249 



jW. trifida, which also has 3-cleft petals, it can scarcely be con- 

 fused, as that species has reniform leaves, larger flowers, and the 

 segments of the petals are filiform. 



Type: J. H. Flodman, no. 527, Spanish Basin in the Madi- 

 son Range, Montana, July, 11, 1896, altitude 6000 ft. 



PoTENTiLLA CANDIDA Rydbcrg, Bull. Torr. Club, 24: 6. 1896. 



A few specimens of this species were collected by me in 1895, 

 at Deer Lodge, no. 2688, and at Lima, no. 2687. 



POTENTILLA CONVALLARIA n. Sp. 



Stem tall, erect, 4-10 dm. high, long- villous but not very dyensel 

 SO, glandular or viscid, especially above, branched above with 

 long erect branches. Stipules ovate or lanceolate, more or less 

 toothed, about i cm. long ; basal leaves several, with villous 

 petioles 5-10 cm. long, pinnate of 4-5 pairs, glabrate or slightly 

 pubescent; leaflets 2-5 cm. long, broadly obovate and obtuse, 

 coarsely serrate and incised with ovate teeth ; stem leaves with 

 fewer more acutish leaflets ; cyme with rather elongated upright 

 branches, but with short pedicels, and therefore rather elongated 

 and narrow; flowers 10-18 mm. in diameter; calyx densely 

 glandular- viscid, villous, not much enlarged in fruit, 8-10 mm. in 

 diameter; petals broadly obovate, white, in drying turning yellow, 

 a little longer than the sepals; bractlets lanceolate, much smaller 

 than the ovate-lanceolate sepals; stamens about 25, anthers flat, 

 slightly cordate at the base. (Plate 306.) 



This species resembles P. arguta, but is more slender. The 

 branches of the cyme are rather elongated, the calyx smaller, the 

 stamens fewer and the leaflets rounder and nearly glabious. 

 The leaves most resemble those of P. gliitinosa, from which the 

 plant differs mostly in its smaller and white petals and in the nar- 

 row cyme. It has been labelled Potentilla arguta whenever col- 

 lected. It is apparently a rather rare plant, representing that 

 species in the valle) s of the northern Rockies. The following 

 specimens have been examined: 



Montana: R>dbergandJ. H. Flodman, no. 602, in the Elk 

 Mountains ; no. 603 in the Spanish Basin ; no. 604 (type) near 

 Bozeman ; no. 605 in the Bridger Mountains, all in 1896. F. L. 

 Scribner, no. 42, 1883. 



Washington: Wilkes Exp. no. 817; C. V. Piper, no. 1528. 

 Assiniboia: J. Macoun, no. 41, 1880. (?) 



