THE WILLOWS OF OHIO. 



273 



5. nigra 



Range extended 

 north and south 



large tree, branches 

 crooked, ascend- 

 ing 



stems in clumps 



old bark flaky 



twigs very brittle at 

 base 



hardy 



shoots pubescent 



leaves oblong or lin- 

 ear lanceolate 



bases acute to trun- 

 cate 



under surface green 



venation very min- 

 ute, strong mar- 

 ginal 



petiole short 



stipules pointed, 

 persistent, non- 

 glandular 



blossoms about Ap- 

 ril 25 



stamens mostly less 

 than 6 



scale- short , obtuse 



ca] >sules ov< rid coni- 

 cal 



pedicel short . slender 



notched stigmas and 



style 



S. longipes 

 south of 39 lat. 



5. amygdaloides 

 north and west 



small spreading top large, branches 



single 



deeply laticed ridg'y 



tenacious 



buds winter-killed 

 hoary pubescent 

 same or broader 



straight 



single 



smooth or roughish 



somewhat brittle 



hardy 



glabrous 

 ovate-lanceolate 



acute to auriculate acute to cordate 



whitish glaucous bluish glaucous 



without marginal 



short 



obtuse, persistent, 

 non glandular 



May 5 



1 7 mostly 5 6 

 ovate 



globose conical 



long, stout 

 both poorly devel- 

 oped. 



coarser more regular 



very long 



obtuse, caducous, al- 

 ways glandular 



April 1") 



6 '.i 



ovate-oblong, acute 

 ovoid conical 



long, stoutish 



as m nigra. 



SALIX NIGRA Marsh. BLACK WlLLOW. 



A tree occasionally reaching a height of lit meters and a 

 trunk diameter of 1 meter but generally dying when about 15 

 meter tall, h most often grows in characteristic straggling 

 clumps with lour or five i I, leai ems. In the tall it 



drops off most of th< i ; the old branches bare, 



a habil which hinders their elongation and in a tew makes 



them thick and stubby. Tl oi elf-pruning together 



with the i raggling clumps in \\ hich it gri iws give it a habit which 

 n typical specimens clearly distingui it from any other 



