary peduncled head; leaf- 

 lets of lowest leaves obovate to oblong, 1-2 cm. long, these passing above to such 

 as are 4 cm. long, linear to narrowly lanceolate and spinescently acute, loosely 

 villous especially on the midvein, all very prominently transverse-venulose and 

 doubly spinulose-denticulate with the teeth incurved; head without an involucre, 

 at first flowering broader than high, eventually 2.5 cm. long and the flowers de- 

 flexed; calyx villous with long appressed hairs, with 5 equally slenderly subulate 

 lobes of at least twice the length of the turbinate tube; corolla deep-red-purple, 

 twice the length of the calyx. 



Wet soils and wet edge c rtools and streams, N. M. (Grant and Socorro cos.) 

 and Ariz. (Coconino, Apache and Greenlee cos.), July-Sept. 



13. Trifolium pratense L. Red clover. 



Sparsely soft-hairy, short-lived, taprooted perennial; stems several, 3-10 dm. 

 tall; stipules ovate-lanceolate, 1-3 cm. long, conspicuously greenish veined; leaf- 

 lets 3, lanceolate to oblong-obovate, 2-6 cm. long, very inconspicuously serrulate; 

 heads terminal, sessile or with peduncles shorter than the 2 subtending leaves, 

 50- to 200-flowered, globose-conic, 2.5-3.5 cm. broad and about as long, nonin- 

 volucrate but the stipules of the upper leaves often somewhat involucral; flowers 

 sessile, spreading to erect, deep-red, 13-20 mm. long; calyx one half to two thirds 

 as long as the corolla, short villous-hirsute, the teeth acicular, pubescent with 

 straight somewhat pustulose hairs, the 2 upper ones about equal to the tube, the 

 lower 3 nearly twice as long; legume 2-seeded. 



Wet meadows and marshes, occasional in Okla., N.M. and Ariz., May-Aug.; 

 introd. from Eur., widely cult, and sometimes found as an escape. 



14. Trifolium repens L. White clover. 



Glabrous or very sparsely pubescent perennial; stems creeping and stolonous 

 to erect, 1-6 dm. long; stipules 3-10 mm. long, connate most of their length, 



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