ROSACES. (ROSE FAMILY.) 141 



2. P. angusfcifolia, Ait. Leaves lanceolate or oblong, acute at the base, 

 serrate, short-petioled ; corymbs simple, few-flowered ; flowers rose-color, very 

 fragrant ; styles smooth, distinct. Open woods, chiefly iu the upper districts. 

 April. A small tree. Fruit very sour. 



* * Leaves simple, the midrib glandular above : fruit baccate, globose, 



3. P. arbutifolia, L. Leaves oval-oblong or somewhat obovate, abruptly 

 acute or mucrouate, smooth above, except the midrib, finelv serrate; stvles 

 villous at the base. 



Var. erythrocarpa. Stem tall (5- 10) ; hrauchlets, cymes, and lower 

 surface of the large (2' -4') leaves tomeutose and hoary; petals and anthers 

 reddish ; berries red. 



Var. melanocarpa. Stem low (2 -4) ; brauchlets, cymes, and leaves 

 smooth or nearly so ; leaves small ; petals white ; berries black. (Arouia me- 

 lauocarpa, Ell.) Swamps. March - April. 



* * * Leaves unequally pinnate : cymes compound: fruit baccate. 



4. P. Americana, DC. Leaflets 13 -15, lanceolate, acuminate, serrate 

 above the middle, soon smooth ; cymes large, dense ; berry small, globose or 

 pear shaped, scarlet. Highest mountains of North Carolina. May -June. 

 A shrub or small tree. Fruit acid. 



18. AMELANCHIER, Medic. 



Calyx 5-cleft. Petals 5, oblong. Stamens numerous, short. Styles 5, more 

 or less united. Fruit baccate, containing 3-5 cartilaginous 2-seeded carpels ; 

 seeds separated by a false partition. Shrubs or small trees, with simple 

 leaves, and white flowers in terminal racemes. 



1. A. Canadensis, L., var. Botryapium, Torr. & Gray. Branches, 

 leaves, and racemes tomentose when young, soon smooth ; leaves elliptical, 

 abruptly acute, finely and sharply serrate, often slightly cordate ; racemes 

 slender, appearing before the leaves ; petals four times as long as the calyx ; 

 fruit globose, purplish. Woods. Feb. - March. A small tree, with smooth 

 whitish bark. 



Var. rotundifolia, Torr. & Gray. Shrubby ; leaves roundish oval, 

 somewhat acuminate, sharply serrate; racemes 6-10-flowered ; petals small, 

 narrowly oblong. (Aronia, Ell.) Low grounds, chiefly in the upper dis- 

 tricts. March. Shrub 2 - 3 high. 



The cultivated representatives of this order are the PLUM (Psuxus DO- 

 MESTICTTS, L.), APRICOT (P. ARMEXIACA, L.), CHERRIES (P. AVIUM and P. 

 CERASUS, L.), PEACH (PERSICA vn.<; ATMS, J/7//.). APPLE (PvRrs MALUS, L.), 

 PEAR (P. COMMTMS, L.), QUINCE (CvuoxiA VULGARIS, Pers.), and the 

 ALMOND (AJIYGDALUS). 



