Salix commutata

Bebb

Bot. Gaz. 13: 110. 1888.

Common names: Under-green willow
IllustratedEndemic
Synonyms: Salix commutata var. denudata Bebb Salix commutata subsp. mixta Piper Salix commutata var. puberula Bebb Salix commutata var. sericea Bebb
Treatment appears in FNA Volume 7. Treatment on page 105. Mentioned on page 101, 102, 106, 107, 114, 115, 149.

Plants 0.2–3 m. Stems: branches yellowbrown, gray-brown, or redbrown, not or weakly glaucous, pilose; branchlets yellow-green, yellowbrown, or redbrown, pilose to densely villous or woolly. Leaves: stipules (sometimes marcescent), foliaceous, apex rounded or acute; petiole shallowly grooved or convex to flat adaxially, 1.5–11 mm, pilose or tomentose adaxially; largest medial blade (sometimes amphistomatous), narrowly oblong, oblong, elliptic, or broadly elliptic, 10–100 × 5–44 mm, 1.5–3.4 times as long as wide, base convex, rounded, subcordate, or cordate, margins flat or slightly revolute, entire or serrulate, apex acuminate, acute, or convex, abaxial surface not glaucous, moderately densely tomentose, villous, or pilose to glabrescent, hairs wavy or straight, adaxial dull or slightly glossy, pilose or moderately densely villous to glabrescent; proximal blade margins entire or shallowly serrulate; juvenile blade yellowish green, sparsely to densely long-silky-tomentose abaxially, hairs white. Catkins flowering as leaves emerge; staminate stout or subglobose, 15–37 × 8–20 mm, flowering branchlet 2–33 mm; pistillate densely or moderately densely flowered, slender, stout, or subglobose, 17–60 × 7–15 mm, flowering branchlet 3–15 (–30) mm; floral bract tawny, brown, or bicolor, 1–3 mm, apex acute or rounded, abaxially hairy, hairs straight or wavy. Staminate flowers: adaxial nectary oblong or square, 0.2–0.8 mm; filaments distinct, glabrous; anthers yellow or purple turning yellow, 0.4–1 mm. Pistillate flowers: adaxial nectary oblong, square, or ovate, 0.3–0.7 mm, shorter than stipe; stipe 0.3–2 mm; ovary pyriform or obclavate, glabrous, beak gradually to abruptly tapering to styles; ovules 10–28 per ovary; styles 0.5–1.5 mm; stigmas flat, abaxially non-papillate with rounded tip, broadly cylindrical, or 2 plump lobes, 0.16–0.34–0.4 mm. Capsules 3.5–8 mm. 2n = 38.


Phenology: Flowering late May-mid Aug.
Habitat: Rocky alpine and subalpine slopes, glacial moraine, open spruce woods, streamsides, gravel benches along streams, wet fens
Elevation: 0-2400 m

Distribution

V7 104-distribution-map.gif

Alta., B.C., N.W.T., Sask., Yukon, Alaska, Idaho, Mont., Oreg., Wash.

Discussion

The rare occurrence in Salix commutata of plants with ovary indumentum composed of divergent, straight or wavy, flattened hairs may be hybrids with 53. S. eastwoodiae (see for discussion and comparison).

Hybrids:

Salix commutata forms natural hybrids with S. barclayi, S. barrattiana, and S. eastwoodiae.

Selected References

None.

Lower Taxa

None.

"-0.4mm" is not declared as a valid unit of measurement for this property.

... more about "Salix commutata"
21 +, 4 +, 1 +, 16 +  and 29 +
pilose +  and glabrescent +
ovate +, square +  and oblong +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
moderately densely villous;glabrescent +
glossy +  and dull +
purple turning yellow +  and yellow +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Rounded (?) +, Acute (?) +, Convex (?) +  and Acuminate (?) +
intermediate +
George W. Argus +
cordate +, subcordate +, rounded +  and convex +
Salix tribe Hastatae +
tapering +
yellowish green +
ferruginous +  and white +
serrulate +  and entire +
long-silky-tomentose +
toothed +  and 2-fid +
persistent +
redbrown +, gray-brown +  and yellowbrown +
pilose +  and glaucous +
flowered +, or +  and pistillate +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
pilose +  and densely villous or woolly +
subglobose +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
intermediate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
pendulous +, spreading +  and erect +
Under-green willow +
Alta. +, B.C. +, N.W.T. +, Sask. +, Yukon +, Alaska +, Idaho +, Mont. +, Oreg. +  and Wash. +
0-2400 m +
bicolor +, brown +  and tawny +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Rocky alpine and subalpine slopes, glacial moraine, open spruce woods, streamsides, gravel benches along streams, wet fens +
straight +
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 +
10mm;100mm +
0.5 cm5 mm <br />0.005 m <br /> (4.4 cm44 mm <br />0.044 m <br />) +
serrulate +  and entire +
revolute +  and flat +
2-7[-10]-carpellate +
obclavate +  and pyriform +
convex to flat +  and grooved +
glandular-dotted +
tomentose +  and pilose +
usually convex;flat +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Flowering late May-mid Aug. +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
persistent +  and deciduous +
Salix commutata var. denudata +, Salix commutata subsp. mixta +, Salix commutata var. puberula +  and Salix commutata var. sericea +
Salix commutata +
Salix sect. Hastatae +
species +
rounded +
sympodial +, branching +  and heterophyllous +