THE WILLOWS OF OHIO. 



273 



5. nigra 

 Range extended 



north and south 

 large tree, branches 

 crooked, ascend- 

 ing 



S. Ion gi pes 

 south of 39° lat. 



5. amygdaloides 

 north and west 



small spreading top large, branches 

 straight 



stems in clumps 



single 



single 



old bark flaky 



deeply laticed ridg'y 



smooth or roughish 



twigs very brittle at 



tenacious 



somewhat brittle 



base 







hardy 



buds winter-killed 



hardy 



shoots pubescent 



hoary pubescent 



glabrous 



leaves oblong or lin- 



same or broader 



ovate-lanceolate 



ear lanceolate 







bases acute to trun- 



acute to auriculate 



acute to cordate 



cate 







under surface green 



whitish glaucous 



bluish glaucous 



venation very min- 



without marginal 



coarser more regular 



ute, strong mar- 







ginal 







petiole short 



short 



very long 



stipules pointed, 



obtuse, persistent, 



obtuse, caducous, al- 



persistent, non- 



non glandular 



ways glandular 



glandular 







blossoms about Ap- 



May 5 



April 15 



ril 25 







stamens mostly less 



4—7 mostly 5-6 



6-9 



than 6 







scales short, obtuse 



ovate 



ovate-oblong, acute 



capsules ovoid coni- 



globose conical 



ovoid conical 



cal 







pedicel short , slender 



long, stout 



long, stoutish 



notched stigmas and 



both poorly devel- 



as in nigra. 



style 



oped. 





Salix nigra Marsh. Black Willow. 



A tree occasionally reaching a height of 40 meters and a 

 trunk diameter of 1 meter but generally dying when about 15 

 meters tall. It most often grows in characteristic straggling 

 clumps with four or five crooked, leaning stems. In the fall it 

 drops off most of the season's twigs leaving the old branches bare, 

 a habit which hinders their elongation and in a few years makes 

 them thick and stubby. This excess of self -pruning together 

 with the straggling clumps in which it grows give it a habit which 

 n typical specimens clearly distinguishes it from any other 



