1910.] NATURAL SCIENCES OF PHILADELPHIA. 157 



This is one of the largest and most abundant species in the neighbor- 

 hood of Pittsburg. 

 7. Crataegus aliena n. sp. 



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

 Leaves oblong-obovate, acute or acuminate, gradually narrowed to the 

 concave-cuneate entire base, and sharply often doubly serrate usually 

 only above the middle, with straight glandular teeth; nearly half- 

 grown when the flowers open from the middle to the 20th of May and 

 then thin, dull yellow-green, smooth and glabrous above with the 

 exception of a few hairs on the upper side of the midribs and paler 

 below, and at maturity thin but firm in texture, dark green and very 

 lustrous on the upper surface, pale yellow-green on the lower surface, 

 4-5 am. long and 2-2.5 cm. wide, with thin prominent midribs and 

 primary veins; petioles stout, narrowly wing-margined nearly to the 

 base, occasionally glandular early in the season, rose color in the 

 autumn, 7-8 mm. in length; leaves on vigorous shoots subcoriaceous, 

 abruptly long-pointed at the apex, more coarsely serrate, occasionally 

 slightly lobed, often 5-6 cm. long and 4-5 cm. wide. Flowers 1.2-1.4 

 cm. in diameter, on long slender pedicels, in broad mostly 12-15- 

 flowered corymbs, the elongated lower peduncles from the axils of 

 upper leaves; calyx-tube narrowly obconic, the lobes long, slender 

 acuminate, entire or minutely dentate, reflexed after anthesis; stamens 

 10; anthers light cream color; styles 1 or 2, usually 2. Fruit ripening 

 early in October, on long drooping red pedicels, in few-fruited clusters, 

 short-oblong to slightly obovate, crimson, lustrous, marked by large 

 pale dots, 1-1.2 cm. long and 9-10 mm. in diameter; calyx little 

 enlarged, with a narrow deep cavity pointed in the bottom, and small 

 spreading often deciduous lobes; flesh thin and hard; nutlets 1 or 2, 

 gradually narrowed and rounded at the ends, ridged on the back, 

 with a high broad slightly grooved ridge, 7.5-S mm. long and 4-4.4 mm. 

 wide, or when 1, 6-6.5 mm. in diameter. 



A tree 5 or 6 m. high, with a tall trunk 1.5-2 dm. in diameter and 

 covered with dark scaly bark, small spreading branches forming a 

 wide round-topped symmetrical head, and stout only slightly zigzag 

 branchlets light orange-green and marked by pale lenticels when they 

 first appear, becoming light reddish brown in their first season and 

 gray tinged with red the following year, and armed with numerous 

 stout nearly straight light red-brown spines 4-5 cm. long. 



Hillsides, valley of Blacklog Creek, near Orbisonia, Huntingdon 

 County, B. H. Smith, (No. 309, type) May 19 and October 9, 1906, 

 October 8, 1907. 



