to form a cup-shaped basal portion; pedicels slender, about 1 mm. long; calyx 

 5-8 mm. long, thin, glabrous, the teeth longer than the tube; corolla 8-14 mm. 

 long, white to pink or rose-color; fruit 2- to 4-seeded. 



In wet meadows, mud, boggy areas, edge of water along streams and about 

 ponds, and on slopes, in N. M. (widespread in mts.) and Ariz. (Apache to 

 Coconino, s. to Greenlee and Gila cos.), June-Sept.; also Colo, and Ut. 



6. Trifolium lacenim Greene. 



Stem much-elongated, reclining; leaflets narrowly linear to lanceolate or oblan- 

 ceolate, often conspicuously cuspidate and spinulose-serrate; stipules broad, 

 oblong-lanceolate to ovate, deeply and sharply toothed to laciniate; peduncles 

 normally glabrous; heads 1-2 cm. wide and more than 10-flowered, with a 

 manifest involucre; involucral bracts not foliaceous, relatively broad and deeply 

 cut. with setaceous teeth, united for about a third their length to form a cup- 

 shaped basal portion; corolla less than 12 mm. long. 



Low wet meadows and wet places in N. M. (Grant, McKinley, Socorro and 

 Taos cos.) and Ariz. (Coconino to Cochise and Pima cos.), Mar .-Aug. 



7. Trifolium nanum Torr. 



Cespitose perennial, 2-6 cm. tall, erect or spreading from woody branched 

 crowns of roots, acaulescent, glabrous; petioles slender, longer than the leaflets; 

 leaflets 6-15 mm. long, narrowly obovate to linear-oblanceolate or oblong, glab- 

 rous, slightly serrate to almost or quite entire; heads of 2 or 3 flowers, peduncled, 

 often borne somewhat above the leaves, essentially non-involucrate or with 2 or 

 3 small inconspicuous whitish cupulate involucres that are usually not over 1.5 

 mm. long; flowers ascending on slender pedicels 1-2 mm. long; calyx glabrous, 

 the campanulate tube 3-4 mm. long, with lanceolate to deltoid teeth about 2 

 mm. long; corolla 1.6-2 cm. long, reddish-purple or rose-purple, rarely whitish; 

 fruit 5- to 10-seeded. 



Wet meadows in high mts., in N. M. (Mora Co.), summer; Mont., s. to N. M. 

 and Ut. 



8. Trifolium Parryi Gray. 



Glabrous to brownish-pubescent tufted perennial from a thick taproot; stems 

 numerous, 1-5 cm. long, covered with stipules that are thin, scarious, marcescent, 

 entire to toothed and rounded to acutely pointed; leaflets 3, broadly elliptic to 

 obovate, entire to serrulate or denticulate, rounded to acute at apex, 1-4 cm. 

 long; petioles 1-6 cm. long; head involucrate, subglobose, 10-35 mm. thick, 

 4- to 30-flowered; peduncles usually exceeding the leaves; involucral bracts 6 to 

 12, distinct, thin and scarious, entire-margined, purplish-brown, rounded to acute 

 or bifid at apex, usually about equaling the calyces; flowers 11-22 mm. long, 

 spreading to erect, the pedicels 0.5-2 mm. long; calyx glabrous, scarious, about 

 one half the length of the corolla, the tube from one half as long to as long as 

 the subulate to triangular subequal teeth; corolla dark reddish-purple, aging 

 brown; legume 1- to 4-seeded. 



In wet alpine to subalpine meadows and on wet stream banks in N. M. (Mora 

 Co.), June-Sept.; Mont, and Ida., s. to mts. of N. M. and e. Ut. 



9. Trifolium dasyphyllum T. & G. 



Cespitose acaulescent perennial, 5-15 cm. tall or more, from a woody branched 

 caudex; petioles elongate; leaflets linear-lanceolate to lanceolate, 1-3 cm. long, 

 cuneate at base, acuminate at apex, sparsely to densely strigose especially below, 

 entire; heads borne on peduncles above the leaves, globose, 1.5-2.5 cm. wide, 

 with 10 to 30 flowers, without an involucre or this obsolescent; pedicels short and 

 pubescent, about 1 mm. long; flowers reflexed or not in age; calyx 6-10 mm. long 



1051 



