176 POMACEAE 



L,eaf-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, typicall5' narrowed or cuneate at 

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

 Fruit globose or spheroidal. 13. C. Biltmoreana. 



Fruit oval or oblong-oval. 14. C. lomeritosa. 



B. Corymbs 2-6-flowered, or the flowers sometimes solitarj'. 

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



15. C. Vailiae. 

 l,eaf-blades obovate or oblong-cuneiform : fruit yellow or greenish yellow. 



16. C. uniflora. 



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

 f. 1991.) lu thickets, Quebec to Man., N. H., Fla. and Tex. — Pennsyl- 



va?iia : Bucks ; Dei,aware ; Chester ; Lancaster ; Lebanon ; Frank- 

 i,iN ; AIvLEGheny. 



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

 520; I. F. f. 1993.) In thickets, Quebec and Ont., to Iowa and Ga. — 

 Pemisylvafiia : Northampton ; Pike ; Bucks ; Delaware ; Chester ; 

 Columbia ; Cambria ; Huntingdon ; Somerset ; Allegheny. 



2a. C. punctata canescens Britton. (Man. p. 520. ) Vt. to Out., Pa. 

 and Ohio. — Pennsylvania : Northampton, near Easton. 



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

 520; I. F.y. 1994.) In woods and thickets, Va. to Ga, IIL and Teun. 

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

 ware ; Chester ; Lancaster ; Lebanon. 



4. Crataegus Oxyacantha L. Hawthorn. (Man. p. 520; I. F. f. 

 J995.) Along roadsides and in thickets, escaped. — Pennsylvania: Phil- 

 adelphia ; Delaware ; Northampton ; Lancaster : Luzerne ; 

 Allegheny. 



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

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



6. Crataegus Canbyi 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. and Tex. — Pennsylvania : Pike; 

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

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



9. Crataegus rotundlfolia (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 \a.— Pennsylvania : Delaware. 



