Salix jepsonii

C. K. Schneider

J. Arnold Arbor. 1: 89. 1919.

Common names: Jepson’s willow
Endemic
Basionyms: Salix sitchensis var. angustifolia Bebb Willows Calif., 87. 1879,
Synonyms: Salix pellita var. angustifolia (Bebb) B. Boivin Salix sitchensis var. ralphiana (Jepson) Jepson
Treatment appears in FNA Volume 7. Treatment on page 160. Mentioned on page 100.

Shrubs, 1–3 m, (sometimes forming clones by stem fragmentation). Stems: branches (highly brittle at base), yellowbrown or redbrown, weakly glaucous or not, (dull or slightly glossy), velvety or short-silky to glabrescent; branchlets gray-brown or redbrown, sparsely or moderately densely short-silky or velvety, (buds caprea-type or intermediate). Leaves: stipules usually rudimentary, sometimes foliaceous on early ones, foliaceous on late ones, apex acute; petiole shallowly grooved, or convex to flat adaxially, 3–12 mm, short-silky or velvety adaxially; largest medial blade lorate, narrowly oblanceolate, or oblanceolate, 43–74–103 × 8–25 mm, 2.9–4.8–7.7 times as long as wide, base convex or cuneate, margins slightly revolute to flat, entire, apex acuminate, convex, or acute, abaxial surface glaucous (sometimes obscured by hairs), densely short-silky, hairs straight, adaxial dull (sometimes thinly glaucous) to slightly glossy, sparsely short or long-silky; proximal blade margins entire; juvenile blade yellowish green or reddish, densely long-silky abaxially, hairs white. Catkins flowering as leaves emerge; staminate stout or subglobose, 16–16.5 × 11–13 mm, flowering branchlet 2.5–3 mm; pistillate moderately densely flowered, slender to stout, 33–55 × 10–11 mm, flowering branchlet 1.5–7 mm; floral bract brown or tawny, 0.8–2 mm, apex rounded or acute, abaxially hairy, hairs straight. Staminate flowers: adaxial nectary narrowly oblong to oblong, 0.4–0.8 mm; stamens 1 or 2; filaments distinct or connate less than 1/2 their lengths, hairy on proximal 1/2; anthers purple turning yellow, ellipsoid or shortly cylindrical, 0.6–0.8 mm. Pistillate flowers: adaxial nectary oblong to narrowly oblong or flask-shaped, 0.3–0.6 mm, shorter than or equal to stipe; stipe 0.4–1.2 mm; ovary pyriform, densely long-silky, beak gradually tapering to styles; ovules 13–18 per ovary; styles 0.4–0.6 mm; stigmas flat, abaxially non-papillate with rounded to pointed tip, 0.2–0.3 mm. Capsules 3–5 mm.


Phenology: Flowering mid-late Jun.
Habitat: Margins of lakes and streams, wet meadows, gravel, rocky, or bouldery substrates, granite
Elevation: 1000-3400 m

Discussion

R. D. Dorn (2000) justified treating Salix jepsonii as S. sitchensis var. angustifolia based on specimens of S. jepsonii from southern Oregon. Salix jepsonii does occur in southern Oregon but is distinct enough from S. sitchensis to be treated as a species.

Selected References

None.

Lower Taxa

None.

"-103mm" is not declared as a valid unit of measurement for this property.

... more about "Salix jepsonii"
21 +, 4 +, 1 +, 16 +  and 29 +
114 +, 95 +, 76 +, 57 +  and 38 +
short-silky +  and glaucous +
oblong +  and narrowly oblong or flask-shaped +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
dull +  and slightly glossy +
purple turning yellow +
cylindrical +  and ellipsoid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Acute (?) +, Rounded (?) +, Convex (?) +  and Acuminate (?) +
George W. Argus +
C. K. Schneider +
cuneate +  and convex +
Salix sitchensis var. angustifolia +
tapering +
reddish +  and yellowish green +
ferruginous +  and white +
toothed +  and 2-fid +
persistent +
flowered +  and pistillate +
velvety +  and short-silky +
subglobose +
slender +  and stout +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
intermediate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
pendulous +, spreading +  and erect +
Jepson’s willow +
Calif. +, Nev. +  and Oreg. +
1000-3400 m +
connate +  and distinct +
tawny +  and brown +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Margins of lakes and streams, wet meadows, gravel, rocky, or bouldery substrates, granite +
straight +
flattened +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
oblanceolate +  and lorate +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
slightly revolute +  and flat +
rudimentary +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
velvety +  and short-silky +
convex;flat +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering mid-late Jun. +
J. Arnold Arbor. +
overlapping +
distinct +
redbrown +  and yellowbrown +
decumbent;erect +
non-papillate +
cylindrical +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
persistent +  and deciduous +
Salix pellita var. angustifolia +  and Salix sitchensis var. ralphiana +
Salix jepsonii +
Salix sect. Sitchenses +
species +
rounded +  and pointed +
sympodial +, branching +  and heterophyllous +