DRUPACEAE. 



[VOL. II. 



4. Prunus angustifolia Michx. Chicka- 

 saw Plum. Hog Plum. (Fig. 2010.) 



Primus angustifolia Marsh. Arb. Am. in. 1785. 

 Prunus Chicasa Michx. Fl. Bor. Am. i: 284. 1803. 



A small tree, sometimes 25 high, the trunk 7' 

 in diameter, the branches somewhat thorny. 

 Leaves lanceolate or oblong-lanceolate, acute at 

 the apex, serrulate, often rounded at the base, gla- 

 brous when mature, $'-$' long; flowers smaller 

 than those of the preceding species, in lateral 

 umbels, expanding before the leaves; drupe red, 

 globose, 6"-9 // in diameter, nearly destitute of 

 bloom, thin-skinned, its stone ovoid, hardly flat- 

 tened, both edges rounded, one of them slightly 

 grooved. 



In dry soil, southern New Jersey to Florida, west 

 to the Rocky Mountains. Supposed to be native in 

 the Southwest Wood soft, reddish-brown; weight 

 per cubic foot 43 Ibs. April. Fruit ripe May-July. 



5. Prunus Watsoni Sargent. .Watson's 

 Plum. Sand Plum. (Fig. 2011.) 



Prunus Waisoni Sargent, Card. & For. 7: 134. / 

 25. 1894. 



A shrub, 6-io high, somewhat spiny. 

 Leaves ovate to ovate-lanceolate, firm, acute or 

 acuminate at the apex, rounded or narrowed at 

 the base, finely crenulate-serrulate all around, 

 i / -2 / long, 6"-io" wide, shining above, the 

 petioles about >' long; flowers 5 // -6 // broad, 

 in numerous sessile lateral fascicles; pedicels 

 4 // -6" long, red, glabrous; petals oblong-ob- 

 ovate, short-clawed; fruit globose or some- 

 what elongated, about 9" in diameter, orange- 

 red, without a bloom, the flesh yellow; skin 

 thick; stone oval, pitted, mostly rounded on both 

 margins, abruptly flattened at the summit 



Sandy soil, Nebraska to Arkansas. April-May. 



6. Prunus Alleghaniensis Porter. 

 Porter's Plum. (Fig. 2012.) 



J'rnnus Alleghaniensis Porter, Bot Gaz. 2: 85- 



1877. 



A low, straggling shrub or small tree, with 

 maximum height of about 15 and trunk dia- 

 meter of 5', seldom thorny. Leaves ovate-ob- 

 long or obovate, acute or acuminate, finely and 

 sharply serrate, rounded at the base, pubescent 

 when young, glabrous or very nearly so when 

 old; flowers similar to those of P. Americana, 

 about 7 // broad; drupe globose-ovoid, about 5" 

 in greatest diameter, very dark purple with a 

 conspicuous bloom; pulp pleasantly acid; stone 

 slightly flattened, a shallow groove on one 

 margin, a slight expansion on the other. 



Barrens of Huntingdon Co.. across the.Alleghany 

 Mountains to Clearfield Co., Pa. April. Fruit ripe 

 in August. 



