Salix alaxensis

(Andersson) Coville

Proc. Wash. Acad. Sci. 2: 280. 1900.

Common names: Felt-leaf willow
Illustrated
Basionyms: Salix speciosa var. alaxensis Andersson in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 16(2): 275. 1868
Treatment appears in FNA Volume 7. Treatment on page 146. Mentioned on page 25, 98, 148, 159.

Shrubs or trees, 1–7 m. Stems: branches yellowbrown or redbrown, not glaucous, glabrous or villous; branchlets gray-brown or redbrown, glabrescent or villous. Leaves: stipules (sometimes marcescent), foliaceous, (3–23 mm), apex acuminate to acute; petiole convex to flat, or shallowly grooved adaxially, 3–20 mm, tomentose adaxially, (strongly ventricose around floral buds); largest medial blade broadly oblong, narrowly oblong, narrowly elliptic to elliptic, narrowly oblanceolate, oblanceolate, obovate, or broadly obovate, 50–110 × 13–35 mm, 2–4 times as long as wide, base cuneate or convex, margins strongly revolute, entire or crenate, apex acuminate, acute, or convex, abaxial surface glaucous or not (usually obscured by hairs, midrib yellowish), densely tomentose or villous-tomentose, hairs wavy, adaxial dull, sparsely or moderately densely villous (floccose) to glabrescent, (hairs white or gray); proximal blade margins entire; juvenile blade reddish or yellowish green (color often obscured by hairs), very densely woolly-tomentose abaxially, hairs white. Catkins flowering before leaves emerge; staminate stout, 23–55 × 13–27 mm, flowering branchlet 0–6 mm; pistillate densely flowered, slender to stout, 33–103 × 8–22 mm, flowering branchlet 0–13 mm; floral bract brown or black, 1.5–2–2.5 mm, apex acute to convex, abaxially sparsely hairy, hairs straight. Staminate flowers: adaxial nectary narrowly oblong to oblong, 0.5–1.4 mm; filaments distinct; anthers purple turning yellow, long-cylindrical, 0.6–0.9 mm. Pistillate flowers: adaxial nectary narrowly oblong, 0.6–1.6 mm; stipe 0–0.4 mm; ovary pyriform, (hairs refractive, wavy), beak gradually tapering to styles; ovules 14–18 per ovary; styles 1.3–2.8 mm; stigmas 0.4–0.99–1.28 mm. Capsules 4–5 mm.

Distribution

V7 163-distribution-map.gif

Alta., B.C., Man., N.W.T., Nunavut, Que., Yukon, Alaska, Asia (n), Asia (e Siberia)

Discussion

Varieties 2 (2 in the flora).

Salix alaxensis is often used in northern regions for revegetation of disturbed sites and for wildlife habitat restoration (R. A. Densmore et al. 1987).

Selected References

None.

Key

1 Branchlets not noticeably glaucous, very densely villous; largest medial blades: midrib evident, moderately densely tomentose to sparsely pubescent, abaxial surface not noticeably glaucous. Salix alaxensis var. alaxensis
1 Branchlets strongly glaucous, glabrescent or sparsely villous; largest medial blades: midrib prominent, sparsely pubescent to glabrescent, abaxial surface noticeably glaucous or not. Salix alaxensis var. longistylis

"-2.5mm" is not declared as a valid unit of measurement for this property."-1.28mm" is not declared as a valid unit of measurement for this property.

... more about "Salix alaxensis"
21 +, 4 +, 1 +, 16 +  and 29 +
114 +, 95 +, 76 +, 57 +  and 38 +
villous-tomentose +, tomentose +, not +  and glaucous +
oblong +  and narrowly oblong +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
moderately densely villous;glabrescent +
purple turning yellow +
long-cylindrical +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Acute (?) +  and Convex (?) +
George W. Argus +
(Andersson) Coville +
convex +  and cuneate +
Salix speciosa var. alaxensis +
tapering +
yellowish green +  and reddish +
ferruginous +  and white +
woolly-tomentose +
toothed +  and 2-fid +
persistent +
redbrown +  and yellowbrown +
villous +, glabrous +  and not glaucous +
flowered +  and pistillate +
villous +  and glabrescent +
slender +  and stout +
0 cm0 mm <br />0 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
intermediate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
pendulous +, spreading +  and erect +
Felt-leaf willow +
Alta. +, B.C. +, Man. +, N.W.T. +, Nunavut +, Que. +, Yukon +, Alaska +, Asia (n) +  and Asia (e Siberia) +
black +  and brown +
pistillate +  and staminate +
bisexual +  and unisexual +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
5 cm50 mm <br />0.05 m <br /> (11 cm110 mm <br />0.11 m <br />) +
obovate +, oblanceolate +, elliptic to elliptic +  and oblong +
1.3 cm13 mm <br />0.013 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
crenate +, entire +  and revolute +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
convex;flat +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Proc. Wash. Acad. Sci. +
overlapping +
distinct +
Illustrated +
decumbent;erect +
non-papillate +
cylindrical +
0 cm0 mm <br />0 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
persistent +  and deciduous +
Salix alaxensis +
Salix sect. Villosae +
species +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +