POM ACE AE. 521 



brous. Leaves ovate to oval, dark green and shining above, paler beneath, 6-10 

 cm. long, 3-5 cm. wide, sharply irregularly serrate and slightly lobed, the slender 

 petiole about one third the length of the blade; pedicels slender; fruit pyriform, 

 about 1.4 cm. long and I cm. in diameter, pruinose. Calyx-lobes entire. Tan- 

 nersville, Penn., July 4, 1896. 



16. Crataegus pruinosa (Wendl.) Beadle. Pruinose Thorn. A shrub or 

 small tree. Spines long and slender. Leaves ovate, acute, incised-serrate and 

 somewhat lobed, thin, slender- petioled, 6-8 cm. long, glabrous or nearly so; fruit 

 globose, pruinose, about 10 mm. in diameter. Va. to N. Car. and Mo. [Afespilus 

 pruinosa Wendl. ] 



17. Crataegus apiifolia (Marsh.) Michx. Parsley Haw. Parsley-leaved 

 Thorn. (I. F. f. 1997.) A shrub or small tree. Spines stout. 2-5 cm. long; 

 leaves slender-petioled, broadly ovate or nearly orbicular in outline, pubescent on 

 both sides at least when young, truncate or slightly cordate at the base, 1-3 cm. 

 long, thin, pinnately and deeply 5 -7 -cleft, the lobes sharply serrate; flowers 8-12 

 mm. broad ; calyx-lobes linear, glandular ; styles 1-3 ; fruit red, oval, 4-6 mm. 

 long. In thickets, Va. to Fla., Mo. and Tex. March-April. 



18. Crataegus coccinea L. Scarlet Thorn or Haw. Red Haw. (I. 

 F. f. 1998.) A shrub or sometimes a small tree. Spines stout, 3-5 cm. long; 

 leaves slender-petioled, broadly ovate or orbicular, acute or acuminate at the apex, 

 mostly truncate or subcordate at the base, thin, or becoming firm, sharply incised 

 and serrate, the teeth glandular-tipped ; pedicels, bractlets and calyx somewhat 

 glandular-pubescent ; flowers 1.5-3 cm. broad; calyx-lobes lanceolate; styles 3-5; 

 fruit red, globose or oval, 10-16 mm. in diameter, rarely hairy. Thickets, Newf. 

 to Manitoba, Fla. and Tex. April-May. 



19. Crataegus rotundifolia (Ehrh.) Borck. Glandular Thorn. (I. F. f. 

 1999.) A shrub, similar to the preceding, the spines slender. Leaves mostly 

 smaller, slender-petioled, glabrous or very nearly so, oval, ovate, obovate, or some 

 of them nearly orbicular, incised-serrate with gland-tipped teeth, or sometimes 

 lobed, acute, most of them narrowed or cuneate at the base; bractlets and calyx- 

 lobes very glandular; flowers 1.5-2.5 cm. broad; fruit globose to oval, red, 8-16 

 mm. long. Conn, to Ind., Fla. and Ala. April-June. 



20. Crataegus occidentalis Britton. River-bank Thorn. Pedicels, calyx 

 and lower leaf-surfaces pubescent. Thorns stout, 3 cm. long or more. Leaves 

 oval or slightly obovate, irregularly serrate and sometimes slightly lobed, mostly 

 obtuse at the apex, and narrowed or subcuneate at the base, 4-7 cm. long, 3 or 4 

 cm. wide, slender-petioled; flowers about 1.5 cm. wide; fruit oval-globose, about 

 1 cm. long. River banks. Neb., Colo., Wyo. and Mont. 



21. Crataegus tenuifolia Britton. Thin-leaved Thorn. A shrub, the 

 thorns slender, slightly curved, 5-6 cm. long. Leaves very thin, even when ma- 

 ture, ovate, acute or short-acuminate at the apex, narrowed, or some of them sub- 

 truncate at the base, incised-serrate and lobed, with short hairs on the upper sur- 

 face, 6-10 cm. long, the very slender petiole half the length of the blade or longer; 

 pedicels slender; fruit pyriform, over I cm. long, 8-9 mm. thick, the calyx-lobes 

 glandular-serrate. S. W. Va. Type from South Fork of the Holston River, June 

 15, 1892. 



22. Crataegus macracantha Lodd. Long-spined Thorn. (I. F. f. 2000.) 

 A shrub or small tree, the bright brown thorns 5-13 cm. long. Leaves dull, 3-9 

 cm. long, usually with a few hairs on the prominent veins beneath, sharply and 

 often doubly serrate with gland-tipped teeth, narrowed or cuneate at the base; ped- 

 icels often pubescent ; calyx and bractlets glandular; flowers numerous, 12-16 

 mm. broad ; fruit globose or oval, 6-8 mm. in diameter. Quebec to Dak., Va. 

 and Mo. May-June. 



23. Crataegus mollis (T. & G.) Scheele. Red-fruited Thorn. (I. F. f. 

 2001.) A shrub or small tree. Leaves generally broadly ovate, truncate at the 

 base, sometimes 13 cm. long, incised and sharply serrate with gland-tipped teeth, 

 roughish above, pubescent beneath, especially when young ; twigs, petioles and 

 calyx densely pubescent; calyx-lobes usually incised and glandular: flowers 1.5-2.5 

 cm. broad; fruit bright red, 2-3 cm. in diameter, hairy. Thickets, Quebec to 

 Mich., Xeb., Kans., Penn., La. and Tex. April-May. 



24. Crataegus Biltmoreana Beadle. Biltmore Thorn. Lower leaf- 



