1910.] NATURAL SCIENCES OF PHILADELPHIA. 209 



Lobes of the leaves in 4 or 5 pairs. 



Lobes of the leaves narrow, long-pointed. .3. C. glaueophylla. 



Lobes of the leaves short, acuminate 4. C. insolita. 



Lobes of the leaves in 6 or 7 pail's, small and spreading. 



5. C. flammata. 

 Corymbs 4- or 5-flowered; lobes of the leaves long, narrow, 



spreading or recurved 6. C. siderea. 



Calyx cavity of the fruit wide and shallow. 

 Leaves smooth. 



Lobes of the leaves long, spreading, often recurved; fruit 



obovate, becoming oval when fully ripe 7. C. rafipes. 



Lobes of the leaves small and spreading; fruit short -oblong ; 



leaves blue-green 8. C. antheina. 



Lobes of the leaves narrow, acuminate, usually pointing 

 toward the apex of the leaf; fruit short-oblong. 



9. C. propensa. 

 Leaves scabrate on the upper surface; fruit pruinose. 



10. C. Heidelbergensis. 



1. Crataegus tenella Ashe. 



Ann. Carnegie Mus., I, pt. 3, 338 (1902); Sargent, Bot, Gazette, XXXV, 

 10S (The Genus Crataegus in Newcastle County, Delaware); Proc. Acad. 

 Nat. Sci. Phila., 1905,^608. 



Roadsides and fields between Stroudsburg and Tannersville, Monroe 

 County, B. H. Smith and C. S. Sargent, (Nos. 1, 3 and 6) May 22, 

 1908, B. H. Smith, September 19, 1908; near Scranton, Lackawanna 

 County, A. Twining, (No. 24) October 3, 1907, May 24, 190*8; Dunmore, 

 near Scranton, A. Twining, (No. 20) October 3, 1907, May 24, 1908; 

 valley of the Little Juniata River below Altoona, Blair County, B. H. 

 Smith, (No. 260) May 20, 1905; valley of the Conemaugh between 

 Wilmore and Portage, Blair County, B. H. Smith, (No. 271) May 21, 

 1905, May 17, 1906, B. H. Smith and C. S. Sargent, September 26, 1905, 

 (No. 274) B. H. Smith, May 21, 1905, B. H. Smith and C. S. Sargent, 

 September 26, 1905; near Wilmore, Blair County, B. H. Smith and 

 C. S. Sargent, (No. 274+) September 26, 1905, B. H. Smith, May 17, 

 1906; also eastern Pennsylvania and northern Delaware. 



No. 210 from near Kutztown resembles C. tenella in its fruit; the 

 leaves are somewhat thicker and darker green, and the flowers are 

 more cup-shaped. This plant grows on hillsides, while C. tenella in 

 this region is usually found only on low ground. 



2. Crataegus angustisepala n. sp. 



Glabrous with the exception of the hairs on the upper surface 

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

 and long-pointed at the apex, cuneate at the base, finely often doubly 

 14 



