452 



The Thorn Trees 



the bark is dark gray, scaly; the young twigs are covered with matted white hairs 



but become smooth with age and are 

 armed occasionally with slender red- 

 brown spines. 



The leaves are oblanceolate- 

 obovate, 2 to 6 cm. long, i to 4 cm. 

 wide, pointed or short-pointed at 

 the apex, strongly wedge-shaped at 

 the base, finely toothed, rough hairy 

 and shining above, pale and hairy 

 below, particularly along the slender 

 midrib and veins, dark green, half 

 leathery; leaf-stalks densely woolly- 

 hairy, becoming smoother, winged 

 above, about i cm. long. The 

 Fig. 395.-Barbern'-leaved Haw. flowers are about 1 5 mm. wide in 



long-hairy, few-flowered cor}^mbs; calyx-tube long-hairy, the lanceolate long- 

 pointed lobes slightly hairy, remotely toothed; stamens about 20; anthers yellow; 

 styles 2 to 3. The fruit ripens late in October; it is subglobose, about 10 mm. 

 thick, orange and red, slightly hairy, calyx- lobes spreading; flesh thin, yellow; it 

 contains 2 to 3 nutlets strongly ridged on the back, the nest of nutlets about 6 

 mm. long and 6 mm. thick. 



7. PHILADELPHIA THORN Crataegus pausiaca Ashe 



Eastern Pennsylvania is the home of this species. It is a tree from 6 to 8 

 meters high, with spreading branches forming a flat or round crown; the bark is 

 dark brown, scaly; the young twigs 

 are orange-green, becoming gray, 

 and bear numerous stout, curved, 

 light brown spines from 4 to 6 cm. 

 long; the trunk sometimes has 

 branched spines 3 dm. long. 



The leaves are oblanceolate- 

 obovate, 3 to 6 cm. long, 1.5 to 4 

 cm. wide, sharp-pointed to rounded 

 at the apex, wedge-shaped at the 

 base, doubly toothed above, dark 

 yellow-green with impressed veins 

 on the upper surface, paler be- 



neath, slightly hairy when young, ^^^_ ^^^_ _ p,,^,^jp,j^ ^horn. 



becommg smooth except on the 

 veins beneath, thin; leaf-stalks wing-margined, i to 2 cm. long. The flowers are 



