ROSACEAE. 



Ill 



Crataegus. Haw. Red Haw. 

 (Family Rosaceae). 



Shrubs or trees, usually with 

 well-developed twig-spines : decidu- 

 ous. Twigs moderate or rather 

 slender, terete: pith rather small, 

 continuous, roundish. Buds soli- 

 tary or collaterally branched in 

 spine formation, sessile, round or 

 oblong-ovoid, with some half-dozen 

 exposed fleshy and often bright 

 red scales. Leaf-scars alternate, 

 narrowly crescent-shaped, some- 

 what raised: bundle-traces 3: 

 stipule-scars small. 



A complex aggregate of minor 

 species incapable as yet of delimi- 

 tation in winter even if they may 

 be known when found with foli- 

 age, flowers and fruit: though 

 the pointed habit of growth of C. 

 Phaenopyrum (the Washington 

 Thorn), the open round-headed 

 form of C. mollis (the common Red-Haw of the prairie re* 

 gion, 1) and its thornless variety inermis, 2, the stratified 

 branching of C. Crus-galli (the Cockspur Thorn, 3) and C. 

 punctata, and the ash-gray outer bark, flaking from the buff- 

 orange inner layers of C. viridis (the River Haw, 4) joined 

 to the obvious bud-differences figured, suggest that the task 

 of segregating the more commonly cultivated forms in winter 

 may be less hopeless than it appears at first sight. The 

 European Hawthorns of the gardens are in part C. oxyacan- 

 tha and in part the very similar C. monogyna, 5. Winter- 

 character references under Purshia. 



