ROSACES. SILVA OF NORTH AMERICA. 21 
PRUNUS UMBELLATA, var. INJUCUNDA. 
Sloe. 
CALYX-LOBES entire, pubescent on the outer, tomentose on the inner surface. Fruit 
subglobose to short-oblong. Leaves oblong to obovate-lanceolate, tomentose below. 
Prunus umbellata, var. injucunda. Prunus injucunda, Small, Bull. Torrey Bot. Club, xxv. 149 
(1898). 
A tree, sometimes twenty feet in height, with a trunk occasionally six or eight inches in diameter 
covered with nearly black furrowed bark, and stout erect or ascending branches forming an open 
uregular head; or often shrubby and spreading into broad thickets. The slender and frequently 
spinescent branches are coated with hoary tomentum when they first appear, and become reddish brown 
and pubescent during their first season, dark purple and puberulous in their second year, and ultimately 
dull gray-brown. The leaves are oblong or rarely obovate-lanceolate, acute or acuminate at the apex, 
gradually narrowed and cuneate at the base, finely serrate, with minute glandular teeth, and often 
furnished at the base with two large conspicuous dark glands; when they unfold they are coated 
below with hoary tomentum and are villose above, and at maturity they are membranaceous, dark yellow- 
green, tomentose or pubescent on the lower surface, particularly along the stout yellow midribs and 
slender primary veins, roughened above by short pale hairs, and usually about two inches long and an 
inch wide ; they are borne on stout tomentose petioles a quarter of an inch in length. The stipules are 
linear, glandular-serrate, from one eighth to one quarter of an inch long, and caducous. The flowers 
appear from the tenth to the middle of April, just before the leaves, in subsessile usually five-flowered 
umbels on slender pubescent pedicels from one half to five eighths of an inch in length. The calyx- 
tube is narrowly obconic and villose, with acuminate entire lobes villose on the outer surface and 
tomentose on the inner surface. The petals are nearly orbicular and abruptly contracted into short 
The 
fruit ripens in July and is short-oblong or subglobose, dark purple, slightly pruinose, and about half 
claws. The filaments are glabrous, and the pistil is villose toward the base, with short pale hairs. 
an inch in diameter, with thin austere flesh. The stone is ovoid, pointed at the ends, somewhat 
compressed, only slightly rugose, acutely ridged on the ventral suture, with a broad grooved ridge, 
conspicuously grooved on the dorsal suture, and about one third of an inch long, with thin brittle walls. 
Prunus umbellata, var. injucunda, is common about the base of Stone Mountain and of Little 
Stone Mountain in the granitic district of De Kalb County, central Georgia,’ where it was first noticed 
in July, 1893, by Mr. John K. Small’ 
From Prunus wmbellata of the south Atlantic and Gulf states this Plum-tree differs only in its 
1 Leaves of a low shrubby Plum gathered by Dr. Charles Mohr 
on sandstone cliffs at the summit of the Alpine Mountains, Talla- 
dega County, Alabama, in September, 1892, have been referred by 
Small to his Prunus injucunda. (See Mohr, Bull. Torrey Bot. Club, 
xxvi. 118; Contrib. U. S. Nat. Herb. vi. 552 [Plant Life of Alabama].) 
2 John Kunkel Small (January 31, 1869) was born at Harris- 
burg, Pennsylvania, of German ancestry, and was educated in pri- 
vate schools in his native city, at Franklin and Marshall College 
and Columbia University. A natural love of plants, fostered by 
that of his father and mother and stimulated by visits at his home 
from Professor Thomas C. Porter, who married his mother’s sister, 
early directed the thoughts of the boy to botany. From 1892 to 
1894 he held a botanical fellowship in Columbia, and in 1895 he 
received the degree of Ph. D. from that university, and was ap- 
pointed curator of its herbarium. He is now curator of the museum 
and herbarium of the New York Botanical Garden. Since 1888 
Mr. Small has been active in exploring the flora of the eastern 
and southern states, and has published numerous botanical papers, 
principally in the Bulletin of the Torrey Botanical Club, in which 
many previously undescribed species have been distinguished. 
Species in Xyris, Smilax, Listera, Pentstemon, and Senecio com- 
memorate his zeal in this field. 
