NATIVE AMERICAN SPECIES OF PRUNUS. 31 
Horticulturally, the species has received little attention, though 
the fruit is gathered from the wild trees and made into preserves. 
The fruit is variable in size and quality, and a careful search for desir- 
able forms might form the basis for the development of late-ripening 
varieties of value in some of the Southern States. It is apparently 
more susceptible to frost injury than Prunus reverchonw and, though © 
drought resistant to an appreciable extent, is probably less so than 
the latter species. It has been used as a stock in the nursery of T. V 
Munson at Denison, Tex., with very satisfactory results, and its vigor 
and nonsuckering character may lead to its further use. 
Prunus Mexicana HYBRIDS. 
Prunus mexicana has been hybridized with P. triflora, and wild 
trees in the vicinity of Henrietta, Tex., are apparently hybrids with 
P. reverchonu. One of these has been named horticulturally and for 
a time was offered by several nurseries, but it has little to commend it. 
Prunus Suscorpata Benth. 
(Pacific or western wild plum.) 
Prunus subcordata Benth., 1848, Pl. Hartw., p. 308. 
Prunus subcordata kelloggit Lemmon, 1890, in Pittonia, v. 2, p. 67. 
Leaves orbicular (Pl. II, fig. 2), oblong-orbicular, or sometimes 
ovate, rounded, subcordate, or rarely gradually narrowed at the base 
and usually rounded and obtuse at the apex, 2.5 to 5 cm. long, 1.5 
to 4 cm. broad, the margins incisely serrate, sometimes doubly so, 
the teeth at first gland tipped, the glands usually falling away in age, 
leaving the serrations more or less obtuse, or more rarely the serra- 
tions acute, the young leaves usually pubescent, at least below, 
becoming glabrous as they mature or sometimes remaining rather 
strongly pubescent below, even in age; petioles 7 to 12 mm. long, 
glabrous or pubescent, glandular near the apex or sometimes the 
glands on the base of the blade; stipules lanceolate with glandular 
margins. Flowers 15 to 18 mm. broad, in umbellike clusters of 2 to 
4, appearing with the leaves from the first of April to about the middle 
of May, according to the locality; pedicels and calyx pubescent or 
glabrous, the pedicels 7 to 13 mm. long; calyx tube campanulate, 
about 3 mm. long, the lobes usually slightly longer, oblong or oblong- 
obovate, obtuse, and glandular-serrate, usually glabrous within; 
petals entire, 7 to 9 mm. long, oblong or obovate and abruptly con- 
tracted to a short claw. Fruit ripening in August or September, 
slightly oblong, 1.5 to 3 cm. long, dark red, purplish red, or rarely 
yellow, variable in quality, though often excellent; stone oblong, 
oval (Pl. IX, figs. 8 to 15), or rarely somewhat orbicular, 12 to 18 mm. 
long, 10 to 17 mm. broad, oblique or somewhat pointed at the base 
and rounded with an obscure point at the apex, variously ridged 
