Salix lasiolepis

Bentham

Pl. Hartw., 335. 1857.

Common names: Arroyo willow
WeedyIllustrated
Synonyms: Salix bakeri Seemen Salix bigelovii Torrey Salix franciscana Seemen Salix lasiolepis var. bracelinae C. R. Ball Salix lasiolepis var. sandbergii (Rydberg) C. R. Ball Salix lutea var. nivaria Jepson
Treatment appears in FNA Volume 7. Treatment on page 156. Mentioned on page 96, 128, 155, 157, 161.

Shrubs or trees, 1.5–10 m, (sometimes forming clones by stem fragmentation). Stems: branches (sometimes flexible to highly brittle at base), yellowbrown to redbrown, not or weakly glaucous, glabrous, tomentose, pubescent (appearing dusty); branchlets yellowish, yellowbrown, or redbrown, sparsely to densely villous, tomentose, or velvety to glabrescent, (inner membranaceous bud-scale layer free, separating from outer layer). Leaves: stipules usually foliaceous, or rudimentary or absent on early ones, foliaceous on late ones, apex acute; petiole convex to flat, or shallowly grooved adaxially, 3–16 mm, tomentose or velvety adaxially; largest medial blade lorate, narrowly oblong, narrowly elliptic, oblanceolate, or obovate to broadly obovate, 36–125 × 6–32 mm, 1.9–9.6 times as long as wide, base cuneate or convex, margins slightly to strongly revolute, entire or remotely or irregularly serrate, sinuate, (glands submarginal or epilaminal), apex acute, acuminate, convex or rounded, abaxial surface glaucous, sparsely pubescent, moderately densely tomentose or woolly-tomentose, short or long-silky to glabrescent, hairs (white, sometimes also ferruginous), wavy, adaxial slightly or highly glossy, moderately densely tomentose or short-silky to glabrescent, (hairs white, sometimes also ferruginous); proximal blade margins entire or serrulate; juvenile blade color sometimes obscured by hairs, silky, tomentose or very densely woolly-tomentose abaxially, hairs white, sometimes ferruginous. Catkins flowering before or just before leaves emerge; staminate slender or stout, 18–88 × 5–15 mm, flowering branchlet 0–5 mm; pistillate densely flowered, slender or stout, 18–72 × 7–12 mm, flowering branchlet 0–6 mm; floral bract 1–2.4 mm, apex broadly rounded, abaxially hairy, hairs straight or wavy. Staminate flowers: adaxial nectary narrowly oblong, oblong, or ovate, 0.5–1.2 mm; filaments distinct or connate less than 1/2 their lengths; anthers purple turning yellow, ellipsoid or shortly cylindrical, 0.4–0.7 mm. Pistillate flowers: adaxial nectary oblong to flask-shaped, 0.2–1.1 mm; stipe 1–1.7 mm; ovary pyriform, beak slightly bulged below styles; ovules 10–18 per ovary; styles (sometimes slightly distinct distally), 0.1–0.6 mm; stigmas flat, abaxially non-papillate with rounded or pointed tip, or 2 plump lobes, 0.1–0.3 mm. Capsules 2.5–5.5 mm. 2n = 76.


Phenology: Flowering mid Jan-mid Jun.
Habitat: Streamshores, marshes, meadows, springs, coastal headlands, rocky bluffs, sand dunes, salt marshes, silty, sandy, gravelly, or rocky substrates, dolomite
Elevation: 0-2800 m

Distribution

V7 180-distribution-map.gif

Ariz., Calif., Idaho, Nev., N.Mex., Oreg., Tex., Utah, Wash., Mexico (Baja California), Mexico (Chiapas), Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (San Luis Potosí), Mexico (Sonora)

Discussion

Salix lasiolepis is polymorphic. Variety bigelovii has been recognized in coastal California and Oregon (G. W. Argus 1993). It differs mainly in density of leaf indumentum and in having leaves tending to be slightly broader; it may be a coastal ecotype and is not formally recognized here.

Hybrids:

Salix lasiolepis forms natural hybrids with S. irrorata and S. breweri. Hybrids with S. hookeriana are suspected but unconfirmed. The distinctly serrate leaves in some specimens from Arizona and New Mexico may be part of the species variability, but could also be due to hybridization.

Selected References

None.

Lower Taxa

None.

... more about "Salix lasiolepis"
21 +, 4 +, 1 +, 16 +  and 29 +
long-silky to glabrescent +  and short +
woolly-tomentose +, tomentose +, pubescent +  and glaucous +
oblong +  and flask-shaped +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
short-silky;glabrescent +
purple turning yellow +
cylindrical +  and ellipsoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Rounded (?) +, Convex (?) +, Acuminate (?) +  and Acute (?) +
George W. Argus +
Bentham +
convex +  and cuneate +
Salix sect. Vetrix +
tapering +
ferruginous +  and white +
serrulate +  and entire +
woolly-tomentose +, tomentose +  and silky +
toothed +  and 2-fid +
persistent +
flowered +  and pistillate +
subglobose to globose +  and stout +
velvety +  and glabrescent +
stout +  and slender +
0 cm0 mm <br />0 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
intermediate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
pistillate +  and staminate +
pendulous +, spreading +  and erect +
staminate +
Arroyo willow +
Ariz. +, Calif. +, Idaho +, Nev. +, N.Mex. +, Oreg. +, Tex. +, Utah +, Wash. +, Mexico (Baja California) +, Mexico (Chiapas) +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (San Luis Potosí) +  and Mexico (Sonora) +
0-2800 m +
connate +  and distinct +
light rose +, bicolor +, tawny +, black +  and brown +
0.1 cm1 mm <br />0.001 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Streamshores, marshes, meadows, springs, coastal headlands, rocky bluffs, sand dunes, salt marshes, silty, sandy, gravelly, or rocky substrates, dolomite +
ferruginous +  and white +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
3.6 cm36 mm <br />0.036 m <br /> (12.5 cm125 mm <br />0.125 m <br />) +
obovate +  and broadly obovate +
0.6 cm6 mm <br />0.006 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
serrate +, remotely +  and entire +
rudimentary +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
velvety +  and tomentose +
convex;flat +
0.3 cm3 mm <br />0.003 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Flowering mid Jan-mid Jun. +
Pl. Hartw., +
overlapping +
distinct +
Weedy +  and Illustrated +
yellowbrown +  and redbrown +
decumbent;erect +
non-papillate +
cylindrical +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
caducous +  and persistent +
distinct +  and connate +
persistent +  and deciduous +
Salix bakeri +, Salix bigelovii +, Salix franciscana +, Salix lasiolepis var. bracelinae +, Salix lasiolepis var. sandbergii +  and Salix lutea var. nivaria +
Salix lasiolepis +
Salix sect. Mexicanae +
species +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +