(448) 
CraTaEcus PorTERI, n. sp. 
A glabrous shrub. Leaves ovate, dark green and shining 
above, paler beneath, 6-10 cm. long, 3-5 cm. wide, sharply 
irregularly serrate and slightly lobed, the base narrowed or 
cuneate, the apex acute, the slender petiole about one-third the 
length of the blade; pedicels slender; fruit pyriform, about 
1.4 cm. long and I cm. in diameter, pruinose; calyx-lobes 
entire. 
Type collected by myself at Tannersville, Monroe Co., 
Penn., July 4, 1896, in company with Prof. Thos. C. Porter 
of Lafayette College, and preserved in the herbarium of 
Columbia University. 
The species differs from C. prauznosa (Wendl.) Beadle 
(Mespilus pruinosa Wendl.), in its pyriform, not globose 
pomes, and thicker firm and shining leaves. 
CRATAEGUS OCCIDENTALIS n. sp. 
A shrub or small tree, sometimes 6-7 m. high. Thorns 
slender, about 3 cm. long; pedicels and calyx pubescent; 
leaves oval or slightly obovate, irregularly serrate and some- 
times slightly lobed, mostly obtuse at the apex, and narrowed 
or subcuneate at the base, 4-7 cm. long, 3 or 4 cm. wide, 
slender-petioled, pubescent beneath, at least on the veins; 
corymbs several-flowered; flowers about 1.5 cm. wide; fruit 
oval-globose, about r cm. long. 
Types in herbarium of Columbia University collected by 
Prof. E. L. Greene, near Golden, Colo., 1873, along streams, 
in flower; on river-bank near the Forks of Dismal River, 
Hooke Co., Nebr., collected by Dr. P. A. Rydberg, July 11, 
1893, in fruit. The species is, perhaps, nearest related to 
C. tomentosa L. Also collected by Mr. R. S. Williams at 
Columbia Falls, Mont., May 19, 1897 (Herb. N. Y. Bot. 
Garden). 
CRATAEGUS TENUIFOLIA Nn. sp. 
A shrub, the thorns slender, slightly curved, 5—6 cm. long. 
Leaves very thin, even when mature, ovate, acute or short- 
acuminate at the apex, narrowed, or some of them subtruncate 
at the base, incised-serrate and lobed, 6-10 cm. long, with 
short hairs on the upper surface, the very slender petiole half 
