212 PROCEEDINGS OF THE ACADEMY OF [March, 



lobes dark red on the upper side below the middle; flesh yellow, sweet 

 and of pleasant flavor; nutlets 2-4, gradually narrowed and rounded 

 at the ends, ridged on the back, with a low slightly grooved ridge, 

 5-6 nun. long and 3-4 mm. wide. 



A shrub 2-3 m. high, with small erect stems covered with green- 

 gray bark, and slender only slightly zigzag branchlets, dull chestnut 

 brown and marked by large pale lenticels in their first season and 

 dull gray-brown the following year, and armed with stout light brown 

 ultimately gray spines 2.5-3 cm. long. 



Woods. Birdseye, near Scranton, Lackawanna County, A. Twining, 

 (No. 61 type) October 23, 1907. 

 C. Crataegus siderea d. bp. 



Glabrous with the exception of the hairs on the upper surface 

 of the young leaves. Leaves ovate to oval or obovate, acuminate, 

 gradually or abruptly narrowed to the entire base, finely doubly 

 serrate above, with straight glandular teeth, and deeply divided often 

 only above the middle into long narrow spreading or recurved acumin- 

 ate lobes, about half-grown when the flowers open the middle of May 

 and then very thin, yellow-green, and covered above by short white 

 hairs and pale and glabrous below, and at maturity thin, yellow-green 

 and scabrate on the upper surface, pale on the lower surface, 4-6 cm. 

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

 veins; petioles slender, slightly wing-margined at the apex, 2-2.5 

 cm. in length. Flowers 1 cm. in diameter, on long slender pedicels, 

 in small 4- or 5-flowered corymbs, the lower peduncles from the axils 

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

 acuminate, entire, reflexed after anthesis; stamens 7-9, usually 8; 

 anthers rose color; styles 3 or 4. Fruit ripening late in September, 

 on long slender pedicels, in drooping clusters, obovate, gradually 

 narrowed to the long base, light yellow-green, becoming dark red 

 when fully ripe, marked by small dark dots, 1-1.2 cm. long and 9-10 

 mm. in diameter near the rounded apex; calyx little enlarged, with a 

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

 and reflexed closely appressed lobes; flesh thin, dry and mealy; nutlets 

 3 or 4, narrowed and rounded at the ends, rounded and slightly ridged 

 on the back, 5-5.5 mm. long and 3.5-4 mm. wide. 



A shrub 3-4 m. high, with small stems, and slender zigzag branchlets 

 dark orange-green and marked by pale lenticels when they first appear, 

 becoming light chestnut brown and lustrous in their first season and 

 dull red-brown the following year, and armed with numerous slender 

 straight or slightly curved chestnut brown spines 2-3 cm. long. 



