The tree-characters given by Marshall are hardly those of the plum under cultivation which we have been calling _Prunus angustifolia_, and his statement that the species is “impatient of much cold” at once separates the cultivated “Angustifolias” from the true species. We shall contrast the tree-characters of the two groups of plums in the discussion of _Prunus munsoniana_. Of the hardiness of the two it may be said that the cultivated varieties which we have placed in the last named species are for the most part hardy as far north as Burlington, Vermont, while the true _Prunus angustifolia_ cannot be grown to fruiting as far north as Geneva, New York. Its behavior, too, on the northern limit of its range, and the fact that it did not follow the aborigines northward as it seems to have followed them from place to place within its range, show that _Prunus angustifolia_ belongs in the southern states. This plum was well known by the early colonists of Virginia and southward. John Smith in Virginia, in 1607-9, and Strachey, writing a few years later, saw “cherries much like a damoizm, but for their taste and cullour we called them cherries.” Beverly in his _History of Virginia_, written in 1822, speaks of two sorts of plums, “the black and the Murrey Plum, both of which are small and have much the same relish with the Damasine”; the latter was probably the Angustifolia. Lawson in his _History of Carolina_ speaks of several plums,[135] one of which, the Indian plum, must have been the fruit of the present discussion. Bruce[136] quotes a letter from William Fitzhugh, written in 1686, in which the latter speaks of the “Indian Cherry,” meaning of course, this plum; for it still passes under the same name. Of the horticultural possibilities of _Prunus angustifolia_, little can be said from this Station as the trees cannot be grown here. But since the species has been so long known, and is so near at hand to fruit-growers, without more of its offspring coming under cultivation, it is not likely that it may be counted upon to bring forth much in the future for the orchard. Such trees and fruits of this species as the writer has seen are not at all promising for the cultivator. =PRUNUS ANGUSTIFOLIA WATSONI= (Sargent) Waugh[137] =1.= Waugh _Vt. Sta. An. Rpt._ =12=:239. 1899. =2.= Bailey _Cyc. Am. Hort._ 1450 fig. 1901. _P. watsoni._ =3.= Sargent _Gar. and For._ =7=:134, fig. 1894. =4.= Waugh _Bot. Gaz._ =26=:53. 1898. =5.= Bailey _Ev. Nat. Fr._ 218. 1898. Shrub four to ten feet high; branches slender, short-jointed, zigzag, reddish-brown; branchlets at first bright red and lustrous, later becoming brownish-red or sometimes ashy-gray; lenticels few and light-colored; leaves small, ovate, apex acute, base rounded or cuneate, margins finely crenulate; upper surface glabrous, shining, lower surface paler, glabrous; petioles reddish, one-half inch in length, biglandular at the apex.