THE WILLOWS OF OHIO. 299 



Salix eriocephala Michx. of Britton's manual includes those 

 forms with ferruginous hair on the leaves and tonn 



Salix prinoides Pursh, is a narrow leaved form of the type. 



It is common in swamps all over the state. 



This s] is most difficult to separate from S. cordata in 



leaf but its upright habit and the coar ation as i ted 



with the sprawling habit and sharp-toothed leaves of S. cordata 



sufficient to distinguish them. As described under Salix 

 biana it sometinn meets with that species. Narrow revo- 



lute-leaved forms are sometimes found which connect tl 

 with S. humilis, probably some of them are hybrids. 



Salix humilis Marsh. Prairie Willow. 



A shrub not more than :\ meters tall with spreading often 

 cumbent branches. Leaves oblong or spatulate, gradually nar- 

 rowed to the base, abruptly acute and sometimes mucronate at 

 the tij>, mostlv revolute. entire to undulate-dentate, puberulent 

 or glabrous above, tomentose, especially on the prominently r; 

 ed veins beneath, or glabrous and glaucous, primary veins rather 

 distant, inclined to be horizontal, looping or oftener branching 

 and arching, with ral costals between them, secondaries 



quite irregular, catkin- horn very much as those of >. discolor, 

 long before the leaves but -mailer than in that species, from 

 short stubby pussies, staminate 2 cm. long or shorter, carpellate 

 asionally 4.."> em. in fruit, bracts small or none, scales dark- 

 d above, long pilose on the back, glabrous in front, capsules 

 elongated, often rostrate-conic in fruit, hirsute at leasl when 

 young, pedicelled, sometimes almost 1 cm. l< ng when ripe, style 

 distinct, red. 



alix humilis though common nowhere is generally distri- 

 buted over tin' state. It will probably be fi und growing on dry 

 ides in near) unty. 



In forms Salix humilis is easily recognizable in 1. 



e volute leaves. In flower it is char- 

 by tin- short stubby pus ies from which the flo\ 

 The leaves of the ranker shool n an appearance 



nnilar to 1 [1 ucli bran* ' 



that many of tl.' tiled hybn ur herbaria came but real 



hybrids undoubtedly do occur. S< i the pi 



mnlar to V i andida, bul i rdinarily il 

 plant while 5. Candida ha vhite wool on the und< 



Plati \ 

 



(uppei 

 S. numtlis; nat 

 lltcida, > ill. ir:-< 'I Hv< 



