NATIVE AMEEICAN SPECIES OF PEUNUS. 65 



Prunus Pumila L. 



(Sand clierry.) 



Prunus pumilaJj., 1767, Mant. PI., p. 75. 



Cerastes canaden^s Mill., 1768, Gard. Diet., ed. 8. (Not Prunus canadensis L.) 

 Cerasus glauca Moencli., 1794, Meth. PI.,- p. 672. 

 ■Prunus susquehanae Willd., 1809, Enum. Hort. Berol., [t. 1], p. 519. 

 Prunus depressa Pursh, 1814, Fl. Anier. Sept., v. 1, p. 332. 

 Prunus incana Schweinitz, 1824, in Long Narr. Exped., v. 2, p. 387. 



Leaves narrowly oblanceolate (PI. VII, fig. 3), 3 to 7 cm. long, 1 to 

 2 cm. broad, cuneate toward the base, acute at the apex, usually 

 serrate, with appressed teeth, at least above the middle, the serrations 

 sometimes inconspicuous, glabrous on both surfaces and pale, or even 

 with a glaucous appearance below; petioles 7 to 10 mm. long, eglan- 

 dular or with one or two glands near the apex, or sometimes with 

 glands on the base of the blade ; stipules linear and glandular serrate. 

 Flowers appearing mth or before the leaves from the first of May to 

 the middle of June, about 12 mm. broad, usually in clusters of 3; 

 pedicels 9 to 10 nun. long, slender and glabrous; calyx glabrous, the 

 tube campanulate, about 2.5 or 3 mm. long, the oblong, obtuse lobes 

 as long as the tube or nearly so, minutely glandular on the margin; 

 petals oblong-oval, narrowed to a short claw, about 6 mm. long. 

 Fruit nearly black, without bloom, globose, and about 10 to 15 mm. m 

 diameter, ripening in the latter part of July and in August, covering 

 a period of four weeks or more, even in the same locality, usually not 

 of good quality but occasionally palatable ; stone ovoid (P1.#^II, figs. 

 31 to 34), usually rounded at the base, somewhat pointed or obtuse 

 at the apex, varying from about 9 mm. long, 5.5 mm. broad, and 5 

 mm. thick to 11 mm. long, 7.5 mm. broad, and 7 mm. thick, slightly 

 grooved on either side of the ventral edge, but without a prominent 

 ridge or v,dng, rounded and minutely grooved on the dorsal edge, 

 usually with a few rather obscure, oblique grooves branching from the 

 dorsal groove. 



Prunus pumila is a shrub 1^ to 5 feet high, of wiUowlike habit, 

 erect when young, the main stems later becoming more or less pros- 

 trate, but the growing branches erect; bark dark gray and marked 

 with lighter-colored Icnticels, the young twigs reddish, becoming dark 

 rcddLsh brown and finally gray. 



Prunus pumila was originally described from Canada, and occurs 

 (fig. 4) in gravelly or sandy or sometimes rocky localities along the 

 shores of lakes or streams from eastern Quebec to Maryland, and 

 westward to northern Indiana, eastern Minnesota, and the Lake of 

 the Woods, It is especially abundant in the sand dunes along the 

 shores of the Great T>akes, where it attains a much larger size than on 

 the sandy plains of northern Michigan. 



74240'— Dull. 17»— 15 5 



