154 WOODY PLANTS 



1. H. kalmianum L. Kalm's St. John's-Wort. Slender shrub 

 2-6 dm. high, with papery whitish bark and ascending 4-edged 

 branches, and 2-edged branchlets; corymb-vestiges open. Rocky 

 soil, chiefly near the Great Lakes, Quebec to Ontario, south to 

 New York and Illinois. 



2. H. spathulatum (Spach) Steud. Shrubby St. John's Wort. 

 gl. prolificum of authors, not L. ). Shrub to 2. 5 m. high, very 

 bushy; twigs 2-edged. Dry or damp thickets. New York to Ontario 

 and Minnesota, south to Georgia, Alabama, and Arkansas (Fig. 222). 



3. H. densiflorum Pur sh. Dense -flowered Shrubby St. John's- 

 Wort. Shrub to 2 m. high, quite bushy; twigs slender, 2-edged. 

 Wet acid soil, Florida to Texas, north to New Jersey, West Vir- 

 ginia, and Missouri (Fig. 223). 



TAMARDC L. (Tamaricaceae) 



Small trees and shrubs, deciduous by the fall of slender shoots 

 bearing the small juniper-like leaves. Twigs slender, elongated; 

 pith small, rounded, continuous. Buds small, sessile, compressed 

 against the twig, solitary or multiple. Leaf-scars lacking, the twig- 

 scars taking their place. 



1. T. gallica L. Tamarisk. Glabrous shrub or small tree to 

 10 m. high; branches flexuous, red-brown; ultimate small branoh- 

 lets falling with their leaves in autumn. Introduced from Europe 

 and naturalized or casually escaped from cultivation. 



HUDSONIA L. (Cistaceae) 



Bushy heath-like low shrubs, covered with the small scale- 

 like alternate evergreen pubescent leaves. Twigs very slender, 

 terete; pith minute. Buds scarcely evident. Stipules lacking. 



1. H. tomentosa Nutt. Beach-Heath. Hoary with villous tomen- 

 tum; leaves 2 mm. long, appressed. Dunes and sandy places, 

 Quebec to Alberta, south to Illinois, and on the coastal plain to 

 North Carolina; also onhigh mountain summits. West Virginia. 



DIRCA L. (Thymelaeaceae) 



Low rounded deciduous shrubs with soft brittle wood but very 

 tough bark (the name "leatherbark" would be more appropriate). 

 Twigs rounded, glabrous, slender, light brown, or olive, enlarged 



