108 WOODY PLANTS 



ovoid, solitary, with several exposed scales; inflorescence 

 corymbose. Rocky banks, in the mountains. New Jersey south 

 to Georgia and Kentucky (Fig. 129). 



6. S. virginiana Britt. Virginia Spiraea . Stem much-branched, 

 to 1,2 m. high; twigs often glaucous, glabrous or pubescent, 



more or less angled, inflorescence corymbose. Rocky places, in 

 the mountains. West Virginia to Tennessee (Fig. 130). 



PYRUS L. (Rosaceae) 



Deciduous shrubs or medium-sized trees. Twigs moderate, 

 round or slightly angled, sometimes ending in sharp points; pith 

 somewhat angled, continuous. Buds moderate, solitary, sessile, 

 with about 4 scales. Leaf-scars alternate, linear; bundle-traces 

 3; stipule scars none, 



a. Twigs and buds glabrous; bud-scales 

 submucronate , not margined; twigs 

 olive 1. P. communis 



a. Buds pubescent, their scales some- 

 times margined 



b. Buds blunt- ovoid; scales sub- 

 obtuse; unarmed 2. P. malus 



b. Buds conical-oblong; scales 



acute; and twigs sharp-pointed 3. P. coronaria 



1. P. communis L. Pear . Small tree, to about 15 m. high, 

 when wild often with spinescent branches; branchlets olive, glab- 

 rous or glabrate, with inconspicuous lenticels. Introduced from 

 Eurasia, spreading slightly from cultivation into thickets (Fig, 

 131). 



2. P. malus L. Apple . ( Malus pumila Mill. ). A tree to 15 

 m. tall, with spreading branches, the trunk some'.imes 1 m. in 

 diameter; twigs more or less pubescent; buds blunt- ovoid, pubes- 

 cent; scales more or less obtuse. Introduced from Eurasia, 

 spreading and naturalized (Fig. 132). 



3. P. coronaria L. Wild Crabapple .( Malus coronaria Mill.). 

 Tree, somewhat armed (at least bearing sharp-pointed twigs), 

 6-10 m. high, the trunk 2. 5-3. 5 dm. in diameter; twigs glabrate; 

 bundle-traces 3; buds conical-oblong, scales pubescent, acute. 

 Thickets, New York and Ontario to Minnesota, south to Kansas 

 and North Carolina (Fig. 133). 



