ROSACES 



569 



the northern limits of its range, \'-% ' in diameter, on slender glabrous pedicels -'-!' long, in 

 2-4-flowered umbellike clusters; calyx-tube broad-obconic, glabrous, obscurely nerved, 

 the lobes ovate, acute or acuminate, minutely glandular-serrate, glabrous or rarely slightly 

 pubescent on the outer surface, pubescent on the inner surface below the middle; petals 

 about \' long, obovate to oblong-obovate, entire or sparingly erose, white, about f ' long, 

 abruptly contracted into a short claw. Fruit ripening in July and August, subglobose to 

 short-oblong, f ' long, bright red with a slight bloom, marked by pale dots and occasionally 

 by yellow blotches, rarely yellow, with a thin skin and light or dark yellow juicy aromatic 

 fibrous flesh often of good quality; stone oval, compressed, pointed at apex, truncate or 

 obliquely truncate at base, thick-margined and grooved on the ventral suture, grooved on 

 the dorsal suture, irregularly roughened on the surface, about |' long. 



A tree spreading into dense thickets, the oldest central stem sometimes 20 high and 5' or 

 6' in diameter, diminishing in height and size to the margin of the thicket, with erect, rarely 

 slightly spinescent branches, and slender glabrous red-brown lustrous branchlets marked 

 by numerous pale lenticels. Winter-buds obtuse, chestnut brown, glabrous, rarely more 

 than ' long. Bark thin, usually smooth and reddish or chestnut-brown on young stems, 

 becoming gray or grayish brown and separating into thin platelike scales on older trunks. 



Distribution. Usually in rich soil; southern Illinois (Alexander, Gallatin, Pope, Johnson 

 and Richland Counties); southwestern Kentucky; central Tennessee; northern Mississippi; 

 central Missouri to southeastern Kansas, and through Arkansas to eastern Oklahoma, 

 western Louisiana (Natchitoches and Lincoln Parishes), and northern Texas west to Clay 

 and Lampasas Counties); now occasionally naturalized from cultivated trees in eastern 

 Texas, and eastward to Georgia, eastern Kentucky, southern Ohio, and in northern Mis- 

 souri. Hardy in eastern Massachusetts and western New York. 



Cultivated in orchards, a tree sometimes 20-30 tall with a trunk 6'-8' in diameter, and 

 rather small wide-spreading branches forming a handsome round-topped head. Selected 

 forms of the wild plants are valued by pomologists who have produced several hybrids by 

 crossing Primus Munsaniana with other American and with ,Old World species. The 

 " Wild Goose Plum," one of the best known forms of Prunus Munsoniana, has flowered and 

 produced fruit for many years in the Arnold Arboretum. 



11. Prunus angustifolia Marsh. Chickasaw Plum . 



Leaves lanceolate to oblong-lanceolate, pointed at the ends, apiculate at apex, and 

 sharply serrate with minute glandular teeth, glabrous or at first sometimes furnished with 

 axillary tufts of long pale hairs, bright green and lustrous on the upper, paler and rather 



