Salix pyrifolia

Andersson

Monogr. Salicum, 162, plate 8, fig. 93. 1867.

Common names: Balsam willow
IllustratedEndemic
Synonyms: Salix balsamifera Barratt ex Andersson Salix pyrifolia var. lanceolata (Bebb) Fernald
Treatment appears in FNA Volume 7. Treatment on page 115. Mentioned on page 88, 101, 102, 116, 118, 127.

Plants 0.4–4 m. Stems: branches redbrown, not glaucous, (highly glossy), glabrous; branchlets redbrown, yellowbrown, or yellowish, (not or weakly glaucous), glabrous, (inner membranaceous bud-scale layer free, not separating from outer layer). Leaves: stipules (early deciduous), foliaceous or rudimentary on early ones, foliaceous on late ones, apex acute, convex, or rounded; petiole convex to flat, or shallowly grooved adaxially, 7–20 mm, glabrous or sparsely velvety adaxially; largest medial blade narrowly oblong, oblong, elliptic, or broadly elliptic, 30–103 × 19–40 mm, 1.5–3.4 times as long as wide, base cordate, subcordate, rounded or convex, margins flat or slightly revolute, serrulate, irregularly serrate, crenate, or sinuate, apex acute or acuminate, abaxial surface glaucous, glabrous, adaxial slightly or highly glossy, glabrous; proximal blade margins serrulate or entire; juvenile blade translucent, glabrous or pilose abaxially, hairs white. Catkins: staminate flowering just before leaves emerge, pistillate flowering as leaves emerge; staminate stout or slender, 18.5–63 × 7–15 mm, flowering branchlet 1–5 mm; pistillate loosely flowered, stout or slender, 25–85 × 8–20 mm, flowering branchlet 2–22 mm; floral bract tawny, 1–2.4 mm, apex acute or convex, abaxially sparsely to moderately densely hairy, hairs straight or wavy. Staminate flowers: adaxial nectary square or ovate, 0.3–0.5 mm; filaments distinct, glabrous or sparsely hairy basally; anthers yellow, (ellipsoid or shortly cylindrical), 0.5–0.8 mm. Pistillate flowers: adaxial nectary narrowly ovate or square, 0.3–0.7 mm, shorter than stipe; stipe 1.8–3.5 mm; ovary obclavate, glabrous, beak slightly bulged below styles; ovules 10–19 per ovary; styles 0.4–0.5 mm; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.2–0.23–0.32 mm. Capsules 7–8 mm. 2n = 38.


Phenology: Flowering May-mid Jun(-mid Jul in subalpine).
Habitat: Fens, wet lake and slough margins, treed bogs
Elevation: 0-300 m (-1600 m in subalpine)

Distribution

V7 117-distribution-map.gif

Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon, Maine, Mich., Minn., N.H., N.Y., Vt., Wis.

Discussion

Salix pyrifolia is characterized by juvenile leaves membranaceous and translucent, and largest medial leaves subcoriaceous, with abaxial surfaces reticulate, and with bases often cordate. Buds and foliage are reported to have a balsam-like fragrance.

Hybrids:

Salix pyrifolia forms natural hybrids with S. brachycarpa var. psammophila. Hybrids with S. discolor have been reported (C. K. Schneider 1921; M. L. Fernald 1950) but no convincing specimens have been seen.

Selected References

None.

Lower Taxa

None.

"-0.32mm" is not declared as a valid unit of measurement for this property.

... more about "Salix pyrifolia"
21 +, 4 +, 1 +, 16 +  and 29 +
glabrous +  and glaucous +
square +  and ovate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Convex (?) +, Acute (?) +, Acuminate (?) +  and Rounded (?) +
intermediate +
George W. Argus +
Andersson +
convex +, rounded +, subcordate +  and cordate +
Salix tribe Hastatae +
tapering +
ferruginous +  and white +
entire +  and serrulate +
pilose +  and glabrous +
toothed +  and 2-fid +
persistent +
glabrous +  and not glaucous +
flowered +  and sessile +
subglobose to globose +  and stout +
slender +  and stout +
0.2 cm2 mm <br />0.002 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
intermediate +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
flowered +, pistillate +  and staminate +
2.5 cm25 mm <br />0.025 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
pendulous +, spreading +  and erect +
slender +, stout +  and staminate +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Balsam willow +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Maine +, Mich. +, Minn. +, N.H. +, N.Y. +, Vt. +  and Wis. +
0-300 m (-1600 m in subalpine) +
hairy +  and glabrous +
0.1 cm1 mm <br />0.001 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Fens, wet lake and slough margins, treed bogs +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
3 cm30 mm <br />0.03 m <br /> (10.3 cm103 mm <br />0.103 m <br />) +
1.9 cm19 mm <br />0.019 m <br /> (4 cm40 mm <br />0.04 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
rudimentary +
sinuate +, crenate +, serrate +, revolute +  and flat +
2-7[-10]-carpellate +
obclavate +
glandular-dotted +
velvety +  and glabrous +
convex;flat +
0.7 cm7 mm <br />0.007 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering May-mid Jun(-mid Jul in subalpine). +
Monogr. Salicum, +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +  and deciduous +
Salix balsamifera +  and Salix pyrifolia var. lanceolata +
Salix pyrifolia +
Salix sect. Hastatae +
species +
rounded +
sympodial +, branching +  and heterophyllous +