Salix tweedyi

(Bebb ex Rose) C. R. Ball

Bot. Gaz. 40: 377. 1905.

Common names: Tweedy’s willow
IllustratedEndemic
Basionyms: Salix barrattiana var. tweedyi Bebb ex Rose Contr. U.S. Natl. Herb. 3: 572. 1896
Treatment appears in FNA Volume 7. Treatment on page 145. Mentioned on page 95.

Plants 1–3 m. Stems: branches redbrown, not glaucous, villous to glabrescent; branchlets yellowbrown, (sometimes strongly glaucous), pilose or moderately densely villous, (buds caprea or arctica-type, scale inner membranaceous layer free, separating from outer layer). Leaves: stipules (sometimes marcescent), foliaceous, 3.5–10–23 mm, 1–1.4–2.8 times as long as wide, usually lanceolate, ovate, or suborbiculate, (pleated when pressed), apex rounded, convex, or acute; petiole shallowly grooved adaxially, 3–11.3–26 mm, villous adaxially; largest medial blade elliptic to broadly elliptic, 36–65–100 × 17–35.5–85 mm, 1.1–1.9–2.9 times as long as wide, base convex, rounded, subcordate, or cordate, margins thickened, serrulate or spinulose-serrulate (sometimes teeth absent, margins with spherical glands), apex acuminate, acute, or convex, abaxial surface glaucous or not, pilose or villous, hairs curved, adaxial dull, pilose or villous to glabrescent; proximal blade margins entire (glands only) or serrulate; juvenile blade green, glabrous, pilose, or moderately densely villous abaxially, hairs white. Catkins flowering before leaves emerge; staminate stout, 39–56 × 14–22 mm, flowering branchlet 0–2 mm; pistillate densely flowered, stout, 39–70 (–110 in fruit) × 13–22 mm, flowering branchlet 0–2 mm; floral bract dark-brown, 1.8–4 mm, apex acute or rounded, abaxially sparsely hairy, hairs straight or wavy. Staminate flowers: adaxial nectary oblong, 0.6–1.2 mm; filaments distinct, glabrous or hairy basally; anthers yellow or purple turning yellow, 0.6–1 mm. Pistillate flowers: adaxial nectary oblong, narrowly oblong, or square, 0.5–1 mm, (unlobed), shorter to longer than stipe; stipe 0.4–1.5 mm; ovary pyriform, beak gradually tapering to styles; ovules 18–30 per ovary; styles 1.1–2.8 mm; stigmas slenderly cylindrical, 0.32–0.53–1 mm. Capsules 4–7 mm.


Phenology: Flowering Jul.
Habitat: Subalpine and alpine, streamsides and bottoms, lakeshores, marshes, spruce bogs, talus slopes, tundra, quartzite, granite, or, sometimes, limestone substrates
Elevation: 1400-4000 m

Distribution

V7 161-distribution-map.gif

B.C., Idaho, Mont., Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

"-100mm" is not declared as a valid unit of measurement for this property."-85mm" is not declared as a valid unit of measurement for this property."-23mm" is not declared as a valid unit of measurement for this property."-26mm" is not declared as a valid unit of measurement for this property."-1mm" is not declared as a valid unit of measurement for this property.

... more about "Salix tweedyi"
21 +, 4 +, 1 +, 16 +  and 29 +
114 +, 95 +, 76 +, 57 +  and 38 +
villous +, pilose +, not +  and glaucous +
square +  and oblong +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
villous;glabrescent +
purple turning yellow +  and yellow +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Rounded (?) +, Acute (?) +, Convex (?) +  and Acuminate (?) +
George W. Argus +
(Bebb ex Rose) C. R. Ball +
cordate +, subcordate +, rounded +  and convex +
Salix barrattiana var. tweedyi +
tapering +
ferruginous +  and white +
serrulate +  and entire +
villous +, pilose +  and glabrous +
toothed +  and 2-fid +
persistent +
villous +  and glabrescent +
flowered +  and pistillate +
villous +  and pilose +
slender +  and stout +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
intermediate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
pendulous +, spreading +  and erect +
Tweedy’s willow +
B.C. +, Idaho +, Mont. +, Wash. +  and Wyo. +
1400-4000 m +
hairy +  and glabrous +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Subalpine and alpine, streamsides and bottoms, lakeshores, marshes, spruce bogs, talus slopes, tundra, quartzite, granite, or, sometimes, limestone substrates +
straight +  and curved +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
elliptic +  and broadly elliptic +
oblong +  and narrowly broadly elliptic oblanceolate obovate or broadly obovate +
arranged +  and alternate +
marcescent +
deciduous +
1-1.4-2.8 +
suborbiculate +, ovate +  and lanceolate +
spinulose-serrulate +  and serrulate +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
usually convex;flat +
Flowering Jul. +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
persistent +  and deciduous +
Salix tweedyi +
Salix sect. Lanatae +
species +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +