1910.] NATURAL SCIENCES OF PHILADELPHIA. 215 



in diameter, and slender nearly straight branchlets dark orange-green 

 more or less tinged with red and marked by pale lenticels when they 

 first appear, becoming light chestnut red and lustrous in their first 

 season and dull red-brown or gray the following year, and armed with 

 occasional straight very stout gray spines 1.5-2 cm. long. 



Hillsides, Keyser Valley, Scranton, Lackawanna County, A. Twin- 

 ing, B. H. Smith and C. S. Sargent, (No. 68 type) May 23, 1908, 

 A. Twining, September 14, 1908, (No. 12) A. Twining, September 

 23, 1908. 

 10. Crataegus heidelbergensis n. sp. 



Glabrous with the exception of the hairs on the upper surface 

 of the young leaves. Leaves oblong-ovate, acuminate and long- 

 pointed at the apex, rounded or abruptly cuneate at the wide base, 

 finely often doubly serrate, with straight glandular teeth, and rather 

 deeply divided into 3-6, usually 5, pairs of narrow acuminate spreading 

 lobes; nearly half-grown when the flowers open from the 10th to the 

 middle of May and then light yellow-green and roughened above by 

 short white hairs and pale below, and at maturity thin, dark yellow- 

 green and scabrate on the upper surface, pale bluish green on the 

 lower surface, 4-6.5 cm. long and 2.5-4 cm. wide, with thin conspic- 

 uous midribs and primary veins; petioles slender, slightly wing- 

 margined at the apex, 1.5-2 cm. in length; leaves on vigorous shoots 

 usually rounded at the base, more coarsely serrate, more deeply lobed 

 and often 7-8 cm. long and 6 cm. wide. Flowers 1.4-1.7 cm. in 

 diameter, on long slender pedicels, in lax usually 6-12-flowered 

 corymbs, the long lower peduncles from the axils of upper leaves; 

 calyx-tube narrowly obconic, the lobes gradually narrowed from the 

 base, linear, acuminate and red at the apex, entire or minutely glan- 

 dular-dentate near the middle, reflexed after anthesis; stamens 5-8, 

 rarely 9; anthers purple; styles 2-5, usually 3 or 4, surrounded at the 

 base by a narrow ring of pale tomentum. Fruit ripening the end of 

 August and falling early in September, on long slender pedicels, in 

 few-fruited clusters, obovate or rarely short-oblong to subglobose, 

 scarlet frequently blotched with russet, marked by small pale dots, 

 occasionally slightly pruinose, 1.2-1.7 cm. long and 1.2-1.5 cm. thick; 

 calyx little enlarged, with a broad deep cavity tomentose in the 

 bottom, and spreading and appressed generally persistent lobes dark 

 red on the upper side below the middle; flesh orange-yellow slightly 

 tinged with red, soft and acid; nutlets usually 3 or 4, rounded at the 

 apex, acute at the base, rounded and slightly grooved or ridged on 

 the back, 5.5-6 mm. long and about 4 mm. wide. 



