1910.] NATURAL SCIENCES OF PHILADELPHIA. 173 



appear, becoming light chestnut brown, lustrous, and marked by dark 

 lenticels in their first season and darker colored the following year, 

 and armed with very numerous slender straight purple spines 3-4 cm. 

 long. 



Fern Hollow, Pittsburg, Allegheny County, 0. E. Jennings, (No. 38 

 type) October 9, 1905, May 18, 1906. 



9. Crataegus denudata n. sp. 



Glabrous with the exception of the hairs on the young leaves. 

 Leaves ovate, acute or acuminate, rounded or abruptly cuneate at the 

 base, sharply often doubly serrate, with straight glandular teeth, 

 and divided usually only above the middle into 4 or 5 pairs of small 

 acuminate lobes; less than half-grown when the flowers open about 

 the 20th of May and then thin, dark yellow-green and furnished above 

 along the midribs and veins with occasional white hairs, and at matur- 

 ity thin, dark blue-green and scabrate on the upper surface, pale 

 bluish green on the lower surface, 3.5-4.5 cm. long and 3-3.5 cm. wide, 

 with thin midribs and primary veins ; petioles slender, wing-margined 

 at the apex, glandular, with minute often persistent glands, 1.5-2.5 

 cm. in length; leaves on vigorous shoots ovate, more coarsely serrate, 

 more deeply lobed and often 6-7 cm. long and broad. Flowers 1-1.3 

 cm. in diameter, on short slender pedicels, in small compact mostly 

 5- or 6-flowered corymbs, the lower peduncles from the axils of upper 

 leaves; calyx-tube narrowly obconic, the lobes gradually narrowed 

 from wide bases, short, slender, acuminate, entire or occasionally 

 minutely glandular-dentate near the middle, reflexed after anthesis; 

 stamens 18-20; anthers dark rose color; styles 3-5, surrounded at the 

 base by a broad ring of pale hairs. Fruit ripening and falling early 

 in October, subglobose to ovoid-globose, full and rounded at the apex, 

 flattened at the base, pentagonal, russet green to dark purplish red, 

 pruinose, becoming lustrous, 1-1.3 cm. in diameter; calyx prominent, 

 with a short tube, a broad deep cavity tomentose in the bottom, and 

 spreading lobes; flesh light yellow-green, thin, juicy, acid; nutlets 

 usually 4, narrowed at the ends, rounded and slightly grooved on the 

 back, 6-6.5 mm. long and about 4 mm. wide. 



A shrub 3-4 m. high, with stems 1.5-1.8 cm. in diameter, covered 

 with dark scaly bark, ascending and spreading branches, and slender 

 nearly straight dark chestnut brown lustrous branchlets armed with 

 very slender straight purple shining spines 2.5-3 cm. long and per- 

 sistent and much-branched on old stems. 



Ravines, Schenley Park, Pittsburg, Allegheny County, O. E. and 



