174 POMACEAB 



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

 ASH. (Man. p. 515 ; I. F. /. 1976.) In moist ground, Lab. to Alaska, 

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

 zerne, Wilkesbarre ; AeLEGhENY, escaped. 



2. PYRtrS L. 



1. Pyrus commmilB L. PEAR. (Man. p. 515; I. F. /. 1977.) In 

 thickets and wpods, Me. to Pa. , and the Gulf States. Native of Fu. and 

 Asia. — Pennsylvania : Delaware ; Lancaster- 



3. MALUS Juss. 



Leaf-blades glabrous at least at maturity. 1 



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

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



Leaf-blades persistently pubescent, often tomentose beneath. 



3. M. Malus. 



1. Malus angustifolia (Ait.) Michx. Narrow-i,eavEd Crab-applE. 

 (Man. p. 516 ; I. F. /. 1978.) In thickets, N. J. to Kans., Fla. and Ga. 

 — Pennsylvania : Crawford ; Ai,i<EGheny ; Somerset ; Westmore- 



I,AND. 



2. Malus coronaria (L. ) Mill. American Crab-appi,E. (Man. p. 

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

 sylvania : Bucks; Dei,aware; Chester; Lancaster; Lebanon; 

 ScHUYi.Kii,i, ; Franki,in ; Huntingdon ; Ai,i,egheny. 



3. Malus Malus (L.) Britten. Appi,E. (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 ; 

 Ali,EGheny. 



4. ARONIA Pers. 



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



I. A. arbutifolia. 

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

 so : fruit purplish. ■^. A. nigra. 



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

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

 La. — Pennsylvania : Northampton ; Montgomery ; Franki,in ; Lan- 



_ caster ; FuwoN ; Crawford ; Erie. 



2. Aronia nigra (Wind.) Britton. Black ChokE-berry. (Man. p. 

 517 ; I. F. _/; 1984.) 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. AMBLANCHIER Medic. 



A. Flowers in racemes : fruit globular. 

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

 nearly so. 



