588 PROCEEDINGS OF THE ACADEMY OF [Sept., 



scaly bark, and slender nearly straight branchlets marked by occasional 

 pale lenticels, dull red-brown and covered with a glaucous bloom when 

 they first appear, becoming lustrous and dull gray-brown in their 

 second year, and armed with few slender nearly straight purplish-brown 

 spines usually 3-6 or occasionally only 1-2 cm. in length, often becom- 

 ing compound on old stems. 



Berks county: Gravelly limestone bluffs along Tulpehocken creek, 

 North Heidelberg township, C. L. Gruber (No. 106, type!), 1902, May, 

 August and September, 1904. 



4. Crataegus arcana Beadle. 



Bilt. Bot. Studies, I, 122 (1902); Small, Fl. S. E. States, .564. Sargent, 



Bot. Gazette, XXXV, 101 (The Genus Crataegus in New Castle County, 

 Delaware) . 



Berks county: Limestone bluffs, Tulpehocken creek, North Heidel- 

 berg township, C. L. Gruber (No. 151), 1902, May, August and Septem- 

 ber, 1903. Bucks county : Near Sellersville, C. D. Fretz (Nos. 126, 141), 

 May, 1898, October, 1899, May and September, 1900, May, 1901. Del- 

 aware county: Preston Run Barrens, Newtown, B. H. ^mith (No. 229), 

 May and October, 1903; near Chadsford, B. H. Smith (No. 196), May 

 and September, 1902; W. M. Canhij, October 8, 1902. Also northern 

 Delaware to the elevated regions of western North Carolina. 



A shrubby species common in eastern Pennsylvania, with thin 

 cuneate leaves except on vigorous shoots, and fruits obconic at the base 

 and conspicuously swollen or mamillate below the middle. 



5. Crataegus philadelphica n. sp. 



Leaves ovate, acute or acuminate, full and rounded or subcordate at 

 the broad entire base, sharply doubly serrate above, with straight gland- 

 ular teeth, and divided above the middle into 3 or 4 pairs of small acute 

 spreading lobes, more than half-grown when the flowers open about the 

 10th of May and then membranaceous, light yellow-green and spar- 

 ingly villose above, especially on the midribs and veins, pale and gla- 

 brous below, and at maturity subcoriaceous, dark dull blue-green on 

 the upper, pale bluish-green on the lower surface, 4-4.5 cm. long and 

 3.5-4 cm. wide, with stout midribs and usually 4 pairs of thick primary 

 veins arching obliquely to the points of the larger lobes; petioles stout, 

 abruptly wing-margined at the apex, grooved on the upper side, gla- 

 brous, only occasionally glandular and 1.5-2 cm. in length; stipules 

 linear, acuminate, coarsely glandular, fading red, caducous; leaves on 

 vigorous shoots often broader than long and cordate or truncate at 

 the base. Flowers 2 cm. in diameter, on slender glabrous pedicels, in 

 compact few, usually 5-7-flowered corymbs; calyx-tube l^roadly ob- 



