174 POMACEAE 



2. Sorbus sambucifolia (C. & S.) Roem. WESTERN Mountain 

 Ash. (Man. p. 515 ; I. F. f. 1976.) lu moist ground, Lab. to Alaska, 

 Pa., Mich, and in Rocky Mts. to Colo, and Viah.— Pennsylvania : Lu- 

 zerne, Wilkesbarre ; Ai,i,EGHENY, escaped. 



2. PYRUS L. 



1. Pyrus communis L. Pear. (Man. p. 515; I. F. /. 1977.) In 

 thickets and woods, Me. to Pa., and the Gulf States. Native of Eu. and 

 Asia. — Pennsylvania : Delaware ; Lancaster. 



3. MALUS Juss. 



Leaf-blades glabrous at least at maturity. 



Leaf-blades oblong or lanceolate : styles nearly distinct, i. M. angusiifolia. 



Leaf-blades ovate : styles manifestly united at the base. 2. 31. coronaria. 

 Leaf-blades persistently pubescent, often tomentose beneath. 



3. M. Mains. 



1. Malus angustifolia (Ait.) Michx. Narrow-leaved Crab-applE. 

 (Man. p. 516; I. F. /. 197S.) In thickets, N. J. to Kans., Fla. and Ga. 

 — Pennsylvania : Crawford ; Allegheny ; Somerset ; Westmore- 

 land. 



2. Malus coronaria yL,.) Mill. American Crab-applE. (Man. p. 



516 ; I. F. /. 1979.) In thickets, Ont. to Mich., N. J. and S. Q.— Penn- 

 sylvania : Bucks; Delaware; Chester; Lancaster; Lebanon; 

 Schuylkill ; Franklin ; Huntingdon ; Allegheny. 



3. Malus Malus (L.) Britton. Apple. (Man. p. 516; I. F./. 19S2.) 

 In woods and thickets, N. Y., N. J. and Pa., to the Gulf States. Introd. 

 from Eu. — Pennsylvania : Northampton ; Chester ; Delaware ; 

 Allegheny. 



4. ARONIA Pers. 



Lower surfaces of the leaves and the cyme-branches woolly : fntit red. 



I. A. arbiitifolia. 

 Lower surfaces of the leaves and the cyme-branches glabrous or essentially 

 so: fruit purplish. 2. A. nigra. 



1. Aronia arbutifolia (L.) Ell. Red Choke-berry. (Man. p. 



517 ; I. F. f. 1983.) In swamps and wet woods, N. S. to Minn., Fla. and 

 La. — Pennsylvania : Northampton ; Montgomery ; Franklin ; Lan- 

 caster ; Fulton ; Crawford ; EriE- 



2. Aronia nigra (Willd.) Britton. Black Choke-berry. (Man. p. 

 517 ; I. F. /. 19S4.) In swamps or low woods or sometimes in drier soil, 

 N. S. to Ont. and Fla. — Pennsylvania : Lackawanna ; Monroe ; 

 Schuylkill ; Luzerne ; Northampton ; Bucks ; Delaware ; Ches- 

 ter ; Lancaster; Huntingdon; Erie; Somerset; Allegheny. 



5. AMELANCHIER Medic. 



A. Flowers in racemes : fruit globular. 



Leaf-blades acute or acuminate at the apex : top of the ovary glabrous or 

 nearly so. 



