1910.] NATURAL SCIENCES OF PHILADELPHIA. 231 



October, on short stout erect pedicels, in few-fruited clusters, short- 

 oblong to subglobose, green tinged with red, 1.1-1.2 cm. in diameter; 

 calyx prominent, with a wide shallow cavity broad and slightly 

 tomentose in the bottom, and small spreading lobes dark red on the 

 upper side; flesh green, dry and hard; nutlets 3 or 4, full and rounded 

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

 with a broad high deeply grooved ridge, 7-7.5 mm. long and 5 mm. 

 wide. 



A shrub 1-1.5 m. high, with stems covered with yellow-gray bark, 

 and stout nearly straight branchlets dark orange-green and marked 

 by large pale lenticels when they first appear, becoming light chestnut 

 brown and lustrous in their first season and dull red-brown the follow- 

 ing year, and armed with numerous slender straight or slightly curved 

 chestnut brown shining spines 1.5-2.5 cm. long. 



Lincoln Heights, Scranton, Lackawanna County, A. Twining, (No. 

 9 type) June 8 and October 5, 1907, (No. 46) October 5, 1907. 



This species is named for its discoverer, Mr. Alfred Twining, of 

 Scranton, who first called attention to the richness of Lackawanna 

 County in forms of Crataegus. 

 2. Crataegus leptalea n- sp. 



Glabrous with the exception of the hairs on the upper surface 

 of the young leaves. Leaves ovate, acuminate, abruptly cuneate or 

 rounded at the base, finely often doubly serrate, with straight glandular 

 teeth, and divided into 3 or 4 pairs of short broad acute lateral lobes; 

 nearly fully grown when the flowers open from the 20th to the 25th 

 of May and then thin, yellow-green and furnished above with occa- 

 sional white hairs and paler below, and at maturity thin, very smooth, 

 yellow-green, paler on the lower surface than on the upper surface, 

 3-4 cm. long and 2.5-3 cm. wide, with thin midribs and primary 

 veins; petioles slender, narrowly wing-margined to below the middle, 

 glandular, with minute persistent glands, 1-1.5 cm. in length; leaves 

 on vigorous shoots broadly ovate, rounded or abruptly cuneate at the 

 wide base, more coarsely serrate and more deeply lobed, and often 

 5-5.5 cm. long and broad. Flowers 1.5-2 cm. in diameter, on short 

 stout pedicels, in small compact 4-6-flowered corymbs, with large 

 conspicuous glandular bracts and bractlets, the lower peduncles 

 from the axils of upper leaves; calyx-tube narrowly obconic, the 

 lobes foliaceous, acuminate, laciniately glandular-serrate, reflexed 

 after anthesis; stamens 10; anthers white or cream color; styles 4 

 or 5. Fruit ripening in October, on stout erect pedicels, in mostly 

 3-5-fruited clusters, short-oblong to subglobose, about 1 cm. in diame- 



