1910.] NATURAL SCIENCES OF PHILADELPHIA. 197 



pedicels, in wide 5- to 10-flowered corymbs, the much elongated 

 lower pedicels from the axils of upper leaves ; calyx-tube narrowly 

 obconic, the lobes long, slender, acuminate, entire or occasionally 

 slightly dentate above the middle, sparingly hairy on the inner sur- 

 face, reflexed after anthesis; stamens 10; anthers dark rose color; 

 styles 3 or 4, surrounded at the base by a broad ring of long white 

 hairs. Fruit ripening late in September or early in October, on stout 

 pedicels in few-fruited spreading clusters, short-oblong or slightly 

 obovate, rounded at the ends, scarlet, lustrous, marked by large 

 pale dots, 1.1-1.3 cm. long and 1-1.1 cm. wide; calyx little enlarged, 

 with a wide shallow cavity, and spreading and appressed entire or 

 dentate lobes dark red on the upper side below the middle; flesh thick, 

 yellow, soft and succulent; nutlets 3 or 4, broad and rounded at the 

 apex, narrowed to the rounded base, ridged on the back, with a broad 

 low slightly grooved ridge, 7-8 mm. long and 4-4.5 mm. wide, with 

 a conspicuous hypostyle often extending to below the middle of the 

 nutlet. 



A shrub 7-8 m. high, with several stems, numerous erect branches 

 forming a narrow pyramidal head, and stout zigzag branchlets dark 

 orange-green more or less tinged with red and marked by large pale 

 lenticels when they first appear, becoming in their second season 

 light chestnut brown and very lustrous, and dull gray-brown the 

 following year, and armed with occasional stout slightly curved 

 spines 2.5-3 cm. long or often unarmed. 



Glades and borders of oak woods near the Maloney Home and 

 Country Club, Scranton, Lackawanna County, A. Twining, B. H. Smith 

 and C. S. Sargent, (No. 73 type) May 24, 1908, A. Twining, September 

 19 and October 10, 1909; (No. 74) A. Twining, September 29, 1908. 



This handsome species is very distinct in its remarkable fastigiate 

 habit. 

 11. Crataegus impervia n. sp. 



Glabrous with the exception of the hairs on the upper surface of 

 the young leaves. Leaves ovate, acuminate and often long-pointed 

 at the apex, broad and rounded or abruptly cuneate at the base, 

 sharply doubly serrate, with straight glandular teeth, and divided into 

 5 or 6 pairs of small acuminate spreading lateral lobes ; about one-third 

 grown when the flowers open in the last week of May and then yellow- 

 green, lustrous and roughened above by short soft white hairs and pale 

 below, and at maturity thin, dark yellow-green, smooth, and lustrous 

 on the upper surface, pale on the lower surface, 4.5-6 cm. long and 

 4.5-5 cm. wide, with stout midribs, and thin primary veins arching 



