0 fa,Leaves glabrous on both Surfaces; pistils glabrous 
~ ~ a, Leaves typically glaucous beneath, usually prominently 
G so (see S. lasiolepis and $+ scouleriana) 
os_-4Siolepi. pe Scoulerians 
~/ Petioles with a pair of wart-like glands at the base of 
5 the blade; stamens commonly 5 
A Petioles eglandular 
i, Leaves lanceolate, long~acuminate, commonly 6-12 em, 
/0 long; stamens commonly 5 
(, Leaves Oblong, ovate or obovate, commonly 4 
on or obtuse or abruptly acuminate at the apex 
AL 
é 
stamens 2 
8 Plants Sssentially of subalpine Situations, along 
streams at higher elevations and in Subalpine meadows 
IZ 
or sphagnum bogs 
qd) /O Stipules wanting or inconspicuous; catkins 
/q4 1-2 om. long; plants of Sphagnum bogs 3 Se pedicellaris 
2 OVate or kidney-shaped, 
Serrulate; catkins 3-7 cme 
al 
| Stipules mostly conspicuous 
long; plants of stream 
bottoms 
!& Pistillate catkins subsessile; leaves coarsely 
IG glandular-serrate 
¥ S. peoucononticoy 
(2 Pistillate catkins on leafy branchlets 1-3 om. 
1 
long, leaves finely glandular-serrate or | 
od 
Subentire ' 
© Plants of lowlands along streams and lake shores 
‘4 narrowed and acute toward the base 6. Se melanonsis 
} ‘ ——. 
wW '> Leaves preveailingly Oblong, tapering abruptly above 
ix} the middle, rounded or Subcordate at the base 
