Salix petiolaris

Smith

Trans. Linn. Soc. 6: 122. 1802.

Common names: Meadow or skeleton-leaf willow
IllustratedEndemic
Synonyms: Salix gracilis Andersson Salix gracilis var. textoris Fernald Salix petiolaris var. gracilis (Andersson) Andersson Salix ×subsericea
Treatment appears in FNA Volume 7. Treatment on page 152. Mentioned on page 26, 37, 42, 47, 57, 99, 121, 122, 130, 135, 137, 142, 15.

Plants 1–6 m. Stems: branches redbrown or violet, not or weakly glaucous, (dull or slightly glossy), puberulent; branchlets yellow-green to redbrown, sparsely pubescent or moderately densely velvety, (buds alba-type or intermediate). Leaves: 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. Catkins 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. Staminate flowers: 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. Pistillate flowers: 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. Capsules 5–9 mm. 2n = 38.


Phenology: Flowering mid Apr-mid Jun.
Habitat: Sedge meadows, openings in moist, low, rich deciduous woods, sandy or peaty wet prairies, lakeshores
Elevation: 10-2700 m

Distribution

V7 175-distribution-map.gif

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.

Discussion

See 107. Salix sericea for a comparative description.

Because reproductive barriers between Salix petiolaris and S. eriocephala are weak, A. Mosseler (1990) suggested that their morphological variability may be due to interspecific gene flow.

Hybrids:

Salix petiolaris forms natural hybrids with S. bebbiana, S. candida, S. eriocephala, S. famelica, S. pellita, and S. sericea. Hybrids with S. alba have been reported (M. L. Fernald 1950) but no convincing specimens have been seen. Controlled pollinations with S. discolor produced no seed (A. Mosseler 1990).

Reports of Salix petiolaris × S. sericea from Massachusetts and Pennsylvania (C. K. Schneider 1921) probably refer to the densely sericeous variant of S. petiolaris. It is sometimes named S. ×subsericea (Andersson) C. K. Schneider but does not seem to be a hybrid (G. W. Argus 1965, 1986; E. G. Voss 1972–1996, vol. 2).

Selected References

None.

Lower Taxa

None.

"-0.8mm" is not declared as a valid unit of measurement for this property.

... more about "Salix petiolaris"
21 +, 4 +, 1 +, 16 +  and 29 +
densely long-silky +  and glabrescent +
oblong +  and ovate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
pubescent;glabrous +
glossy +  and dull +
purple turning yellow +
globose +  and ellipsoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Rounded (?) +, Acute (?) +  and Acuminate (?) +
George W. Argus +
convex +  and cuneate +
Salix sect. Vetrix +
tapering +
ferruginous +  and white +
toothed +  and 2-fid +
persistent +
violet +  and redbrown +
puberulent +  and glaucous +
flowered +  and pistillate +
velvety +  and pubescent +
slender +  and stout +
0.1 cm1 mm <br />0.001 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
intermediate +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
pendulous +, spreading +  and erect +
Meadow or skeleton-leaf willow +
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. +  and Wis. +
10-2700 m +
bicolor +, light rose +, tawny +  and brown +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Sedge meadows, openings in moist, low, rich deciduous woods, sandy or peaty wet prairies, lakeshores +
ferruginous +  and white +
straight +
flattened +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
3.8 cm38 mm <br />0.038 m <br /> (11 cm110 mm <br />0.11 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
spinulose-serrate +, serrulate +, serrate +  and entire +
flat +  and slightly revolute +
2-7[-10]-carpellate +
short-silky +
pyriform +
glandular-dotted +
velvety +  and glabrescent +
usually convex;flat +
0.3 cm3 mm <br />0.003 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Flowering mid Apr-mid Jun. +
Trans. Linn. Soc. +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +  and deciduous +
Salix gracilis +, Salix gracilis var. textoris +, Salix petiolaris var. gracilis +  and Salix ×subsericea +
Salix petiolaris +
Salix sect. Geyerianae +
species +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +