1910.] NATURAL SCIENCES OF PHILADELPHIA. 163 



anthesis; stamens 8-14; anthers pale pink; styles 2 or 3. Fruit on 

 long drooping pedicels, in few-fruited clusters, subglobose to short- 

 oblong, flattened at the ends, russet-green to dark purplish red, 

 pruinose, becoming lustrous, 1.1-1.4 cm. in diameter; calyx little 

 enlarged, with a deep narrow cavity, and small spreading often decidu- 

 ous lobes; flesh thin, light yellow-green, hard and bitter; nutlets 2 or 

 3, obtuse at the ends, irregularly grooved, often pentagonal, 9-10 mm. 

 long and 5-6 mm. wide. 



A tree sometimes 5 m. high, with a trunk 2-2.5 dm. in diameter and 

 covered with dark gray bark separating in large flakes, large wide- 

 spreading horizontal branches forming a flat-topped head, and stout 

 nearly straight glabrous branchlets, light orange-green more or less 

 tinged with red when they first appear, becoming dark chestnut-brown 

 and lustrous in their first season and darker-colored the following 

 year, and armed with numerous slender straight chestnut brown spines 

 3.5-5 cm. long, persistent, abundant and often 1.5 dm. long on old 

 stems. 



Ravines, Schenley Park, Allegheny County, J. A. Shafer, (No. 7 

 type) May and October, 1902, O. E. Jennings, B. H. Smith and C. 8. 

 Sargent, (No. 7) September 28, 1905, O. E. Jennings, October 18, 1907, 

 June 10, 1908; common on dry hills in the neighborhood of Pittsburg. 

 5. Crataegus praestans n sp. 



Glabrous. Leaves slightly obovate, acute and sometimes pointed 

 at the apex, gradually narrowed to the long slender entire base and 

 finely often doubly serrate above the middle, with straight glandular 

 teeth; more than half grown when the flowers open at the end of May 

 and then thin, dark yellow-green and lustrous above and paler below, 

 and at maturity thin, dark green, 5-6 cm. long and 2-2.5 cm. wide, 

 with thin midribs and primary veins; petioles slender, narrowly 

 wing-margined to below the middle, 2-2.5 cm. in length; leaves on 

 vigorous shoots coarsely serrate, occasionally slightly lobed above 

 the middle, often 7-8 cm. long and 3.5-4 cm. wide. Flowers 1.2- 

 1.8 cm. in diameter, on long slender pedicels, in wide lax 12-20-flowered 

 corymbs, the lower peduncles from the axils of upper leaves; calyx- 

 tube narrowly obconic, the lobes long, slender, acuminate, entire, 

 reflexed after anthasis; stamens 11-14; anthers light rose pink: >tyles 

 2 or 3. Fruit ripening late in September, on long slender pedicels, 

 in drooping few-fruited clusters, short-oblong to oval, obtuse at the 

 apex, the rounded base often decurrent on the petiole, dark red, 

 slightly pruinose, marked by minute dark dots; calyx little enlarged, 

 with a short tube, a narrow deep cavity pointed in the bottom, and 



