572 AMYGDALACEAE 



usually 1.5-2 cm. long or longer at maturity : sejjals pubescent within : drupes globose or 

 nearly so, 12-15 mm. in diameter, nearly Ijlack beneath the bloom ^yhen mature, with an 

 acid flesh : stone plum]), acute at both ends. 



About river swamps and hammocks, South Carolina to Florida, Louisiana and Arkansas. Hog 

 Plum. Black Sloe. Bcllace Plum. 



8. Prunus mitis Beadle. A shrub or small tree, 4-8 m. tall, seldom spiny, with dark 

 gray or reddish brown bark and glabrous shining twigs. Leaf-blades 2-9 cm. long, ellip- 

 tic, oblong-lanceolate or rarely ovate or obovate, acute or acuminate, sharply serrate, nar- 

 rowed or rounded at the base, finely pubescent on both surfaces and especially along the 

 prominent midrib and veins beneatli, biglandular at the base, or on tlie short pubescent 

 petioles : hypanthium glabrous, at least the lower portion : sepals triangular, subacute, 

 pubescent outside, densely so on the inner surface : drupe oblong, 10-14 mm. long, dark 

 purple with a glaucous bloom : stone ovoid or oval, slightly compressed, about 1 era. long, 

 pointed at both ends and especially at the apex, crested on one margin. 



In dry soil, Georgia and Alabama. 



9. Prunus tarda Sarg. A tree often becoming 8 m. tall and 6 dm. in diameter at the 



base, with wide-spreading branches, the slender branchlets lustrous. Leaf-blades firm, 



oblong to obovate, 3.5-7.5 cm. long, acute or acuminate at the apex, finely serrate with 



minutely glandular teeth, becoming glabrous above, more or less pubescent beneath along 



the yellow midrib and its branches, gradually narrowed and rounded or cuneate at the 



base ; petioles densely pubescent : flowers 2 or 3 together : pedicels glabrous, 2 cm. long 



or shorter: sepals acute, entire, pubescent on both surfaces: corolla 10-14 mm. broad : 



drupe broadly oblong to subglobose, 8-12 mm. long, yellow, purple, red, blue or black, 



somewhat acid : stone slightly flattened, acute and apiculate at the apex, rounded at the 



base. 



In open woods and thickets, Arkansas to Louisiana and Texas. 



10. Prunus nonnalis (T. & G. ) Small. A shrub 3-13 dm. tall, with spreading un- 

 armed branches and densely pubescent young foliage. Leaf-blades thick, oblong to elliptic, 

 2-3 cm. long, obtuse or merely acute at each end, sharply serrate with appressed teeth, 

 sparingly pubescent above, densely tomentose and prominently nerved beneath, short- 

 petioled : flowers in lateral clusters preceding the leaves : pedicels slender, 9-15 cm. long : 

 sepals ovate or ovate-lanceolate, finely pubescent, obtuse : corolla 6-8 mm. broad : drupes 

 globose-oval, 8-10 mm. long : stone suborbicular, slightly flattened. 



In dry or sandy soil, Kansas to Tennessee and Texas. Sow Plum. 



11. Prunus Injuciinda Small. A shrub or tree of a somewhat straggling habit, 5-8 m. 

 high, with a maximum trunk diameter of 2 dm., seldom spiny, clothed with a dull dark- 

 gray bark which on the younger branches is covered with fine pubescence of a velvety tex- 

 ture. Leaf-blades 2-6 cm. long, 1-3 cm. broad, oval or obovate, acute or somewhat acu- 

 minate, finely but sharply serrate with apiculate teeth, acute or acuminate at the base, 

 conspicuously and densely pubescent beneath, inconspicuously pubescent and slightly rugose 

 above, the midrib very prominent, its lateral branches less so; petioles 0.5-1 cm. long, 

 pubescent : drupe oblong, 12-15 mm. long, dark purple, clothed with a lighter bloom : stone 

 ovoid, 8-10 mm. long, much compressed, pointed at both ends, crested, and grooved on each 

 side of the crest, also grooved on the opposite side. 



In sandy soil in the granite districts, Georgia and Alabama. Hog Plum. 



12. Prunus rivularis Scheele. A shrub 1-2 m. tall, with shining, glabrous, some- 

 what angled branchlets. Leaf-blades oblong or oblong-ovate, long-acuminate, serrate, 

 glabrous above, sparingly pubescent beneath, short-petioled : clusters with usually 2 or 5 

 flowers, or flowers sometimes solitary : pedicels 9-13 mm. long : sepals lanceolate, sparingly 

 pubescent : corolla mostly 12-13 mm. broad : drupes subglobose, 15-20 mm. long, bright- 

 red, shining. 



In river valleys, Texas. 



13. Prunus Watsonii Sarg. A sparingly spiny shrub 2-3.5 m. tall, with glabrous 

 foliage. Leaf-blades thickish, oblong or oblong-lanceolate, 2-5 cm. long, acute at the apex, 

 crenulate-serrate, acute or rounded at the base, lustrous above, pale and dull beneath ; peti- 

 oles slender, wiry, 1-1.5 cm. long : clusters few-flowered : pedicels 8-12 mm. long, red : sepals 

 ciliate, but without glands: corolla 10-12 mm. broad, pure white : drupes subglobose or 

 somewhat elongated, 20-22 mm. long, orange-red, without bloom, the flesh yellow : stone 

 oval, slightly pitted, abruptly flattened near the apex. 



In sandy soil, Nebraska to Arkansas. Sand Plum. 



14. Prunu8 angustif olia Marsh. A sparingly spiny shrub or small tree, sometimes 

 8 m. tall, with a slender trunk, often forming thickets. Leaf-blades rather thin, oblong to 

 oblong-lanceolate, 3-10 cm. long, acute or slightly acuminate at the apex, serrulate, acute or 

 rounded at the base, short-petioled : flowers in lateral clusters, appearing before the leaves : 



