ROSACES 



459 



often doubly serrate with straight or incurved teeth tipped with small dark glands, nearly 

 fully grown and very thin when the flowers open at the end of May, and at maturity mem- 

 branaceous, dark green and roughened above by short rigid pale hairs, pale and glabrous 

 below, 2'-2|' long, and \\'-%! wide, with a slender yellow midrib, and thin primary veins ex- 

 tending to the point of the lobes; petioles slender, often winged toward the apex, glandular 

 with minute dark glands, usually about 1' in length; leaves at the end of vigorous shoots 

 more deeply lobed, and often 4' long and 3' wide. Flowers | ;'-f ' in diameter, on long slender 

 pedicels, in compact few-flowered glabrous corymbs; calyx-tube narrowly obconic, gla- 

 brous, dark red, the lobes linear-lanceolate, entire or finely glandular-serrate; stamens 

 usually 5, occasionally 6-10; anthers large, dark red-purple; styles 3, surrounded at base 

 by a thin ring of hoary tomentum. Fruit ripening about the middle of September and soon 

 falling, on stout pedicels, in drooping narrow clusters, short-oblong, full and rounded at the 

 ends, dark crimson, lustrous, marked by minute pale dots, usually about f long and \' 

 in diameter; calyx enlarged and persistent, the lobes elongated, strongly incurved, often 



deciduous before the fruit ripens; flesh thick, dry and mealy; nutlets 3, narrowed and acute 

 at the ends, prominently ridged on the back with a high broad ridge, \' long. 



A tree, rarely more than 15 high, with a straight trunk 5'-6' in diameter, covered with 

 thin bark separating into papery lustrous pale scales, stout branches forming a broad open 

 irregular head, and slender glabrous branchlets bright chestnut-brown during their first 

 season, becoming ashy gray the following year, and armed with many thick straight or 

 curved bright chestnut-brown or red-brown spines I'-l^' long. 



Distribution. Low hills and limestone ridges; western and southern Vermont; southern 

 Connecticut (rocky shore of Alewive Creek, Waterford, New London County), and east- 

 ern and central New York (Whitesboro, Oneida County). 



64. Crataegus lucorum Sarg. 



Leaves broad-ovate to obovate or rarely oval, broad-cuneate or rounded at the entire 

 base, coarsely serrate above with straight teeth tipped with large persistent bright red 

 glands, and deeply divided above the middle into 3 or 4 pairs of wide acute or acuminate 

 lobes, rather more than a third grown when the flowers open early in May and then light 

 yellow-bronze color, covered on the upper surface with short soft pale hairs and glabrous 

 on the lower surface, and at maturity membranaceous, smooth, dark dull green and gla- 

 brous above, pale yellow-green below, about 2' long and \\' wide, with a slender yellow 

 midrib, and 3 or 4 pairs of thin primary veins extending obliquely to the point of the lobes ; 



