1910.] NATURAL SCIENCES OF PHILADELPHIA. 175 



chestnut brown and marked by small pale lenticels in their first 

 season and dark red-brown the following year, and armed with numer- 

 ous slender straight or slightly curved purplish shining spines 3-5 

 cm. long. 



Hillside, Dunmore, near Scranton, Lackawanna County, A. Twining, 

 (No. 26 type) May 28 and September 22, 1907. 

 12. Crataegus advena n. sp. 



Glabrous with the exception of the hairs on the young leaves and 

 petioles. Leaves ovate, acuminate, abruptly concave-cuneate or 

 rounded at the base, sharply often doubly serrate, with straight 

 glandular teeth, and very slightly divided into 3 or 4 pairs of small 

 spreading lobes; nearly half-grown when the flowers open the middle 

 of May and then very thin, light yellow-green, smooth and slightly 

 hairy above along the midribs and paler and glabrous below, and at 

 maturity thin, dark yellow-green, smooth and lustrous on the upper 

 surface, pale on the lower surface, 4.5-5 cm. long and 3.5-4 cm. 

 wide, with thin prominent midribs and primary veins ; petioles slender, 

 slightly wing-margined at the apex, glandular, with minute stipitate 

 deciduous glands, slightly villose on the upper side while young, soon 

 becoming glabrous, 2-3 cm. in length. Flowers 1.8 cm. in diameter, 

 on long slender pedicels, in rather compact mostly 5-11-flowered 

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

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

 base, long, slender, acuminate, slightly glandular-serrate near the 

 apex, reflexed after anthesis; stamens 15-20; anthers dark pink; 

 styles 3-5, surrounded at the base by a broad ring of pale tomentum ; 

 Fruit ripening early in October, on long slender red pedicels, in few- 

 fruited clusters, subglobose to slightly obovate, full and rounded at 

 the ends, green when fully grown becoming red at maturity, pruinose, 

 marked by small dark dots, 1.5 cm. in diameter; calyx little enlarged, 

 with a short tube, a deep narrow cavity pointed and tomentose in 

 the bottom, and small spreading lobes ; flesh thin, firm and green ; 

 nutlets 3-5, gradually narrowed and rounded at the ends, rather 

 broader at the base than at the apex, prominently ridged on the back, 

 with a high broad deeply grooved ridge, 6-8 mm. long and about 

 6 mm. wide. 



A tree 3-4 m. high, with a tall trunk 6-7 cm. in diameter, covered 

 with dark scaly bark, small spreading intricately branched branches 

 forming a wide compact handsome head, and stout nearly straight 

 zigzag branchlets dark orange-green and marked by pale lenticels 

 when they first appear, becoming light chestnut brown and lustrous 



