KEY TO THE CRATAEGUS 175 



E. Leaves widest near the middle ; stamens 8-12 ; fruit globular 

 (I inch), crimson, ripening near end of Sept. and remaining on 

 for several weeks on erect slender stems ; thorns slender, long, 

 2-4 inches. Long-thorned Haw (265) — Crataegus macra- 

 cS.ntha. 

 D. Leaves thin, only half as wide as long, and widest near the 

 center ; flowers ^ inch wide ; stamens 20 with rose-colored an- 

 thers ; fruit oval or pear-shaped, J inch long, dull red, with 2-3- 

 stones ; spines slender, straight (1-2 inches). Pear Haw — 

 Crataegus Chapm^ni Plukenfetii. (C. tomentosa of the Linnean 

 herbarium.) 



* Leaves deciduous, narrow and unnotched at base, somewhat wedge- 



shaped, notched at end, and sometimes somewhat 3-lobed at tip. 



(P-) 

 F. Tall shrubs or small trees occasionally 30 feet high with many- 

 flowered clusters. (G.) 

 G. Leaves wedge-shaped, usually thick, dark green and shining 

 above (1-4 inches long); fruit globose (J inch long) with 

 greenish dry and mealy flesh and usually 2 stones, ripening in 

 Oct. and lasting through the winter ; stamens 10 with rose- 

 colored anthers. Cockspur Thorn — Crataegus Crus-gdlli. 

 G. Leaves obovate, sometimes slightly lobed beyond the middle, 

 2-3 inches long ; fruit red or yellow with white dots, oblong 

 (I inch), on stout, drooping stems, ripening and falling in Oct.; 

 stamens 20 with rose-colored, or yellow, anthers. Large- 

 fruited Thorn (266) — Crataegus punctiita. 

 G. Leaves spatulate or oblanceolate, often 3-lobed at the end, 

 1-2 inches long; fruit globose, small, ^ inch, ripening in Oct.; 

 stamens 20 with rose-colored anthers. Small-froited Thorn 

 — Crataegus spathuia,ta. 

 F. Small shrub 3-10 feet high ; flowers visually solitary, 1 inch broad ; 

 leaves f-lf inches long ; thorns numerous, J-2 inches long ; fruit 

 globose, yellow, J' inch. One-flowered Thorn — Crataegus uni- 

 fl6ra (C. tomentosa of the Linnean description). 



* Leaves evergreen, small, J-lf inches long, narrow with crenulated 



edges ; flowers white, small, in clusters, stamens about 20 with yel- 

 low anthers ; fruit small, J inch, bright red (rarely yellow or 

 white), remaining on through the A\'inter ; twigs ending in many 

 sharp thorns. Usually small shrubs rarely 10 feet high ; hardy to 

 Massachusetts if somewhat protected, genus Pyraointha, often 

 called Crataegus. (H.) 

 H. Young- twigs grayish-pubescent; leaves lanceolate, f-]J inches 

 long ; fruit bright red, orange, or white. Evergreen Thorn 



