Woolly Thorn 



471 



or crimson; the calyx-lobes are erect, hair\'; the flesh yellow, mealy, acid, con- 

 taining 4 or 5, commonly 5, nutlets 7 to 9 mm. long, the nest 8 to 10 mm. thick, 

 the backs of nutlets grooved, and with a deep sinus between them. 



This runs into many forms. Cratcegus suhmollis Sargent is a form with 10 sta- 

 mens and generally early ripening fruit, occurring in eastern Canada and New 

 England. Cratcegus champlainensis Sargent is a later fruiting form with 10 sta- 

 mens, with about the same range. 





CANADIAN THORN Crataegus canadensis Sargent 



CratcEgus canadensis is known to occur only on the limestone ridges along the 

 St. Lawrence river above Montreal at 

 Caughnawaga. It is a tree sometimes 

 9 meters high, with spreading branches, 

 forming a large rounded topped crown ; 

 twigs orange-brown, hairy when young, 

 becoming smooth, armed with numer- 

 ous curved, chestnut-brown spines from 

 3 to 7 cm. long. 



The leaves are broadly ovate to 

 oval, 3 to 8 cm. long, 3 to 8 cm. wide, 

 pointed at the apex, rounded or cut 

 square at the base, doubly toothed, 

 with sharp, erect teeth, slightly hairy 

 on the upper surface, becoming nearly ^^^- 425- Canadian Thorn, 



smooth, woolly-hair\% particularly along the veins, beneath, thin, blue-green; leaf- 

 stalks woolly-hairy, becoming nearly smooth, glandular, winged, 2 to 3 cm. long. 

 The flowers are about 15 mm. wide in many-flowered woolly-hair)' cor}'mbs; 

 calyx-tube and lanceolate long- pointed, glandular-toothed lobes woolly-hair}'; sta- 

 mens about 20; anthers small, yellow; styles 5. The fruit, which ripens in October, 

 is short-oblong to globose, about 15 mm. thick, scarlet, slightly hair}-, its calyx- 

 lobes spreading, prominent; flesh pale yellow, dry, mealy and acid; it contains 5 

 nutlets, 6 to 8 mm. long, grooved on the back, the nest about 8 to 9 mm. thick. 



36. WOOLLY THORN Crataegus lanuginosa Sargent 



This species occurs in southwestern Missouri, where it reaches a maximum 

 height of 8 meters, with spreading and erect branches; the twigs are densely woolly- 

 hairy at first, becoming smooth, and are armed with many straight chestnut-brown 

 spines from 3 to 9 cm. long; the thorns of the terminal shoots are leafy at first, 

 the leaves disappearing with age. 



The leaves are ovate to suborbicular, 2.5 to 7 cm. long, 2 to 6 cm. wide, 

 pointed at the apex, wedge-shaped or cut square at the base, coarsely doubly 



