POM ACE AE. 179 



4a. Rosa humilis villosa Best. M. p. 514. 



Bucks— Point Pleasant, Dr. Geo. Best (Fr.). 



5. Eosa canina L. Dog Rose. M. p. 514. Eoadsides and waste places. 



Summer. 



6. Bosa rubiginosa L. Sweetbrier, Eglantine. M. p. 514. Eoadsides and 



waste places. Early summer. 



[S Eosa setigera Michx. Prairie Rose. M. p. 513. Escaped from 

 cultivation. Early summer. 

 Bosa cinnamomea L. Cinnamon Rose. M. p. 514. Occasionally 

 along roadsides. Summer. 



Family 12. POMACEAE L. Apple Family. 



Bipe carpels papery or leathery. 



Cavities of the ovary (carpels) as many as the styles. 



Flesh of the pome with grit-cells. 1. Pyrus. 



Flesh of the pome without grit-cells. 



Cymes simple; trees. 2. Malus. 



Cymes ' compound ; shrubs. 3. Aronia. 



Cavities of the ovary becoming twice as many as the styles. 



4. Amelanchier. 

 Bipe carpels bony. 5. Crataegus. 



1, PYEUS L. 

 1. Pyrus communis L. Pear. M. p. 515. Thickets and woods, escaped 

 from cultivation. Spring. 



2. MALUS Hill. Apple. 



Leaves glabrous when mature. 



Leaves oblong, lanceolate or oval, narrowed at the base. 



1. M. angustifolia. 



Leaves ovate, cordate or rounded at the base. 2. M. coronaria. 



Leaves persistently pubescent or tomentose beneath. 3. M. Malus. 



1. Malus angustifolia (Ait.) Michx. M. p. 516. In thickets. Spring. 



Cape May — Cold Spring, C. F. Manderson (Br.). 



2. Malus coronaria (L.) Mill. Crab Apple. M. p. 516. Thickets. Spring. 



Philadelphia — Wissahickon (Je.), West Philadelphia (Mac.). Bucks— 

 Perkasie, Sellersville (Fr.). Delaware— Castle Bock (B. Sm.), Concord 

 (W. Tr.), Painters' Arboretum (Ke.). Chester — (P.). Lancaster — 

 (P.). Dauphin — Harrisburg, Steelton (Wn.). 



Mercer— Trenton (C). Somerset ^Peapack (C). Eunterdon— Hope- 

 well, Pittstown, Eosemont (C). 



New Castle— Stanton, Pencader. Scarce. 



3. Malus Malus (L.) Britton. Apple. M. p. 516. Escaped from cultiva- 



tion. Spring. 



3. AEONIA Medic. Chokeberrt. 



Cyme and lower surfaces of the leaves wooly. 1. A. arbutifolia. 



Cymes and leaves glabrous or nearly so; fruit black or purplish. 



2. A. nigra. 



1. Aronia arbutifolia (L.) Medic. M. p. 517. Swamps and damp thick- 

 ets. Spring. 



