Salix cascadensis

Cockerell

Muhlenbergia 3: 9. 1907.

Common names: Cascade willow
IllustratedEndemic
Basionyms: Salix tenera Andersson in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 16(2): 288. 1868,
Synonyms: Salix cascadensis var. thompsonii Brayshaw
Treatment appears in FNA Volume 7. Treatment on page 82. Mentioned on page 63, 83, 114, 115.

Plants 0.03–0.1 m, forming clones by rhizomes. Stems erect or trailing; branches yellowbrown or gray-brown, (sometimes weakly glaucous), glabrous; branchlets yellow-green or yellowbrown, glabrous or puberulent. Leaves (marcescent); stipules absent; petiole 1.5–5 mm; largest medial blade usually amphistomatous, narrowly elliptic or elliptic, 9–26 × 3.8–7.5 mm, 2.4–4.3 times as long as wide, base cuneate, margins flat, entire, ciliate, apex acute, acuminate, or convex, abaxial surface glabrous or pilose, hairs wavy, adaxial slightly glossy, glabrous or pilose; proximal blade margins entire; juvenile blade glabrous or sparsely villous abaxially. Catkins: staminate (20–50 flowers), 12.5–26.5 × 5.5–9 mm, flowering branchlet 1–11 mm; pistillate moderately densely to loosely flowered, (15–35 (–43) flowers), stout or subglobose, 10–23 (–30 in fruit) × 5–8 mm, flowering branchlet 2–9 mm; floral bract brown, 1.6–2.6 mm, apex rounded, entire, abaxially sparsely hairy or ciliate, hairs wavy or straight. Staminate flowers: abaxial nectary (0–) 0.2–0.6 mm, adaxial nectary oblong or square, 0.4–1.2 mm, nectaries distinct; filaments distinct or basally connate; anthers ellipsoid, 0.3–0.6 mm. Pistillate flowers: adaxial nectary oblong or square, 0.5–1.2 mm, longer than stipe; stipe 0–0.6 m; ovary pyriform, usually densely villous, beak abruptly tapering to or slightly bulged below styles; ovules 6–10 per ovary; styles 0.3–1 mm; stigmas slenderly cylindrical, 0.28–0.39–0.56 mm. Capsules 3.5–5 mm.


Phenology: Flowering early Jul-early Aug.
Habitat: Mesic to dry rocky slopes, ridges, high subalpine and alpine tundra
Elevation: 2200-3900 m

Distribution

V7 86-distribution-map.gif

B.C., Colo., Utah, Wash., Wyo.

Discussion

The morphological variability of Salix cascadensis is not well understood. Typically, it has leaves that are narrow, sharply pointed, and glaucous abaxially, catkins 15–43-flowered, dark brown floral bracts, and ovaries very densely hairy. Specimens with leaves not glaucous abaxially, catkins relatively few-flowered, and ovaries either sparsely hairy throughout, hairy only on beaks, or hairy in streaks, may be hybrids but the glabrous ovaried S. cascadensis var. thompsonii shows no obvious signs of hybridization.

Hybrids:

Salix cascadensis is suspected to hybridize with S. barclayi.

Salix cascadensis × S. rotundifolia var. dodgeana resembles the former in its narrow, acute to acuminate leaves and the latter in leaves not glaucous abaxially, tawny floral bracts, relatively short catkins, and glabrous ovaries. The catkins are intermediate in being 6–7-flowered.

Selected References

None.

Lower Taxa

None.

"-0.56mm" is not declared as a valid unit of measurement for this property.

... more about "Salix cascadensis"
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
pilose +  and glabrous +
square +  and oblong +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
red turning yellow +
ellipsoid +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Rounded (?) +, Convex (?) +, Acuminate (?) +  and Acute (?) +
George W. Argus +
Cockerell +
cuneate +
Salix tenera +
tapering +
villous +  and glabrous +
toothed +  and 2-fid +
persistent +
gray-brown +  and yellowbrown +
puberulent +  and glabrous +
subglobose +  and globose +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
flowered +, pistillate +  and staminate +
1.25 cm12.5 mm <br />0.0125 m <br /> (2.65 cm26.5 mm <br />0.0265 m <br />) +
pendulous +, spreading +  and erect +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Cascade willow +
B.C. +, Colo. +, Utah +, Wash. +  and Wyo. +
2200-3900 m +
connate +  and distinct +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
pistillate +  and staminate +
1 cm10 mm <br />0.01 m <br /> (2.3 cm23 mm <br />0.023 m <br />) +
bisexual +  and unisexual +
spherical +
Mesic to dry rocky slopes, ridges, high subalpine and alpine tundra +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
0.9 cm9 mm <br />0.009 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
obovate +, oblong +, oblanceolate +, circular +, subcircular +  and elliptic +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
flat;convex;flat;convex +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering early Jul-early Aug. +
Muhlenbergia +
overlapping +
distinct +
Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
trailing;erect +
non-papillate +
cylindrical +
0 cm0 mm <br />0 m <br /> (60 cm600 mm <br />0.6 m <br />) +
caducous +  and persistent +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +  and deciduous +
ferruginous +  and white +
Salix cascadensis var. thompsonii +
Salix cascadensis +
Salix sect. Diplodictyae +
species +
rounded +
sympodial +, branching +  and heterophyllous +