136 SYSTKMATir PoMOlJXiY 



D. Lonf serrations plandloss, acute; jtrtiole 

 usually jjlandless; stone turpid, large, jiointed 

 at the aj)ex ^'. /'. omrricana. 



DD. Leaf -serrations, glandular, wavy-crenate ; 

 petioles glandular; stone turgid, small, pro- 

 longed at the ends 7. P. hortnlana. 



CC. Flowers fading to pink: leaf -serrations coarse, 

 rounded, glandular only when young; petioles bi- 

 glandular; stone flat, large 8. P. nigra. 



BB. Leaves narrow, lanceolate-ovate, folded upward. 

 C. Fruits small, V2 inch in diameter, cherry like; 

 petiole bi-glandular; stone small, ovoid, turgid, 

 cherry-like; rarely a tree, tender 9. P. an guati folia. 



CC. Fruits large, 1 inch in diameter, plum-like; 

 petioles with from 1 to 6 glands; stone com- 

 pressed and pointed at both ends; usually trees; 

 hardy 10. P. Munsoniana. 



Domestica plums. 



The Domestica, or European plum, is the common plum of 

 fruit-growers in Europe and North America. Its many varieties 

 are the best known, have been cultivated longest and are most 

 widely distributed, and in number, quality of product, and in 

 most of the characters which make a tree a desirable orchard 

 plant, Domestica plums far surpass those of any others of the 

 ten cultivated species. 



194. Prunus domestica described. — Some authors make from 

 P. domestica two or three species and others divide it into several 

 botanical varieties, but to pomologists there seem to be no suffi- 

 ciently definite lines of cleavage between the many cultivated 

 varieties to make it desirable to divide the species. 



1. Prunus domestica, Linn. (Plate VI) Tree vigorous, open-headed, 

 round-topped; trunk attaining 1 foot or more in diameter; bark thick, 

 nearly smooth or roughened with transverse lines. Leaves large, obovate, 

 elliptical, thick and firm ; upper surface dull green, rugose, glabrous or 

 nearly so, the lower one paler with little or much tomentum, reticulated; 

 margins coarsely and irregularly crenate or serrate, often doubly so; teeth 

 usually glandular; petioles % inch in length, stout, pubescent, tinged with 

 red; glands usually 2, often lacking, sometimes several, globose, greenish- 

 yellow. Flowers appearing with or after the leaves, 1 inch or more across, 

 white; borne on lateral spurs or sometimes from lateral buds on one-year- 

 old wood, 1 or 2 from a bud in a more or less fascicled umbel; pedicels ^ 

 inch or more in length, stout, green. Fruit globular or sulcate, often 



