264 OHIO STATE ACADEMY OF SCIENCE. 
Branches pendent, leaves small, very fine net veined, 
primaries and secondaries irregular; capsules short 
globose conic, remaining green in fruit, staminate 
plants practically unknown. S. babylonica. 
Shrub, often growing in dense clumps with many slender 
stems; leaves often very long, linear-oblong, with a 
strong marginal vein and distant primaries, smaller 
veins except a few costals vanishing; catkins often 
in cymose clusters which continue flowering all sum- 
mer, or the earliest only leafy bracted. SS. interior. 
Leaves short and broad (more than 1 cm.) inclined to 
be very wooly; cymose clusters of catkins very pro- 
nounced, carpellate plant rare. S. interior wheelert. 
Filaments glabrous, catkins coming before or with the 
leaves but not on leafy branches unless in fruit. 
Capsules pubescent at least in flower. 
Styles short and inconspicuous, less than half as long 
as ovulary. 
Leaves mostly broad, coarsely serrate or entire; cap- 
sules long conic, very hairy; upright, many 
stemmed shrubs preferring lowland swamps. 
Capreae. 
Catkins at anthesis seldom 2 cm. long, not very 
wooly, bracts conspicuous, scales light brown, 
persistent, pedicel very long, filaments slender; 
venation prominent below, leaves dirty white 
tomentose, especially on the veins. S. bebbiana. 
Catkins seldom less than 2 cm. long, wooly pussies, 
bracts small, scales almost black, filaments 
thick, pedicel medium; leaves mostly glabres- 
cent, veins not very prominent below. 
S. discolor. 
Leaves narrow. 
Leaves undulate-revolute to entire, primaries prom- 
inent on the under surface, distant, coming 
out at right angles and arching or looping 
regularly to the base of the leaf; aments small 
short pussies without leafy bracts, capsules 
long conic, very hairy; upland swamps and 
hillsides. S. humilis. 
As above but smaller throughout; leaves up to 
5 cm. long, aments less than 1 cm. long, 
shrub less than 1 m. tall; prairies especially. 
S. humilis tristts. 
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