1910.] NATURAL SCIENCES OF PHILADELPHIA. 191 



season and dark red-brown the following year, and armed with numer- 

 ous stout slightly curved purple shining spines 4-4.5 cm. long. 



Between Carnot and Stoops Ferry, Allegheny County, 0. E. Jen- 

 nings, (No. 73 type) May 20, 1907, 0. E. and Grace K. Jennings and 

 B. H. Smith, October 6, 1907. 



2. Crataegus felix Sargent. 



Proc. Acad. Nat. Sci. Phila., 1905, 589. 



Corrected Characters of the Flowers. — Leaves less than one-half grown 

 when the flowers open about the 10th of May and then very thin, 

 yellow-green and roughened above by short white hairs. Flowers 

 1.5-1.9 cm. in diameter, on very short slender glabrous pedicels, in 

 small compact 6-12-flowered corymbs, the lower peduncles from the 

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

 narrowed from wide bases, long, slender, acuminate, minutely gland- 

 ular-dentate above the middle or entire, slightly hairy on the inner 

 surface, reflexed after anthesis; stamens 5-10; anthers dark rose color; 

 styles 3 or 4, surrounded at the base by a broad ring of pale tomentum. 



Through an error caused by the mixing of specimens of two plants 

 growing close together the flowers of Crataegus felix were originally 

 described as with 18-20 stamens and pale rose-colored anthers, and 

 this species was placed among the Pruinosae. 



3. Crataegus stolonifera Sargent. 



Bot. Gazette, XXXV, 109 (The Genus Crataegus in Xew Castle County, 

 Delaware) (1903); Proc. Acad. Nat. Sci. Phila., 1905, 623; No. IV, 

 Ontario Nat. Sci. Bull., 38. 



Valley of the Little Juniata River below Altoona, Blair County, 

 B. H. Smith, (No. 262) May 20, 1905, B. H. Smith and C. S. Sargent, 

 September 27, 1905; also in northern Delaware, eastern Pennsylvania 

 and southern Michigan. 



4. Crataegus ambigens n. sp. 



Glabrous with the exception of the hairs on the upper surface of 

 the young leaves and on the calyx-lobes. Leaves broadly ovate, 

 acute or acuminate, abruptly cuneate or rounded at the wide base, 

 finely often doubly serrate, with short straight or incurved glandular 

 teeth, and slightly divided into 3 or 4 pairs of short broad lateral 

 lobes; about one-third grown when the flowers open at the end of 

 May and then thin, yellow-green and slightly roughened above by 

 short white hairs and paler below, and at maturity thick, dark yellow- 

 green, smooth and lustrous on the upper surface, pale bluish green on 

 the lower surface, 3-4 cm. long and 3-3.5 cm. wide, with thin promi- 

 nent midribs and primary veins ; petioles slender, glandular early in the 



