476 



The Thorn Trees 



stalks slightly long-hairy, glandular, winged above, about 15 nun. long. The 



flowers are about 15 mm. broad, 

 in somewhat long-haiiy, many- 

 flowered corymbs; calyx-tube 

 nearly smooth; calyx-lobes trian- 

 gular, long-pointed, smooth on the 

 outside, slightly long-hairy on the 

 inside, remotely glandular-toothed, 

 red-tipped; stamens about 10; 

 styles 3 or 4. The fruit, ripening 

 in September, is pear-shaped or 

 oblong, 8 to 12 mm. long, scarlet, 

 its calyx-lobes spreading, persist- 

 ent; the flesh is pulpy when ripe; 

 it contains 3 or 4 nutlets 6 to 8 

 Fig. 432.-HoweU's Thorn. ^^ i^^g, 6 to 7 mm. thick, 



strongly ridged on the back, with a shallow pit on each inner surface. 



43. ST. LAWRENCE THORN — Crataegus laurentiana Sargent 



This thom grows along the lower St. Lawrence River, and from northern 

 Michigan to British Columbia, eastern Oregon and central Colorado. It is a 

 many-branched shrub or a small tree 

 sometimes 5 meters high, with ir- 

 regular branches; the twigs are 

 sUghtly hairy, soon becoming smooth, 

 bright orange-brown, and bear stout 

 chestnut-brown spines from 3 to 8 

 cm. long. 



The leaves are oblong to oblong- 

 ovate^ sharply or bluntly pointed at 

 the apex, strongly wedge-shaped at 

 the base, sharply and doubly toothed, 

 with three to five pairs of pointed 



Fig. 433. — St. Lawrence Thorn. 



lobes, 3 to 8 cm. long, 1.5 to 4 cm. broad, slightly hairy, particularly along the 

 veins when young, becoming smooth, except along the veins beneath, half- 

 leathery, dark green above, paler beneath; leaf -stalks slightly winged toward the 

 apex, hairy, becoming smooth, 1 to 2 cm. long. The flowers are about 15 mm. 

 broad, in many-flowered, whitish woolly-hairy corymbs; calyx-tube densely white 

 woolly-hairy, the lanceolate, long-pointed lobes hairy or nearly smooth, glandular- 

 toothed; stamens about 10; anthers small, pale pink; styles 4 or 5. The fruit 

 ripens in September, is oblong, dark crimson, slightly hairy, about 10 mm. long, 

 its calyx-lobes reflexed, persistent; the flesh is yellow, becoming soft, succulent 



