Salix exigua

Nuttall

N. Amer. Sylv. 1: 75. 1842.

WeedyIllustratedEndemic
Synonyms: Salix fluviatilis var. exigua (Nuttall) Sargent Salix longifolia var. exigua (Nuttall) Bebb
Treatment appears in FNA Volume 7. Treatment on page 54. Mentioned on page 23, 51, 52, 53, 57.

Shrubs or trees, 0.5–5 (–17) m. Stems: branches gray-brown, redbrown, or yellowbrown, villous, or tomentose to glabrescent; branchlets yellowish, yellowbrown, or redbrown, pubescent or puberulent, tomentose, short or long-silky-villous. Leaves: stipules absent or rudimentary on early ones, foliaceous or rudimentary on late ones; petiole 1–5 (–10) mm, pubescent or puberulent, villous, or short-silky adaxially; largest medial blade (sometimes hypostomatous), linear or lorate, (glands marginal), 30–136–143 × 2–14 mm, 6.5–28 (–37.5) times as long as wide, base cuneate, margins slightly revolute, entire or remotely spinulose-serrulate, apex acuminate or acute, abaxial surface glaucous (sometimes obscured by hairs), densely long-silky, villous or pilose to glabrescent, hairs appressed or spreading, straight or wavy, adaxial slightly glossy, sparsely or densely long-silky to glabrescent; proximal blade margins entire; juvenile blade yellowish green, densely long-silky-villous abaxially. Catkins: staminate 7–54 × 2–10 mm, flowering branchlet 1.5–56 mm; pistillate loosely to densely flowered, slender or stout, 14.5–70 × 3–12 mm, flowering branchlet 2–55 mm; floral bract 1.2–2.6 mm, apex acute, convex, or rounded, entire or erose, hairs wavy, straight, or crinkled, abaxially hairy throughout or proximally, or glabrate. Staminate flowers: abaxial and adaxial nectaries present and distinct; filaments hairy on proximal 1/2; anthers (sometimes reddish turning yellow). Pistillate flowers: adaxial nectary oblong, ovate, or flask-shaped, relative adaxial nectary/stipe length variable even within same catkin; stipe 0–0.9 mm; ovary obclavate or pyriform, glabrous, pilose, or villous, or sometimes beak hairy, beak bulged below or abruptly tapering to styles; ovules 12–30 per ovary; styles (sometimes distinct), 0–0.5 mm; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.1–0.5 mm. Capsules 4–8 mm. 2n = 38.

Distribution

V7 46-distribution-map.gif

Alta., B.C., Ariz., Calif., Colo., Idaho, Mont., N.Mex., Nebr., Nev., Okla., Oreg., Tex., Utah, Wash., Wyo.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Branchlets densely short-silky-tomentose or short-silky-villous; juvenile blades densely long-silky abaxially, hairs usually appressed, sometimes a few spreading; stipes 0.2-0.9 mm; styles connate, 0-0.2 mm; ovaries usually glabrous, sometimes beak hairy; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes. Salix exigua var. exigua
1 Branchlets pubescent or densely long-silky-villous; juvenile blades densely long-silky-villous abaxially, hairs spreading, appressed; stipes 0-0.2 mm; styles connate or ± distinct, 0.1-0.5 mm; ovaries pilose or villous to glabrescent; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical. Salix exigua var. hindsiana
... more about "Salix exigua"
pilose +  and glabrescent +
flask--shaped +, ovate +  and oblong +
long-silky;glabrescent +
reddish turning yellow +  and yellow +
erose +  and entire +
Rounded (?) +, Convex (?) +, Acute (?) +  and Acuminate (?) +
George W. Argus +
Nuttall +
cuneate +
Longifoliae +
tapering +
yellowish green +
long-silky-villous +
toothed +  and 2-fid +
deciduous +
yellowbrown +, redbrown +  and gray-brown +
tomentose +  and glabrescent +
long-silky-villous +, tomentose +, puberulent +  and pubescent +
stout +  and slender +
0.2 cm2 mm <br />0.002 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
pistillate +  and loosely densely flowered +
1.45 cm14.5 mm <br />0.0145 m <br /> (7 cm70 mm <br />0.07 m <br />) +
pendulous +, spreading +  and erect +
stout +  and slender +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Alta. +, B.C. +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Nebr. +, Nev. +, Okla. +, Oreg. +, Tex. +, Utah +, Wash. +  and Wyo. +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
straight +
spreading +  and appressed +
glabrate +  and hairy +
crinkled +  and wavy +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hypostomatous +  and amphistomatous +
oblanceolate +, elliptic +, lorate +  and linear +
arranged +  and alternate +
marcescent +
deciduous +
6.5-28(-37.5) +
30mm;136-143mm +
lorate +  and linear +
0.2 cm2 mm <br />0.002 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
spinulose-serrulate +  and entire +
2-7[-10]-carpellate +
villous +, pilose +  and glabrous +
pyriform +  and obclavate +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
glandular-dotted +
short-silky +, villous +, puberulent +  and pubescent +
flat;convex +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
N. Amer. Sylv. +
overlapping +
distinct +
Weedy +, Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
tapering +
persistent +  and deciduous +
Salix fluviatilis var. exigua +  and Salix longifolia var. exigua +
Salix exigua +
Salix subg. Longifoliae +
species +
rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +