Salix arbusculoides

Andersson

Monogr. Salicum, 147, plate 8, fig. 81. 1867.

Common names: Little-tree willow
IllustratedEndemic
Treatment appears in FNA Volume 7. Treatment on page 141. Mentioned on page 46, 99.

Stems: branches gray-brown to redbrown, not glaucous, glabrous; branchlets redbrown, glabrous or puberulent. Leaves: stipules rudimentary on early ones, apex acute; petiole shallowly grooved adaxially, 3–11 mm, puberulent to glabrescent adaxially; largest medial blade very narrowly elliptic to elliptic, 38–78 × 7–18 mm, base cuneate or convex, margins slightly revolute, serrulate, apex acuminate, acute, or convex, abaxial surface glaucous (sometimes obscured by hairs), sparsely to densely long-silky, hairs (white, sometimes also ferruginous), straight, adaxial highly or slightly glossy, glabrous; proximal blade margins entire; juvenile blade yellowish green, very densely long-silky abaxially, hairs white, sometimes also ferruginous. Catkins flowering as or just before leaves emerge; staminate stout or slender, 17–43 × 5–10 mm, flowering branchlet 0–2.5 mm; pistillate densely to loosely flowered, stout to slender, 20–46 × 6–15 mm, flowering branchlet 0–6 mm; floral bract tawny or brown, 0.8–1.2 mm, apex convex to rounded, abaxially hairy, hairs straight or wavy. Staminate flowers: adaxial nectary oblong, 0.6–0.9 mm; filaments distinct; anthers purple turning yellow, ellipsoid to globose, 0.3–0.6 mm. Pistillate flowers: adaxial nectary oblong or ovate, 0.6–1 mm; ovary pyriform, beak gradually tapering to styles; ovules 16–18 per ovary; styles 0.3–0.5 mm. Capsules 4–6 mm. 2n = 38.


Phenology: Flowering mid May-early Jul.
Habitat: Stream margins, lakeshores, openings in white spruce forests, treed bogs, sedge fens, edges of alpine and arctic tundra
Elevation: 0-2000 m

Distribution

V7 153-distribution-map.gif

Alta., B.C., Man., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska.

Discussion

Glands on leaf teeth of Salix arbusculoides are sometimes covered with fine crystals of sulphur, calcium, potassium, and silicon (R. Cooper, pers. comm.), indicating that they can function as hydathodes as well as resin glands.

Selected References

None.

Lower Taxa

None.

"-0.44mm" is not declared as a valid unit of measurement for this property.

... more about "Salix arbusculoides"
21 +, 4 +, 1 +, 16 +  and 29 +
ovate +  and oblong +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
purple turning yellow +
ellipsoid +  and globose +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
elliptic to elliptic +
3.8 cm38 mm <br />0.038 m <br /> (7.8 cm78 mm <br />0.078 m <br />) +
hairy +, glaucous +  and sparsely densely long-silky +
Convex (?) +  and Rounded (?) +
7mm;18mm +
George W. Argus +
Andersson +
elliptic to elliptic +
3.8 cm38 mm <br />0.038 m <br /> (7.8 cm78 mm <br />0.078 m <br />) +
glaucous;sparsely densely long-silky +
convex +, acute +, acuminate +  and cuneate +
7mm +  and 18mm +
Salix sect. Vetrix +
tapering +
yellowish green +
ferruginous +  and white +
toothed +  and 2-fid +
persistent +
gray-brown +  and redbrown +
glabrous +  and not glaucous +
pistillate +  and densely loosely flowered +
subglobose to globose +  and stout +
2 cm20 mm <br />0.02 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
puberulent +  and glabrous +
stout +  and slender +
0 cm0 mm <br />0 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
intermediate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
pistillate +  and staminate +
pendulous +, spreading +  and erect +
staminate +
Little-tree willow +
Alta. +, B.C. +, Man. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +  and Alaska. +
0-2000 m +
brown +  and tawny +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Stream margins, lakeshores, openings in white spruce forests, treed bogs, sedge fens, edges of alpine and arctic tundra +
elliptic to elliptic +
ferruginous +  and white +
straight +
38mm;78mm +
glaucous +  and sparsely densely long-silky +
wavy +, convex +, acute +, acuminate +  and cuneate +
0.7 cm7 mm <br />0.007 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
oblong +  and narrowly broadly elliptic oblanceolate obovate or broadly obovate +
arranged +  and alternate +
marcescent +
deciduous +
elliptic to elliptic +
38mm;78mm +
glaucous +  and sparsely densely long-silky +
convex +, acute +, acuminate +  and cuneate +
7mm;18mm +
rudimentary +
2-7[-10]-carpellate +
short-silky +
pyriform +
glandular-dotted +
puberulent +  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 May-early Jul. +
Monogr. Salicum, +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +  and deciduous +
elliptic to elliptic +
3.8 cm38 mm <br />0.038 m <br /> (7.8 cm78 mm <br />0.078 m <br />) +
glaucous +  and sparsely densely long-silky +
convex +, acute +, acuminate +  and cuneate +
0.7 cm7 mm <br />0.007 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
Salix subsect. Arbusculae +
Salix arbusculoides +
Salix sect. Arbuscella +
species +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +