Salix sessilifolia

Nuttall

N. Amer. Sylv. 1: 68. 1842.

Common names: Northwest sandbar willow
Endemic
Synonyms: Salix exigua var. sessilifolia (Nuttall) Dorn Salix fluviatilis var. sessilifolia (Nuttall) Scoggan Salix longifolia var. sessilifolia (Nuttall) M. E. Jones Salix macrostachya Nuttall Salix macrostachya var. cusickii Rowlee Salix sessilifolia var. villosa Andersson
Treatment appears in FNA Volume 7. Treatment on page 59. Mentioned on page 52, 53, 60.

Shrubs, 3–5 m. Stems: branches gray-brown or redbrown, hairy or glabrous; branchlets redbrown, densely villous. Leaves: stipules absent or rudimentary on early ones, rudimentary or foliaceous on late ones (apex acute); petiole 1–6 mm, long-silky adaxially; largest medial blade (sometimes hypostomatous, glands submarginal), linear, lorate, narrowly elliptic, or narrowly oblanceolate, 40–120 × 7.5–16 mm, 3–8.5 times as long as wide, base cuneate or convex, margins flat, remotely spinulose-serrulate, apex acuminate, acute, or caudate, abaxial surface not glaucous, densely to sparsely long or short-silky or villous, hairs appressed or spreading, straight or wavy, adaxial dull, sparsely long-silky or villous; proximal blade margins entire; juvenile blade yellowish green, very densely long-silky or villous abaxially. Catkins: staminate 38–45 × 6–7 mm, flowering branchlet 25–45 mm; pistillate densely flowered, slender, 40–73 × 6–7 mm, flowering branchlet 20–32 mm; floral bract (sometimes brown), 2.4–3.2 mm, apex acute or rounded, entire or irregularly toothed, abaxially hairy, hairs wavy. Staminate flowers: abaxial nectary 0.4–1 mm, adaxial nectary narrowly oblong, oblong, or flask-shaped, 0.5–1.1 mm, nectaries distinct; filaments hairy on proximal 1/2; anthers 0.8–1.2 mm. Pistillate flowers: adaxial nectary oblong, square, ovate, or flask-shaped, 0.6–1 mm, longer than stipe; stipe 0.2–0.7 mm; ovary pyriform, villous or long-silky, beak abruptly tapering to styles; ovules 24–36 per ovary; styles 0.1–0.7 mm; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical, 0.4–1 mm. Capsules 4–5.5 mm.


Phenology: Flowering late Apr-late May.
Habitat: Riparian, streamshores, floodplains, sandy or gravelly substrates
Elevation: 0-200 m

Discussion

Hybrids:

Salix sessilifolia forms natural hybrids with S. columbiana and S. melanopsis.

Selected References

None.

Lower Taxa

None.

... more about "Salix sessilifolia"
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
short-silky or villous +  and long +
flask--shaped +, ovate +, square +  and oblong +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
villous;long-silky +
reddish turning yellow +  and yellow +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
Toothed (?) +, Entire (?) +, Rounded (?) +, Acute (?) +, Caudate (?) +  and Acuminate (?) +
George W. Argus +
Nuttall +
convex +  and cuneate +
Longifoliae +
tapering +
yellowish green +
villous +  and long-silky +
toothed +  and 2-fid +
deciduous +
redbrown +  and gray-brown +
glabrous +  and hairy +
stout +  and slender +
2 cm20 mm <br />0.02 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
flowered +, pistillate +  and staminate +
4 cm40 mm <br />0.04 m <br /> (7.3 cm73 mm <br />0.073 m <br />) +
pendulous +, spreading +  and erect +
slender +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Northwest sandbar willow +
B.C. +, Oreg. +  and Wash. +
0-200 m +
pistillate +  and staminate +
bisexual +  and unisexual +
Riparian, streamshores, floodplains, sandy or gravelly substrates +
straight +
spreading +  and appressed +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hypostomatous +  and amphistomatous +
oblanceolate +, elliptic +, lorate +  and linear +
arranged +  and alternate +
marcescent +
deciduous +
40mm;120mm +
oblanceolate +, elliptic +, lorate +  and linear +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
spinulose-serrulate +
2-7[-10]-carpellate +
long-silky +  and villous +
pyriform +
glandular-dotted +
flat;convex +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Flowering late Apr-late May. +
N. Amer. Sylv. +
overlapping +
distinct +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
persistent +  and deciduous +
Salix exigua var. sessilifolia +, Salix fluviatilis var. sessilifolia +, Salix longifolia var. sessilifolia +, Salix macrostachya +, Salix macrostachya var. cusickii +  and Salix sessilifolia var. villosa +
Salix sessilifolia +
Salix subg. Longifoliae +
species +
pointed +
sympodial +, branching +  and heterophyllous +