194 JOURNAL OF THE ARNOLD ARBORETUM [vol. in 



the leaves of that species are all acutely cuneate at base, thicker and 

 lustrous on the upper surface, the flowers are larger in usually fewer- 

 flowered corymbs, and the fruit is less gradually narrowed to the base 

 with a narrow cavity pointed in the bottom, and droops on more slender 

 pedicels. C. Porteri as it grew in 1908 in the woods in low undrained soil 

 in the neighborhood of Tannerville was a slender shrub about 5 m. high. 



Crataegus ellipticifolia (§ Pruinosae), n. sp. 



Leaves elliptic, acute at the ends, divided above the middle into short 

 acute lobes, and finely often deeply serrate often to below the middle with 

 acute glandular teeth; covered above when they unfold with short white 

 hairs, becoming glabrous, and at maturity thin, smooth and yellow-green on 

 the upper surface, paler below, 4-5 cm. long and 2.5-3.5 cm. wide, with a 

 slender midrib and primary veins; petioles slender, glabrous, 2-3 cm. in 

 length; leaves on vigorous shoots often broad-ovate, rounded or truncate 

 at base, occasionally deeply lobed, more coarsely serrate, 4-6 cm. long 

 and 4-5 cm. wide. Flowers opening late in May, 1-1.2 cm. in diameter, 

 on long slender pedicels, in mostly 7-9-flowered slightly villose corymbs 

 with long slender conspicuous bracts and bracllets; calyx-tube narrow- 

 obconic, glabrous, the lobes gradually narrowed from a broad base, 

 slender, acuminate, entire or rarely furnished with an occasional tooth, 

 glabrous; stamens 20; anthers small, creamy white; styles 5. Fruit ripening 

 early in October, short-oblong to subglobose, only slightly angled, hard, 

 turning dull red at maturity, about 1 cm. in diameter, the calyx only slight- 

 ly enlarged with a short tube, spreading closely appressed lobes, and a deep 

 narrow cavity rounded in the bottom; nutlets broad and rounded at base, 

 narrower and often acute at apex, prominently ridged on the back with 

 a deeply grooved ridge, 5-0 mm. long and 3.5-4.5 mm. wide, the narrow- 

 pale hypostyle extending to below the middle. 



A shrub forming thickets with slender slightly zigzag glabrous branch- 

 lets, yellowish green early in their first season, becoming light red-brown, 

 and armed with slender nearly straight chestnut-brown spines persistent 

 and often compound on old stems. 



Ohio. Delaware County, in pastures, near Delaware, E. R. Horsey, 

 No. 123, September 25, 1913, No. 231 (type), May 27 and September 25, 1914. 



From other Pruinosae with leaves covered above w T hile young witli 

 short white hairs, flowers with 20 stamens and white or yellow anthers this 

 species differs in its elliptic leaves. 



Crataegus mariettensis (§ Pruinosae), n. sp. 



Leaves oblong-ovate, acuminate, rounded or truncate at base, slightly 

 divided into three or four pairs of short broad acute lobes, and coarsely 

 doubly serrate with straight glandular teeth; tinged with red and covered 

 above by white hairs when they unfold, nearly glabrous when the flowers 

 open, and at maturity thin, yellow-green, smooth and glabrous above, 



