98 ROCHESTER ACADEMY OF SCIENCE. 



and slightly "grooved or irregularly ridged on the back, 6-7 mm, long. 



A shrub 5 or 6 m. in height with numerous stems covered with 

 dark gray bark, spreading into broad thickets, erect branches, and 

 stout only slightly zigzag branchlets, dark orange-green tinged with red 

 and marked by numerous small pale lenticels when they first appear, 

 bright red-brown and very lustrous at the end of their first season, 

 becoming light gray-brown the following year, and armed with many 

 stout nearly straight bright red-brown shining spines 3.5-4.5 cm. long. 

 Flowers from the 20th to the end of May. Fruit ripens at the end of 

 September. In the autumn the leaves turn to a handsome lemon 

 yellow. 



Rochester, Highland Avenue, Beckwith farm. Float Bridge, 

 Genesee Valley Park, C. S. Sargent^ John Dimbar, September 19, 

 1900, and September, 1902, John Dunbar, May, September and 

 October, 1901, on left side of Scottsville road at creek near Pennsyl- 

 vania R. R. Round House ; Greece, M. S. Baxter, May, 1902. 



Crataegus Lennoniana, n. sp. 



Glabrous with the exception of a few hairs on the young leaves 

 and their petioles. Leaves ovate to rhombic, acuminate, gradually 

 narrowed and concave-cuneate at the entire base, deeply serrate 

 above, with blunt gland-tipped teeth, and usually divided into 4 or 5 

 pairs of short broad acuminate lateral lobes ; nearly half-grown when 

 the flowers open and then membranaceous, light yellow-green and 

 furnished with a few soft pale hairs on the upper surface particularly 

 toward the base of the midribs ; at maturity thin, dark dull yellow- 

 green and slightly roughened above, pale and glabrous below, 

 4-5 cm. long, 3-5 cm. wide, with stout orange-colored midribs 

 and 4 or 5 pairs of primary veins arching obliquely to the 

 points of the lobes ; petioles slender, narrowly wing-margined at 

 the apex by the decurrent base of the leaf-blades, slightly hairy 

 toward the apex while young, soon glabrous, 1.5-4 <^"i- i" length ; 

 stipules linear, acuminate, glandular, mostly deciduous before the 

 flowers open ; on vigorous shoots leaves broadly ovate, subcoriaceous, 

 deeply lobed, truncate of slightly cordate at the base, 5-6 cm, long 

 and usually as wide or wider than long, with stout winged glandular 

 petioles usually about 2 cm. in length. Flowers 1.2 cm. in diameter 

 on short slender pedicels, in compact many-flowered thin-branched 

 compound corymbs ; calyx-tube narrowly obconic, the lobes abruptly 

 narrowed from broad bases, slender, acuminate, entire, occasionally 



