62 BULLETIN 179, U. S. DEPARTMENT OF AGRICULTURE. 
flower clusters, but this appears to be a variable character both in 
the species and subspecies. The earliest name is therefore used to 
designate the low western form which occurs from Fort McMurray, 
in about latitude 57°, Alberta, southward along the eastern slope of © 
the Rocky Mountains to central Colorado. 
The proposed species Cerasus trichopetala was based on a Howering 
specimen collected by R. S. Williams, at Columbia Falls, Mont., 
May 24, 1894. The specimen differs in no way from other material 
of the subspecies. Prunus corymbulosa was described from the 
Bridger Mountains and the Little Rocky Mountains, Mont. 
Prunus Emarornata (Dougl.) Walp. 
Cerasus emarginata Dougl., 1834, in Hook. Fl. Bor. Amer., v. 1, p.- 169. 
Prunus emarginata Walp., 1843, Repert. Bot., t. 2, p. 9. 
Cerasus glandulosa Kellogg, 1854, in Bul. Cal. Acad. Sci., v. 1, p. 59. 
Cerasus californica Greene, 1891, Fl. Franc., [pt.]1, p. 50. | 
Cerasus crenulata Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 56. 
Cerasus arida Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 57. 
Cerasus prunifolia Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 57. 
Cerasus rhamnoides Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 58. 
Cerasus kelloggiana Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 58. 
Cerasus padifolia Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 59. 
Cerasus obliqua Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 59. 
Cerasus parvifolia Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 59. 
Cerasus obtusata Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 60. 
Prunus prunifolia Shafer, 1908, in Britt. and Shaf., N. Amer. Trees, p. 500. 
Leaves oblong-oval, obovate, or sometimes lanceolate (Pl. VI, 
fig. 3), 3 to 5.5 cm. long, 1 to 2 cm. broad, narrowed or even cuneate 
toward the base and obtuse or sometimes acute at the apex, the margins 
serrate and the teeth tipped with minute, pointed, sometimes in- 
curved glands, the base furnished with two or more larger dark- 
colored glands, or sometimes eglandular, more or less pubescent as 
they unfold, the upper surface at maturity green and glabrous, the 
lower pale and glabrous or marked with a few scattered hairs; petioles 
5 to 9 mm. long, glabrous or pubescent with short hairs; stipules 
lanceolate and glandular serrate. Flowers 10 to 15 mm. broad, ap- 
pearing with the leaves from early in April to the middle of June, 
according to the locality and altitude, in corymbose clusters of 5 
to 10; the pedicels subtended by small foliaceous dentate or laciniate 
bracts 6 to 14 mm. long, glabrous or nearly so; calyx glabrous, cam- 
panulate, the tube about 3.5 mm. long, the oblong or ovate-oblong 
obtuse lobes slightly shorter; petals obovate, entire or erose, 4 to 5 
mm. long, glabrous or sparingly hairy on the outer surface toward 
the base. Fruit globose, 8 to 10 mm. in diameter, ripening from 
July to the end of September, bright red in color when first fully 
grown, changing to nearly black when ripe, flesh thin, bitter, and 
astringent; stone oval or slightly ovoid (Pl. XII, figs. 38 to 40), 
