Salix exigua var. hindsiana

(Bentham) Dorn

Brittonia 50: 203. 1998.

Common names: Hind’s willow
Basionyms: Salix hindsiana Bentham Pl. Hartw., 335. 1857
Synonyms: Salix exigua var. parishiana (Rowlee) Jepson Salix hindsiana var. leucodendroides (Rowlee) C. R. Ball Salix hindsiana var. parishiana (Rowlee) C. R. Ball Salix macrostachya var. leucodendroides Rowlee Salix parishiana Salix sessilifolia var. hindsiana (Bentham) Andersson ex Bebb Salix sessilifolia var. leucodendroides (Rowlee) C. K. Schneider
Treatment appears in FNA Volume 7. Treatment on page 56. Mentioned on page 52, 55.

Shrubs or trees, 1–5 (–17) m. Stems: branches gray-brown or redbrown, glabrous or hairy; branchlets yellowbrown or redbrown, pubescent or densely long-silky-villous, hairs spreading, appressed. Leaves: stipules rudimentary on early ones, foliaceous or rudimentary on late ones; petiole puberulent, villous, or short-silky adaxially; largest medial blade (sometimes hypostomatous) linear, 39–96 × 5.3–14 mm, 6.5–31 times as long as wide, abaxial surface glabrous or densely silky-villous to glabrescent, hairs appressed or spreading, straight, adaxial sparsely to very densely long-silky-villous; juvenile blade densely silky-villous abaxially (hairs relatively long, spreading, appressed). Catkins: staminate 7–42 × 4–9 mm, flowering branchlet 2–56 mm; pistillate densely or moderately densely flowered, slender to stout, 22–43 × 3–11 mm, flowering branchlet 2–55 mm; floral bract 1.4–2.6 mm, apex acute or convex, entire or erose, abaxially hairy throughout or proximally, hairs wavy, straight, or crinkled. Staminate flowers: abaxial nectary 0.5–0.9 mm, adaxial nectary narrowly oblong, square, or ovate, 0.4–1.1 mm; anthers 0.6–1.1 mm. Pistillate flowers: adaxial nectary oblong, ovate, or flask-shaped, 0.4–1.3 mm, longer than stipe; stipe 0–0.2 mm; ovary pyriform, pilose or villous to glabrescent, beak abruptly tapering to styles; ovules 12–24 per ovary; styles (± distinct) 0.2–0.5 mm; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical, 0.3–1 mm.


Phenology: Flowering mid Apr-mid May.
Habitat: Riparian, sandy-gravel floodplains
Elevation: 0-600 m

Discussion

Variety hindsiana often is not distinguished from var. exigua. The two are difficult to separate morphologically even though var. hindsiana has been shown to have highly diverged chloroplast DNA (S. J. Brunsfeld et al. 1992). It can be distinguished from var. exigua by its soft, spreading hairs on branchlets and juvenile leaves (S. Brunsfeld, pers. comm.).

Hybrids:

Variety hindsiana forms natural hybrids with var. exigua.

Selected References

None.

Lower Taxa

None.

0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
densely silky-villous +  and glabrescent +
flask--shaped +, ovate +, oblong +  and square +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
long-silky-villous +
reddish turning yellow +  and yellow +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
erose +  and entire +
Convex (?) +  and Acute (?) +
George W. Argus +
(Bentham) Dorn +
cuneate +
Salix hindsiana +
tapering +
yellowish green +
silky-villous +
toothed +  and 2-fid +
deciduous +
redbrown +  and gray-brown +
hairy +  and glabrous +
long-silky-villous +  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 />) +
flowered +, or +, pistillate +  and staminate +
2.2 cm22 mm <br />0.022 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
pendulous +, spreading +  and erect +
slender +  and stout +
0.3 cm3 mm <br />0.003 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Hind’s willow +
Calif. +  and Oreg. +
0-600 m +
0.14 cm1.4 mm <br />0.0014 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 />) +
Riparian, sandy-gravel floodplains +
straight +
spreading +  and appressed +
glabrate +  and hairy +
crinkled +  and wavy +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hypostomatous +  and amphistomatous +
3.9 cm39 mm <br />0.039 m <br /> (9.6 cm96 mm <br />0.096 m <br />) +
oblanceolate +, elliptic +, lorate +  and linear +
0.53 cm5.3 mm <br />0.0053 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
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 +  and glabrescent +
pyriform +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
glandular-dotted +
short-silky +, villous +  and puberulent +
flat;convex +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering mid Apr-mid May. +
overlapping +
distinct +
Weedy +, Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
tapering +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
persistent +  and deciduous +
Salix exigua var. parishiana +, Salix hindsiana var. leucodendroides +, Salix hindsiana var. parishiana +, Salix macrostachya var. leucodendroides +, Salix parishiana +, Salix sessilifolia var. hindsiana +  and Salix sessilifolia var. leucodendroides +
Salix exigua var. hindsiana +
Salix exigua +
variety +
pointed +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +