122 ROCHESTER ACADEMY OF SCIENCE. 



A shrub 2-4 m. in height with slender much-branched stems 

 covered with pale gray very smooth bark and thin slightly zigzag 

 branchlets more or less deeply tinged with red, when they first appear 

 light red-brown, very lustrous, and marked by numerous minute pale 

 lenticels at the end of their first season, becoming reddish gray the 

 following year and armed with many stout much curved bright red- 

 brown shining spines 3-4 cm, in length. Flowers at the end of May. 

 Fruit ripens the middle of September. 



Rochester ; river Banks, Oak Hill, Genesee Valley Park, John 

 Dunbar, May 31, 1900, May, 1901, September, 1902 ; Buffalo, John 

 Dimbar, October, 1902. 



Crataegus tenuiloba, n. sp. 



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

 the young leaves. Leaves broadly ovate, acuminate, rounded, trun- 

 cate or cuneate at the entire base, sharply doubly serrate above, with 

 slender gland-tipped teeth and deeply divided into numerous acuminate 

 spreading lateral lobes ; about half-grown when the flowers open and 

 then very thin, light yellow-green and covered on the upper surface 

 with short white hairs ; at maturity thin but firm in texture, dark 

 bluish green, pale and glaucous below, 4-5 cm. long, 3-4 cm. wide, 

 with slender yellow midribs and 3 or 4 pairs of primary veins ; 

 petioles slender, grooved, occasionally glandular with minute dark 

 scattered glands, 1.5-2.5 cm. in length ; on vigorous leading shoots 

 leaves much thicker and more deeply lobed than the leaves of fertile 

 branchlets, often cordate at the base, 6-7 cm. long and usually as 

 wide, with short stout conspicuously glandular petioles wing-margined 

 to below the middle and frequently rose-colored in the autumn. 

 Flowers 1.5 cm. in diameter on long slender pedicels, in narrow few, 

 usually 4-6-flowered thin-branched compound corymbs ; calyx narrowly 

 obconic, the lobes elongated, very slender, acuminate, entire or very 

 slightly serrate, tipped with minute dark glands, reflexed after anthesis ; 

 stamens 10 ; anthers dark rose color ; styles 2-4. Fruit on slender 

 reddish pedicels, in drooping few-fruited clusters, oblong-obovate, full 

 and rounded at the apex, gradually narrowed to the base, scarlet', 

 lustrous, 1. 2-1.4 cm. long, i cm. wide ; calyx sessile, with a narrow 

 shallow cavity and enlarged erect and incurved lobes usually persistent 

 on the ripe fruit ; flesh thin, yellow, dry and mealy ; nutlets usually 

 2 or 3 thick, acute at the ends, prominently ridged on the back, with a 

 broad rounded deeply grooved ridge, about 7 mm. long. 



