ROSACE. SILVA OF NORTH AMERICA. 145 
CRATAIGUS INTEGRILOBA. 
Red Haw. 
STAMENS 10; anthers pink ; calyx-lobes entire. Leaves broadly obovate to oval or 
rhomboidal, dark green, and lustrous. 
Cratzegus integriloba, Sargent, Rhodora, iii. 78 (1901). 
A tree, occasionally eighteen or twenty feet in height, with a straight erect stem six or eight inches 
in diameter, and wide-spreading or erect branches forming an open irregular head. The branchlets are 
stout, nearly straight or occasionally slightly zigzag, marked by small scattered pale lenticels, and armed 
with stout nearly straight bright chestnut-brown lustrous spines from an inch and a half to two inches 
and a half in length and often pointed toward the base of the branch; dark orange-green and glabrous 
when they first appear, the branchlets become very lustrous and red-brown or orange-brown during their 
first summer, and ultimately dull ashy gray. The leaves are broadly obovate, oval or rhomboidal, acute 
at the apex, gradually or abruptly narrowed and cuneate below the middle, entire toward the base, 
coarsely doubly serrate above, with spreading glandular teeth, and irregularly divided into numerous 
short acute or acuminate lobes; in early spring they are coated with soft pale caducous hairs, and in 
the autumn they are glabrous, thin but firm in texture, dark green and lustrous on the upper surface, 
pale yellow-green on the lower surface, from an inch and a half to three inches long and from an inch 
and a quarter to two inches wide, with slender midribs often dark red at the base, and with from four 
to six pairs of slender primary veins deeply impressed on the upper side; they are borne on stout 
grooved petioles more or less broadly winged toward the apex, puberulous at first but soon glabrous, 
often red on the lower side, and from one third to three quarters of an inch in length. The stipules 
are linear, finely glandular-serrate, villose, light red, from three quarters of an inch to an inch long, 
and caducous. The flowers open during the first week in June, when the leaves are nearly fully grown, 
and are three quarters of an inch in diameter; they are produced in broad open many-flowered com- 
pound thin-branched villose corymbs, with linear glandular-serrate caducous bracts and bractlets. The 
calyx-tube is broadly obconic, coated toward the base with long matted white hairs and glabrous above, 
and the lobes are linear-lanceolate, elongated, entire, or very rarely furnished with an occasional 
caducous gland. There are ten stamens with stout slender filaments and large rose-colored anthers, 
and two or three styles surrounded at the base by a narrow ring of soft white hairs. The fruit ripens 
at the end of September or early in October and is borne on short stout pedicels, in drooping or erect 
many-fruited slightly villose clusters; it is subglobose, bright scarlet, lustrous, rarely marked by large 
pale dots, and from one third to one half of an inch in diameter; the calyx is prominent, with a 
comparatively broad deep cavity and elongated entire lobes which are dark red on the upper side at 
the base, much reflexed and persistent ; the flesh is thin, yellow, sweet, and pulpy. The two or three 
nutlets are thick and broad, prominently and often doubly ridged on the back, penetrated on each of 
the inner faces by a broad deep longitudinal groove, and about a quarter of an inch long. 
Crategus integriloba grows on low limestone ridges in the region south of the St. Lawrence River 
near the Lachine Rapids, where it was discovered at Beauharnois in August, 1899, by Mr. J. G. Jack, 
who has found it also at Caughnawaga, Rockfield, and Adirondack Junction. 
