8o Rose (Rosacece) 



14. Family ROSACES. (Rose Fam.) 



Flowers, regular. Petals, five, not united, inserted with the stamens on 

 the edge of a disk that lines the tube of the calyx. Sepals, five, 

 united toward the base, often accompanied outside by a row of 

 small, leaf-like bracts. Stamens, numerous [or in Spiraea (2) 

 sometimes as few as ten] inserted as above. Seed-case, one to 

 many, free from the calyx excepting in Pyrus (6), Crataegus (7), 

 and Amelanchior (<s), and in the Genus Rosa (5), where the many 

 pistils are imbedded in the inner surface of the more or less 

 rounded calyx-tube. 



Leaves, usually simple [compound in Rosa (5) and in Rubus (4) ex- 

 cepting in one species], alternate, usually with leaf-like bracts 

 (stipules) at the base of the leaf-stem. 



GUIDE TO THE GENERA. 



(a) Seed-case, one to many, free, and not (as in Rosa) covered in ripening by 

 the calyx. 



(b) Seed-case, one . Leaves, simple. Fruit, a drupe. (l) Prunus(Plum, 



Cherry). 



(b) Seed-cases, mostly five, one-celled, two- to several-seeded. Fruit, a 

 follicle. 



(c\ Leaves, simple. (2) Spinfea (Meadow-Sweet, etc.). 

 (c) " lohed. (3) Physocarpus (Nine-Bark). 



(b) Seed-cases, numerous, crowded on a lengthened, spongy receptacle, 

 becoming fleshy in fruit. Leaves compound (except in Flowering 

 Raspberry). Fruit, crowded drupelets. (4) Rubus (Blackberry 

 etc). 



(a) Seed-case, one to many, adherent to the calyx tube, or (in Rosa) covered in 

 ripening by the calyx. 



(2) Seed-cases, many, becoming bony nutlets enclosed in the rounded, 

 fleshy calyx-tube, and appearing like a small apple. Leaves, 

 compound. Fruit, clustered akenes, but apparently a pome. 

 (5) Rosa (Rose). 



(2) Seed-case, one, imbedded in the fleshy calyx tube. Leaves, simple. Fruit, 

 a pome. (6) Pyrus (Chokeberry, etc.), (7) Crat&gus (Thorn, Haw), (8) 

 Amelanchior (Juneberry). 



(i) Genus PRIJNUS, Tourn. (Plum, Cherry.) 



Flowers, white, in clusters, excepting in the third species 

 (sloe), with or preceding the leaves, excepting in the 

 fourth species (Choke-Cherry). Petals, five, much 

 spreading. Sepals, five. Stamens, fifteen to twenty. 

 Seed-case, one, free from the calyx, with two young 

 seeds, only one of which usually ripens. 



Leaves, simple, alternate, toothed. 

 Fruit, fleshy, with a bony stone. 



