Smith, Trans. Linn. Soc. 6: 122. 1802.
Meadow or skeleton-leaf willow
(Andersson) C. K. Schneider
branches red-brown or violet, not or weakly glaucous, (dull or slightly glossy), puberulent; branchlets yellow-green to red-brown, sparsely pubescent or moderately densely velvety, (buds
-type or intermediate).
stipules rudimentary or absent; petiole shallowly grooved adaxially, 3-11 mm, pubescent, or velvety to glabrescent adaxially; largest medial blade lorate or very narrowly elliptic, 38-110 × 6-19 mm, 5-9 times as long as wide, base cuneate or convex, margins flat to slightly revolute, entire, serrate, serrulate, or spinulose-serrate, apex acute to acuminate, abaxial surface glaucous, densely long-silky to glabrescent, hairs (white, sometimes also ferruginous), adaxial dull or slightly glossy, glabrous or sparsely pubescent, (hairs white, sometimes also ferruginous); proximal blade margins sometimes serrulate; juvenile blade moderately densely long-silky abaxially, hairs white, sometimes also ferruginous.
flowering as leaves emerge; staminate stout to globose, 12-29 × 6-17 mm, flowering branchlet 0.8-3 mm; pistillate loosely flowered, stout to globose, 12-39 × 6-18 mm, flowering branchlet 1-11 mm; floral bract brown, tawny, light rose, or bicolor, 1-2 mm, apex rounded, abaxially sparsely hairy, hairs straight.
adaxial nectary square, ovate, or oblong, 0.3-0.7 mm; filaments distinct, hairy basally; anthers purple turning yellow, ellipsoid or globose, 0.4-0.6 mm.
adaxial nectary oblong to ovate, 0.3-0.9 mm; stipe 1.5-4 mm; ovary pyriform, beak abruptly tapering to styles; ovules 6-12 per ovary; styles 0-0.5 mm; stigmas slenderly to broadly cylindrical, 0.26-0.4-0.8 mm.
Flowering mid Apr-mid Jun. Sedge meadows, openings in moist, low, rich deciduous woods, sandy or peaty wet prairies, lakeshores; 10-2700 m; Alta., B.C., Man., N.B., N.W.T., N.S., Ont., P.E.I., Que., Sask.; Colo., Conn., Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Nebr., N.H., N.J., N.Y., N.Dak., Ohio, Pa., S.Dak., Vt., Wis.
for a comparative description.
Because reproductive barriers between
are weak, A. Mosseler (1990) suggested that their morphological variability may be due to interspecific gene flow.
forms natural hybrids with
S. bebbiana, S. candida, S. eriocephala, S. famelica, S. pellita
. Hybrids with
have been reported (M. L. Fernald 1950) but no convincing specimens have been seen. Controlled pollinations with
produced no seed (A. Mosseler 1990).
from Massachusetts and Pennsylvania (C. K. Schneider 1921) probably refer to the densely sericeous variant of
. It is sometimes named
(Andersson) C. K. Schneider but does not seem to be a hybrid (G. W. Argus 1965, 1986; E. G. Voss 1972-1996, vol. 2).