BULL ACE: PLUM, ETC. 267 



gives off about half-a-dozen weak secondaries at somewhat 

 acute angles on each side ; these curve forwards and soon 

 loop and break up, and have secondary loops superposed 

 on them, beneath the margin. Network abundant, and 

 loops distinct. Each pair of secondaries in mid-leaf, about 

 I the length of the midrib apart. Angles of divergence 

 about equal, 40 or so. Ends of tertiaries, &c. termin- 

 ating in teeth. Tertiaries from the outside of the 

 secondaries at more acute angles than those from the 

 inner sides. 



[The following varieties, or sub-species, are noteworthy, 

 and it will be seen that they carry the species into the 

 non-spinescent forms : even P. spinosa itself is sometimes 

 devoid of the thorns, and it should be noted that the Pear 

 (see p. 274) may have its dwarf shoots hard and sharp, 

 like thorns: it is distinguished by its long eglandular 

 petioles, more rounded and very reticulate leaf, and ex- 

 tended narrow crescentic leaf-insertions. The young 

 leaves are also involute and the shoots glabrous. 



Prunus insititia, L. Bullace (Fig. 98). Small tree 

 with velvety-pubescent, and somewhat spinose, slender 

 shoots ; flowering before or with the leaves. Leaf broad- 

 ovate, ovate-lanceolate, elliptic or oblong-obovate, acute, 

 serrate, softly pubescent, especially on the venation be- 

 neath, becoming glabrous above, 4 6 x 2 3 cm. Stipules 

 linear, pubescent. Leaf convolute in bud. Petiole 5 

 10 mm. 



Prunus domestica, L. Plum (Fig. 99). Small tree with 

 slender, glabrous and non-spinescent shoots ; flowering 

 with the leaves. Leaf shorter and broader, elliptic or 

 oblong, obovatc, acute, crenulate-dentate or bi-serratc ; 

 pubescent beneath, especially on the veins, becoming 



