Salix thurberi

Rowlee

Bull. Torrey Bot. Club 27: 252. 1900.

Common names: Thurber’s willow
Synonyms: Salix exigua var. angustissima (Andersson) Reveal & C. R. Broome Salix interior var. angustissima (Andersson) Dayton Salix longifolia var. angustissima Andersson
Treatment appears in FNA Volume 7. Treatment on page 58. Mentioned on page 51, 52, 53, 54.

Shrubs or trees, 4–10 m. Stems: branches redbrown, glabrous or glabrescent; branchlets yellow-green, redbrown, or violet, tomentose or pubescent to glabrescent. Leaves: stipules absent or rudimentary; petiole 0–4 (–8) mm, pubescent or short-silky adaxially; largest medial blade linear, 66–95 (–140) × 2–16 mm, 11–35 times as long as wide, base cuneate, margins flat, remotely spinulose-serrulate, apex acute to subacuminate, abaxial surface very thinly glaucous, sparsely short-silky (especially along midrib), to glabrescent, adaxial slightly glossy, short-silky, pilose to glabrescent; proximal blade margins entire; juvenile blade reddish or yellowish green, moderately densely to sparsely long-silky to glabrescent abaxially. Catkins: staminate 8–35 × 6 mm, flowering branchlet 3–55 mm; pistillate loosely flowered, slender, 15–40 (–50) × 3.2–8 mm, flowering branchlet 7–28 mm; floral bract 2–4 mm, apex acute or acuminate, entire, abaxially hairy, hairs wavy. Staminate flowers: abaxial nectary absent, adaxial nectary ovate, narrowly oblong, or flask-shaped, 0.6–1.4 mm; filament hairy; anthers 0.3–0.8 mm. Pistillate flowers: adaxial nectary narrowly oblong to ovate, 0.4–0.7 mm, shorter to longer than stipe; stipe 0–0.8 mm; ovary obclavate to pyriform, densely long-silky or villous, beak abruptly tapering to styles; ovules 16–36 per ovary; styles 0–0.2 mm; stigmas flat, abaxially non-papillate with rounded tip, or broadly cylindrical, 0.3–0.7 mm. Capsules (2.5–) 4–7 mm.


Phenology: Flowering Mar–Dec.
Habitat: Sandy to silty floodplains, disturbed areas
Elevation: 0-1600 m

Distribution

V7 50-distribution-map.gif

Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Hidalgo), Mexico (Nuevo León), Mexico (Tamaulipas), Mexico (Veracruz)

Discussion

The description above is based on specimens supplemented by published descriptions (W. W. Rowlee 1900; C. R. Ball 1961; R. D. Dorn 1998). Ball noted that aside from some characters, Salix thurberi is similar to S. interior. Ball’s and Dorn’s concepts of the species were not the same because Ball gave the Texas distribution as Brewster, Cameron, El Paso, Guadalupe, Hidalgo, Jeff Davis, Matagorda, Starr, and Val Verde counties, but Dorn recognized it only in Pecos and Val Verde counties.

Selected References

None.

Lower Taxa

None.

... more about "Salix thurberi"
sparsely short-silky +  and glabrescent +
narrowly oblong +  and ovate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
pilose;glabrescent +
reddish turning yellow +  and yellow +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
George W. Argus +
Rowlee +
cuneate +
Longifoliae +
tapering +
yellowish green +  and reddish +
long-silky +  and glabrescent +
toothed +  and 2-fid +
deciduous +
glabrescent +  and glabrous +
pubescent +  and glabrescent +
stout +  and slender +
0.7 cm7 mm <br />0.007 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
flowered +, pistillate +  and staminate +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (4 cm40 mm <br />0.04 m <br />) +
pendulous +, spreading +  and erect +
slender +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Thurber’s willow +
Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Hidalgo) +, Mexico (Nuevo León) +, Mexico (Tamaulipas) +  and Mexico (Veracruz) +
0-1600 m +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Sandy to silty floodplains, disturbed areas +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hypostomatous +  and amphistomatous +
9.5 cm95 mm <br />0.095 m <br /> (14 cm140 mm <br />0.14 m <br />) +
6.6 cm66 mm <br />0.066 m <br /> (9.5 cm95 mm <br />0.095 m <br />) +
oblanceolate +, elliptic +, lorate +  and linear +
0.2 cm2 mm <br />0.002 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
spinulose-serrulate +
2-7[-10]-carpellate +
villous +  and long-silky +
obclavate +  and pyriform +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
glandular-dotted +
short-silky +  and pubescent +
flat;convex +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering Mar–Dec. +
Bull. Torrey Bot. Club +
overlapping +
distinct +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
0 cm0 mm <br />0 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
persistent +  and deciduous +
Salix exigua var. angustissima +, Salix interior var. angustissima +  and Salix longifolia var. angustissima +
Salix thurberi +
Salix subg. Longifoliae +
species +
rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +