468 



The Thorn Trees 



usually with several pairs of spreading broad-pointed or pointed lobes, green, 



thin but firm, sHghtly hairy on the veins 

 beneath; leaf -stalks glandular, slightly 

 hairy, 2 to 3 cm. long. The flowers are 

 about 20 mm. wide in few-flowered, 

 smooth corymbs, the calyx-lobes ovate, 

 pointed, remotely glandular-toothed ; 

 stamens about 20; anthers pink; styles 

 3 to 5. The fruit ripens late ; it is sub- 

 globose, s-angled, about 20 mm. thick, 

 dark crimson; the calyx-lobes are erect, 

 conspicuous; flesh firm, tinged with red, 

 subacid; it contains 3 to 5 nutlets, 

 usually 5, 7 to 9 mm. long, grooved on 

 the back, the nest of nutlets 9 to 11 

 mm. thick with a deep sinus between 

 the nutlets. 



Fig. 420. — Eggert's Thom. 



Cratmgus dilatata Sargent is an eastern form, with bright red fruit and larger 

 corymbs. 



31. PRINGLE'S THORN - Crataegus Pringlei Sargent 



Pringle's thorn grows from western New England southward to Pennsylvania 

 and westward to southern Ontario, Michigan, and northern Illinois. It is a tree 

 sometimes 8 meters high, with ascending branches forming a broad roimd-topped 

 crown; the bark is thin, scaly and red-brown; the twigs are chestnut-brown, hairy, 

 becoming gray and smooth, the curved chestnut-brown spines from 3 to 5 cm. long. 



The leaves are ovate-oval, 3 to 9 cm. long, 2.5 to 8 cm. wide, broadly pointed 

 at the apex, rounded or abruptly wedge- 

 shaped at the base, doubly toothed, the 

 terminal leaves often with several pairs 

 of bro^-pointed or pointed lobes, bronze- 

 green and hairy when young, becoming 

 bright yellow-green and smooth above, 

 paler beneath, hairy along the veins, be- 

 coming nearly smooth, thin; leaf-stalks 

 hairy, glandular, i to 3 cm. long. The 

 flowers are about 2 cm. wide, in many- 

 flowered, hairy (sometimes nearly smooth) 

 corymbs ; calyx-tube slightly hairy, the lan- 

 ceolate long-pointed lobes nearly smooth, 

 glandular- toothed ; stamens 5 to 20; an- 



, . , , , rr.1. r -A. • Fig. 421. — Pringle's Thom. 



thers pmk; styles 3 to 5. The fruit npens 



about the first of October; it is short-oblong, about 15 mm. thick, red and hairy; 



