NATIVE AMERICAN SPECIES OF PRUNUS. 61 
ward to southwestern North Carolina and is said to reach its greatest 
size in this region. 
The fruit of this species is not edible, but the tree is sometimes 
used as a stock on which to bud the sour cherry (Prunus cerasus) and 
in northern regions is the only stock on which that fruit has as yet 
been successfully grown. A.S. Fuller (25, p. 184) notes as early as 
1867 that the wood of this species and that of the cherry unite very 
readily. 
Prunus PENNSYLVANICA CORYMBULOSA (Rydb.) W. F. Wight. 
Prunus corymbulosa Rydb., 1900, Cat. Fl. Mont., p. 226. 
Cerasus trichopetala Greene, 1905, in Proc. Biol. Soc. Wash., v. 18, p. 60. 
Prunus trichopetala Blankinship, 1905, in Mont. Agr. Coll. Sci. Studies, Bot., v.1, 
No. 2, p. 70. 
Prunus pennsylvanica saximontana Rehder, 1908, in Mitt. Deut. Dendrol. Gesell., 
No. 17, p. 160. 
LEGEND: 
The subspecies are (ncluded with the specle 
PIPUNUS PENNSYLVANICA 
77 EMAPG/INATA —_— 
” PUMILA <> © es oe 
77 CUNEATA es oo eee 
” BESSEYV! ons see 
Fic. 4.—Outline map of the United States, showing the distribution of native American speeley: of 
Prunus: Pennsylvanica, emarginata, pumila, cuneata, and besseyi. 
Leaves ovate to ovate-lanceolate or sometimes oblong-oval (Pl. VI, 
fig. 2), narrowed toward the base, acute at the apex. Flowers 12 to 
18 mm. broad, in sessile or sometimes pedunculate clusters of three 
to six. Stone slightly ovoid, about 6 mm. long. 
The subspecies forms a small shrub, 3 to 6 feet high, differing from 
the species in its shrubby character and in the mature leaves being 
broader in proportion to their length, and in the stone being slightly 
ovoid instead of round-oval. 
_ Prunus pennsylvanica saximontana was described from Colorado, 
Wyoming, and the Black Hills region of South Dakota and was dis- 
tinguished from the type of P. pennsylvanica corymbulosa by its sessile 
