176 POMACBA.E 



Leaf -blades ovate-orbicular, typically cordate or truncate at the base : 



fruit mostly over 2 cm. in diameter. 12. C. mollis. 



I<eaf-blades obovate, oval or ovate, typically narrowed or cuneate at 

 the base : fruit less than 2 cm. in diameter. 

 Fruit globose or spheroidal. 13. C. Billmoreana. 



Fruit oval or oblong'-oval. 14. C. iomentosa. 



B. Corymbs 2-6-iiowered, or the flowers sometimes solitary. 

 Leaf-blades ovate or oval, mostly acute : fruit red at maturity. 



15. C. Vailiae. 

 Leaf-blades obovate or oblong-cuneiform : fruit yellow or greenish yellow. 



16. C. uniflora. 



1. Crataegus Crus-Galli L,. Cockspur Thorn. (Man. p. 519 ; I. P. 

 f. 199T.) lu thickets, Quebec to Man., N. H., Fla. and Tex. — Pennsyl- 

 vania : Bucks ; Dbi<awarb ; Chester ; Lancaster ; Lebanon ; Frank- 

 I,IN ; Ai,i,EGheny. 



2. Crataegus punctata Jacq. Large-FRUITEd Thorn. (Man. p. 

 520; I. F. f. /ppj.) In thickets, Quebec and Ont., to Iowa and Ga. — 

 Pennsylvania : Northampton ; Pike ; Bucks ; Delaware ; Chester ; 

 Coi,umbia ; Cambria ; Huntingdon ; Somerset ; Ai,i,egheny. 



2a. C. punctata canescens Britten. (Man. p. 520. ) Vt. to Ont., Pa. 

 and Ohio. — Pennsylvania : Northampton, near Easton. 



3. Crataegus cordata (Mill. ) Ait. Washington Thorn. (Man. p. 

 520; I. V.f. igp4.) In woods and thickets, Va. to Ga, 111. and Tenn. 

 Naturalized in Pa. and N. J. — Pennsylvania : Philadelphia ; Dela- 

 ware ; Chester ; Lancaster ; Lebanon. 



4. Crataegus Oxyaoantha L. Hawthorn. (Man. p. 520; I. F. /. 

 /pp5.) Along roadsides and in thickets, escaped. — Pennsylvania : Phil- 

 adelphia ; DELAWARE ; Northampton ; Lancaster : Luzerne ; 

 Allegheny. 



5. Crataegus Porter! Britton. PORTER'S Thorn. (Man. p. 520.). 

 In woods, Pa. and N. Y. — Pennsylvania : Monroe, Tannersville. 



6. Crataegus Canbyl Sargent. In hedges and thickets, Pa. and 

 Del. — Pennsylvania: Delaware, Tinicum. 



7. Crataegus pruinosa (Wendl.) Beadle. Pruinose Thorn. (Man. 

 p. 521.) In hedges or thickets, Pa. to N. C. and Mo. — Pennsylvania: 

 Bucks. 



8. Crataegus coccinea L. Scarlet Thorn. (Man. p. 521 ; I. F. /. 

 1998.) Thickets, Newf. to Man., Fla. anATa^.— Pennsylvania : Pike ; 

 Schuylkill ; Northampton ; Columbia ; Bucks ; Delaware ; Ches- 

 ter ; Lancaster ; York ; Franklin ; Fulton ; Somerset. 



9. Crataegus rotundifolia (Ehrh.) Borck. Glandular Thorn. 

 (Man. p. 521 ; I. F. /. 1999.) In open woods. Conn, to Ind., Fla. and 

 Ala.— Pennsylvania : Pike; Monroe; Northampton; Lancaster; 

 Lebanon ; Somerset ; Bucks. 



10. Crataegus tenuifolia Britton. Thin-leaved Thorn. (Man. p. 

 521.) In woods and thickets. Pa. and Va.— Pennsylvania : Delaware. 



