236 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



Trifolium pauciflorum Nutt. ; Torr. & Gvay, Fl. N. Am. i : 319 

 [Man. R. M. 56; Bot. Cal! 130]. 

 In moist sandy soil in the western part of the state. 

 Montana: Missoula, 1898, WiH/ams <£: Gt'iffith. 



* Trifolium microcephalum Pursh, Fl. Am. Sept. 478 [Bot. Cal. i: 



131]- 



Belongs to the group represented by the preceding, but the invo- 

 lucre is membranous and less deeply lobed ; the head is small and 

 dense and the plant is slender and villous with soft hairs. 



Montana: Vallev of Clark's River, 1806, Lczvis. 



* Trifolium Montanense. 



A cespitose or subacaulescent glabrous perennial ; flowering 

 stems very short, 1-3-leaved ; stipules 5-10 mm. long, ovate or 

 broadh' oblong, obtuse, somewhat scarious, brownish-veined ; petioles 

 "1^-6 cm., or in depauperate specimens only 1-2 cm. long ; leaflets 0.5- 

 2 cm. long, obovate, finely but sharply dentate, with the veins run- 

 ning out into the teeth, at the apex rounded and mucronate ; pe- 

 duncle 5-10 cm. long, ascending, bearing an upright head, or in 

 depauperate specimens decumbent and s-shaped, only 2-4 cm. long; 

 head involucrate, 1.5-2 cm. in diameter, 8-20-flowered ; lobes of 

 the involucre obovate, often bluntl}-^ toothed, obtuse or merely acute, 

 scarious and brown- veined, surpassed by the lower sepals by about 

 one-third ; sepals very unequal, the lower three, and especially the 

 central one, much longer than the upper two and the tube of the 

 calyx, all broadly subulate ; corolla dark purplish, very glossy, in 

 age brown, veined, and somewhat marcescent; ovules 4. 



A very near relative of T. Parryi, and has been mistaken for 

 that species. It differs, however, in the smaller size, the broader 

 obovate leaflets, the shorter and blunter divisions of the involucre, 

 the longer lower sepals, and the smaller and darker flowers. In T. 

 Parryi the leaflets are oblong or oblanceolate, often acutish, the 

 heads 2.5 cm. in diameter, and the segments of the involucre ob- 

 long, generally surpassing the lower sepals w'hich are only slightly 

 longer than the upper ones. 



On high mountains, at an altitude of 2500-3200 m. 



Montana: Old Hollowtop, Pony Mountains, July 7 and 9, 1897, 

 Rydberg & Bessey, 4461 (type), 446J (depauperate form) and 

 4464; Mountains, near Indian Creek, July 22,4462; Electric Peak, 

 August 18, 4460 (depauperate) ; Park Co., August, 1887, P. 

 Tweedy; Mt. Blackmore, 1886, ioy4; Grizzly Creek, 1887, 114. 



Yellowstone Park : Mt. Holmes, 1884, Tweedy, 64. 



