Salix glauca var. acutifolia

(Hooker) C. K. Schneider

Bot. Gaz. 66: 327. 1918.

IllustratedEndemic
Basionyms: Salix villosa var. acutifolia Hooker Fl. Bor.-Amer. 2: 145. 1838
Synonyms: Salix desertorum Richardson Salix glauca subsp. acutifolia (Hooker) Hultén Salix glauca var. alicea C. R. Ball Salix glauca subsp. desertorum (Richardson) Andersson ex Hultén Salix glauca var. perstipula Raup Salix glauca var. poliophylla (C. K. Schneider) Raup Salix glauca var. sericea Hultén
Treatment appears in FNA Volume 7. Treatment on page 91. Mentioned on page 86, 89, 90.

Plants 0.3–6 m. Stems: branches redbrown or brownish, villous or pilose to glabrescent; branchlets densely villous to glabrescent. Leaves: stipules marcescent, rudimentary or foliaceous on early ones, foliaceous on late ones, usually prominent, linear to lanceolate, 2–17 mm, apex acuminate; petiole 4–27 mm, pilose adaxially; largest medial blade oblanceolate or obovate to narrowly elliptic, 43–82 × 12–39 mm, 2.2–4.8 times as long as wide, base cuneate or convex, apex acuminate or convex, abaxial surface very densely to sparsely villous-tomentose or short-silky, hairs straight, wavy, or curved, adaxial long-silky or pilose to glabrescent; proximal blade margins entire; juvenile blade densely villous or long-silky. Catkins: staminate 19–45 × 9–17 mm, flowering branchlet 2–9 mm; pistillate slender to stout, 24–83 × 8–17 mm, flowering branchlet 3–37 mm; floral bract tawny, light-brown, or bicolor, 1.5–2.5 mm, apex convex to rounded, hairs wavy. Staminate flowers: abaxial nectary 0.1–0.6 mm, adaxial nectary narrowly oblong, oblong, or square, 0.6–0.9 mm; filaments distinct, glabrous. Pistillate flowers: adaxial nectary sometimes flask-shaped; stipe 0.5–2.8 mm; ovary obclavate or pyriform, densely tomentose, short-silky, or pubescent, beak gradually tapering to styles; ovules 12–22 per ovary; styles connate to distinct 1/2 their lengths, 0.3–1.4 mm; stigmas slenderly to broadly cylindrical, 0.4–0.59–0.8 mm. Capsules 5–9 mm. 2n = 76, 95, 114.


Phenology: Flowering late May-early Jul.
Habitat: Wet to mesic thickets, black spruce treed bogs, white spruce woods, floodplains, fens, swamps, subarctic thickets, alpine tundra
Elevation: 0-1200 m

Distribution

V7 99-distribution-map.gif

B.C., N.W.T., Yukon, Alaska.

Discussion

Hybrids:

Variety acutifolia forms natural hybrids with Salix arctica and S. niphoclada.

Variety acutifolia × Salix niphoclada, known from Alaska and Yukon, is intermediate between the parents. It combines the petioles, the narrowly elliptic-oblanceolate leaves with acute-attenuate apices, the stipules, and the narrow, loosely flowered catkins of S. niphoclada, and the relatively long petioles, the larger oblanceolate leaves, the larger stipules, and the densely flowered and broadly cylindrical catkins of S. glauca (G. W. Argus 1965).

Selected References

None.

Lower Taxa

None.

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

114 +, 95 +  and 76 +
connate +  and distinct +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
long-silky or pilose +  and short +
short-silky +  and villous-tomentose +
flask--shaped +, square +  and oblong +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
pilose;glabrescent +
dull +  and glossy +
red turning yellow +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Convex (?) +  and Rounded (?) +
George W. Argus +
(Hooker) C. K. Schneider +
convex +  and cuneate +
Salix villosa var. acutifolia +
tapering +
long-silky +  and villous +
toothed +  and 2-fid +
persistent +
brownish +  and redbrown +
pilose +  and glabrescent +
densely villous +  and glabrescent +
subglobose +  and globose +
0.3 cm3 mm <br />0.003 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
2.4 cm24 mm <br />0.024 m <br /> (8.3 cm83 mm <br />0.083 m <br />) +
pendulous +, spreading +  and erect +
globose +  and subglobose +
slender +  and stout +
0.8 cm8 mm <br />0.008 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
B.C. +, N.W.T. +, Yukon +  and Alaska. +
0-1200 m +
bicolor +, light-brown +  and tawny +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
spherical +
Wet to mesic thickets, black spruce treed bogs, white spruce woods, floodplains, fens, swamps, subarctic thickets, alpine tundra +
curved +  and straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
amphistomatous +, hemiamphistomatous +  and hypostomatous +
4.3 cm43 mm <br />0.043 m <br /> (8.2 cm82 mm <br />0.082 m <br />) +
obovate +  and narrowly elliptic +
1.2 cm12 mm <br />0.012 m <br /> (3.9 cm39 mm <br />0.039 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
rudimentary +
0.1 cm1 mm <br />0.001 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
flat +  and revolute +
connate +  and distinct +
2-7[-10]-carpellate +
pubescent +, short-silky +  and tomentose +
pyriform +  and obclavate +
glandular-dotted +
flat;convex;flat;convex +
0.4 cm4 mm <br />0.004 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
Flowering late May-early Jul. +
overlapping +
distinct +
Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
decumbent;erect +
non-papillate +
cylindrical +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
caducous +  and persistent +
prominent +  and rudimentary +
linear;lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
connate +  and distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
persistent +  and deciduous +
ferruginous +  and white +
Salix desertorum +, Salix glauca subsp. acutifolia +, Salix glauca var. alicea +, Salix glauca subsp. desertorum +, Salix glauca var. perstipula +, Salix glauca var. poliophylla +  and Salix glauca var. sericea +
Salix glauca var. acutifolia +
Salix glauca +
variety +
rounded +
sympodial +, branching +  and heterophyllous +