1910.] NATURAL SCIENCES OF PHILADELPHIA. 207 



dark bluish green, scabrate or nearly smooth on the upper surface, pale 

 on the lower surface, 5-6 cm. long and 4-4.5 cm. wide, with slender 

 prominent midribs and primary veins; petioles stout, slightly wing- 

 margined at the apex, glandular, with usually persistent glands, 2.5-3 

 cm. in length; leaves on vigorous shoots thicker, usually rounded 

 at the base and often 6-7 cm. long and wide, with stout winged con- 

 spicuously glandular petioles. Flowers 2 cm. in diameter, on long slender 

 pedicels in 7- or 8-flowered corymbs ; calyx-tube narrowly obconic, the 

 lobes long, slender, acuminate, entire or minutely dentate near the middle, 

 reflexed after anthesis; stamens 7 or 8; anthers dark rose color; styles 

 3 or 4. Fruit ripening early in October, on slender drooping pedicels, 

 in few-fruited clusters, obovate, full and rounded at the apex, slightly 

 narrowed to the rounded base, orange-red, marked by small pale dots, 

 1-1.2 mm. long and broad; calyx little enlarged, with a deep narrow 

 cavity pointed in the bottom, and small spreading and closely appressed 

 lobes dull red on the upper side below the middle; flesh thin, dry and 

 hard; nutlets 4 or 5, rounded at the apex, gradually narrowed and 

 rounded at the base, rounded and slightly grooved on the back, 6.5-7 

 mm. long and about 4 mm. wide. 



A shrub sometimes 5 m. high, with stout stems covered with dark 

 scaly bark, and slender slightly zigzag branchlets dark dull chestnut 

 brown and marked by small pale lenticels in their first season and 

 dull gray-brown the following year, and armed with very stout nearly 

 straight purplish spines 2.5-3 cm. long. 



Country Club, Scranton, Lackawanna County, A. Twining, (No. 

 44 type) October 4, 1907, May 24 and September 19, 1908, B. H. 

 Smith, A. Twining and C. S. Sargent, May 24, 1908; Taylor's Hill, 

 near Scranton, A. Twining, (No. 43) June 8, 1907. 

 21. Crataegus coerulea n. sp. 



Glabrous with the exception of the hairs on the upper surface 

 of the young leaves. Leaves ovate to oval, acuminate, abruptly or 

 gradually narrowed and rounded or cuneate at the base, finely often 

 doubly serrate, with straight glandular teeth, and slightly divided 

 into 4 or 5 pairs of narrow acuminate lateral lobes; deeply tinged 

 with red when they unfold, about one-half grown when the flowers 

 open at the end of May and then thin, dark bluish green, smooth 

 and slightly hairy above, with short soft hairs, and paler below, 

 and at maturity thin, dark blue-green and smooth on the upper 

 surface, pale blue-green on the lower surface, 3-4 cm. long and 

 2.5-3.5 cm. wide; petioles slender, slightly wing-margined at the 

 apex, glandular, with minute usually deciduous glands, 1-1.3 cm. 



