40 BULLETIN 179, U. S. DEPARTMENT OF AGRICULTURE. 
pressed, glandular serrate, the glands remaining as callous points, 
glabrous and green above, pale green and pubescent with scattered 
hairs below or rather densely pubescent when young, the pubes- 
cence rarely or not at all tufted in the axils of the lateral veins; 
petioles 10 to 12 mm. long, glandless or with one or two glands near 
the apex, pubescent along the upper edge; stipules linear or lobed, 
glandular. Flowers appearing in February or March, with or be- 
fore the leaves, in umbels of 2 to 4 or rarely 5, about 9 or 10 mm. 
broad; pedicels 6 to 8 mm. long, slender, glabrous; calyx campanu- 
late, the tube glabrous, about 2 mm. long, the lobes as long as the tube 
and ovate or oblong-ovate, usually pointed at the apex, glandular, 
obscurely pubescent on the outside, pubescent on the inner surface 
toward the base, and reflexed in age; petals 4 to 4.5 mm. or rarely 
5 mm. long, 2.5 mm. broad, obovate-orbicular, or rarely oblong-obo- 
vate, narrowed to a very short claw. Fruit ripening in June, sub- 
globose, about 15 mm. in diameter, red with a light bloom; stone 
oval to nearly globose (Pl. X, figs. 23 and 24), 9 to 12 mm. long, 7 to 9 
mm. broad, 6 to 7 mm. thick, rounded or shghtly pomted at the apex 
and rounded or obliquely truncate at the base, irregularly grooved 
along the vertical edge, the dorsal edge inconspicuously grooved or 
sometimes smooth, surface obscurely rugose. 
The species is a shrub 3 to 8 feet high with slender stems, forming 
open thickets. The bark of the stems is gray, that of the young 
twigs grayish or rarely somewhat reddish or pale chestnut in color, 
obscurely marked with oval lenticels; winter buds small. 
Prunus rivularis occurs (fig. 2) in bottom lands along streams in 
Texas from the Rio Blanco, in Hays County, to San Antonio. It is 
apparently not very abundant. 
The species was originally described from a specimen collected by 
Lindheimer, but neither the date nor locality are cited by Scheele. 
Among the seven specimens in the herbarium of the Missouri Botan- 
ical Garden collected by Lindheimer, one (No. 274, 1846) has a label with 
the same data that are given by Scheele and is apparently a duplicate 
of the type. On the same sheet is a package of stones labeled ‘‘ New 
Braunfels, Texas, 1846, Lindheimer,”’ and there can be little doubt 
that this is the type locality. Prunus terana was described from ma- 
terial collected by Roemer at New Braunfels, and a flowering speci- 
men of his in the herbarium of the Missouri Botanical Garden, ‘‘ Pru- 
nus terana Scheele,’ bears the legend ‘‘Scheele misit’”’ and is evi- 
dently part of the type material. It does not differ from P. rivularis. 
The Indians, according to Lindheimer, gathered these plums and 
cooked them with honey, but the fruit is small, poor in quality, and 
the species apparently has little value in horticulture. 
