ROSACEiE 



457 



form; calyx enlarged, prominent, with a broad deep cavity and nearly entire wide- 

 spreading lobes; flesh yellow, thin, dry and hard; nutlets 5, broad and thick, nar- 

 rower and rounded at the ends, obscurely and unequally grooved on the back, about 



T long- 



A tree, rarely more than 15-20 high, with a well-developed trunk 5'-6' in diam- 

 eter, stout spreading branches forming a broad low flat-topped head, and branch- 

 lets armed with thick straight or slightly curved bright chestnut-brown shining spines 

 l'-2' in length. 



Distribution. Low limestone ridges opposite Lachine near the south bank of the 

 St. Lawrence River and on the Island of Montreal, Province of Quebec. 



88. Crataegus Hudsonica, Sarg., n. sp. 



Leaves ovate or slightly obovate, acute, gradually and abruptly narrowed and 

 mostly concave-cuneate at the entire base, sharply and often doubly serrate above, 

 with straight or incurved glandular teeth, and frequently slightly divided above the 

 middle into short acute lobes, nearly fully grown when the flowers open at the end of 

 May, and then thin, light yellow-green, smooth and glabrous above with the excep- 

 tion of a few short white scattered hairs along the midribs, and pale and glabrous 

 below, and at maturity thin but firm in texture, glabrous, 2'-2i' long, li'-l|' wide, 

 with slender yellow midribs and o or 6 pairs of thin primary veins extending obliquely 

 to the points of the lobes; their petioles slender, wing-margined above, glandular, 



at first slightly hairy, becoming glabrous and rose color toward the base, f'-l' long; 

 on vigorous shoots broadly ovate to suborbicular, full and rounded or broadly cuneate 

 at the wide base, deeply divided into broad lateral lobes, and 2'-3' long and broad. 

 Flowers about f in diameter, on long slender pedicels, in broad usually 10-12-flow- 

 ered compound glabrous corymbs; calyx-tube narrowly obconic, glabrous, the lobes 

 gradually narrowed from broad bases, acuminate, glandular-serrate often only below 

 the middle, glabrous on the outer, slightly hairy on the inner surface; stamens 20; 

 anthers rose color; styles 3-5. Fruit ripening early in September, in few-fruited 

 drooping clusters, subglobose, crimson, pruinose, marked by numerous pale dots, 

 about I' in diameter; calyx enlarged, with a deep broad cavity, and closely appressed 

 serrate lobes villose on the upper side; flesh thick, yellow, dry and mealy; nutlets 



