112 WOODY PLANTS 



4. A. laevls Wieg. Smooth Serviceberry . A tree 13 m. high 

 or less; leaves sparingly pubescent or glabrous in the bud; buds 

 0.9-1.7 cm. long. Thickets, Newfoundland to Ontario, south to 

 Iowa and Illinois and in the mountains to Georgia (Fig. 140 ). 



5. A. bartramiana (Tausch) Roemer. Glade Serviceberry. 

 (A. oligocarpa (Michx. ) Roemer )t A shrub 0. 5-2. 5 m. high, the 

 stems several together, loosely caespitose-fastigiate; leaves im- 

 bricate in the bud. Bogs and moist slopes, Labrador to Ontario 

 and Minnesota, south in the mountains to West Virginia (Fig. 141). 



CRATAEGUS L.*Hawthorns. Red Haws (Rosaceae) 



Deciduous shrubs or trees, usually with well-developed twig- 

 spines. Twigs moderate or rather slender, terete, pith rather 

 small, continuous, round. Buds solitary or collaterally branched, 

 sessile, round or oblong-ovoid, with about 6 exposed scales. Leaf- 

 scars alternate, narrowly crescent-shaped; bundle-traces 3; 

 stipule-scars small. 



Crataegus is a large and exceptionally complicated genu3, with 

 more than 100 species recognized from the range of this manual. 

 The plants, however, are very hard to identify, even from materi- 

 al having leaves, flowers, and fruit, and it is a hopeless task to 

 attempt to construct a key to distinguish them in the winter state. 

 In the present treatment, nevertheless, an effort has been made 

 to provide winter characters for the different groups (Series) of 

 the region. Even this has proved very difficult and the following 

 key must be regarded as quite provisional. 



a. Slender shrubs .8-1. 5 m. tall with few simple or 

 little-branched stems. 



Series 2. Parvifoliae (C. uni flora 

 Muench. ) 



a. Arborescent shrubs or trees with stout boles or 

 bifurcating branches. 



b. Usually shrubby but sometimes becoming 

 small trees under favorable conditions. 



c. Branches mostly ascending forming a 

 narrow crown;thorns numerous, long 

 and stout. 



Series 14. Macracanthae. (C. 

 succulenta .Link) 

 c. Lower branches spreading, form- 

 ing rounded crowns usually as 



* 



Based on data furnished by Ernest J. Palmer 



