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 t 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 pedicek, and therefore rather elongated and narrow ; flowers 10-18 mm. in diameter ; calyx densely glandular-viscid, villous, not much enlarged in fruit, S—to 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 glabrous. The leaves most resemble those of P. gluturosa, 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: Rydberg and J. H. Flodman, no. 602, in the Elk Mountains ; no. 6o3 in the Spanish Basin ; no. 604 (type) near Bozeman ; no. 6o5 in the Bridger Mountains, all in 1896. F. L.
Scribner, no. 42,1883.
Washington: Wilkes Exp. no. 81y; C. V. Piper, no. 1528.
Assiniboia: J. Macoun, no. 41,1880. (?) Idaho: A. A. & Gertrude Heller, no. 3230, 1896.
Wyonzuzg : T. II. Burglehaus, 1894; E. Stevenson, no. 72, 1894.
Macoun, no. 623, 1885 (Kananaskis).