Woolly Thorn 



471 



or crimson; the calyx-lobes are erect, hairy; 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. Cratagus champlainensis Sargent is- a later fruiting form with 10 sta- 

 mens, with about the same range. 



35. CANADIAN THORN — OratSBgus canadensis Sargent 



Cratagus 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 ^i^- 425- — Canadian Thorn, 



smooth, woolly-hairy, 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-hairy corymbs; 

 calyx-tube and lanceolate long-pointed, glandular-toothed lobes woolly-hairy; 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 hairy, its calyx- 

 lobes spredlding, 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 



