1910.] NATURAL SCIENCES OF PHILADELPHIA. 233 



at the apex than at the base, only slightly ridged on the back, 5.5-6 

 mm. long and about 4 mm. wide. 



A shrub 1.5-2 m. high, with small ascending stems and branches 

 covered with close dark bark, slender nearly straight 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 reddish brown the following year, and armed with numerous 

 stout nearly straight purple spines 2.5-3 cm. long. 



Serpentine Ridge north of West Chester, Chester County, B. H. 

 Smith, (No. 21 type) May 17 and October 5, 1909, B. H. Smith and 

 Dr. W. T. Sharpless, May 22, 1909. 



4. Crataegus laetula n. sp. 



Glabrous with the exception of a few hairs on the young leaves 

 and petioles. Leaves ovate to oval, acute or acuminate and often 

 short-pointed at the apex, cuneate or rounded at the base, coarsely 

 doubly serrate, with straight glandular teeth, and very slightly divided 

 above the middle into 2 or 3 pairs of small lobes; more than half- 

 grown when the flowers open about the 20th of May and then thin, 

 yellow-green and furnished with a few hairs along the upper side of 

 the slender midribs and veins, and at maturity thin, dark yeliow-green, 

 smooth and lustrous on the upper surface, pale on the lower surface, 

 3.5-4.5 cm. long and 2.5-3 cm. wide; petioles slender, slightly wing- 

 margined at the apex, sparingly villose early in the season, soon becom- 

 ing glabrous, glandular, with persistent glands, rose colored in the 

 autumn, 1-1.5 cm. in length. Flowers 1.6 cm. in diameter, on long 

 stout pedicels, in broad 3-6-flowered corymbs, with long broad ligulate 

 laciniately glandular-serrate conspicuous bracts and bractlets persis- 

 tent until after the petals fall; calyx-tube broadly obconic, the lobes 

 gradually narrowed from wide bases, short, acute, laciniately glandular- 

 serrate above the middle, reflexed after anthesis; stamens 6-10; 

 anthers white, becoming pale yellow; styles 3 or 4. Fruit ripening 

 in October, on elongated slender pedicels, in few-fruited drooping 

 clusters, depressed-globose, full and rounded at the ends, deep dull 

 red, about 1 cm. long and 1.3 cm. wide; calyx little enlarged, with a 

 deep wide cavity broad in the bottom, and spreading and reflexed 

 often deciduous lobes; flesh thick, yellow, dry and firm; nutlets 3 or 

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

 with a low narrow ridge, 5-5.6 mm. long and about 4 mm. wide. 



An intricately branched shrub 2-3 in. high, with small stems covered 

 with dark bark, and slender nearly straight branchlets dark orange- 

 green and marked by pale lenticels when they first appear, becoming 



