Salix myrtillifolia

Andersson

Öfvers. Kongl. Vetensk.-Akad. Förh. 15: 132. 1858.

Common names: Low blueberry willow
IllustratedEndemic
Treatment appears in FNA Volume 7. Treatment on page 109. Mentioned on page 101, 102, 110, 111, 142.

Plants 0.1–0.6 (–1) m, (forming clones by layering). Stems (decumbent); branches gray-brown, redbrown, or yellowbrown, not to strongly glaucous (dull or slightly glossy), pubescent; branchlets gray-brown, redbrown, or yellowbrown, sparsely pubescent. Leaves: stipules rudimentary, foliaceous, or absent on early ones, foliaceous on late ones (0.2–1.8 (–5) mm); petiole deeply to shallowly grooved adaxially, 1.5–8 mm, glabrous or pubescent adaxially; largest medial blade (sometimes amphistomatous), elliptic, narrowly elliptic, obovate, or broadly obovate, 17–74 × 8–30 mm, 1.2–4.5 times as long as wide, base cuneate, convex, or subcordate, margins flat, serrulate, crenulate, or sinuate, apex acute, convex, or acuminate, abaxial surface not glaucous, glabrous, adaxial slightly glossy, glabrous; proximal blade margins crenate; juvenile blade reddish or yellowish green, glabrous. Catkins flowering as leaves emerge; staminate stout, 11.5–39 × 5–14 mm, flowering branchlet 0.5–6 mm; pistillate moderately densely flowered or densely flowered, slender or stout, 16–46 (–50 in fruit) × 4–15 mm, flowering branchlet 1.5–12 mm; floral bract brown, black, tawny, or bicolor, 0.4–1.1 mm, apex retuse or acute, abaxially hairy throughout or proximally, hairs curly or wavy. Staminate flowers: adaxial nectary oblong, ovate, or square, 0.2–0.34–0.4 mm; filaments distinct, glabrous; anthers purple turning yellow, 0.3–0.6 mm. Pistillate flowers: adaxial nectary square, oblong, or ovate, 0.2–0.4 mm, shorter than stipe; stipe 0.6–1.7 mm; ovary pyriform, glabrous, beak gradually tapering to or slightly bulged below styles; ovules (6–) 10–14 per ovary; styles connate or distinct 1/2 their lengths, 0.3–0.7 mm; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.16–0.23–0.32 mm. Capsules 4–6 mm. 2n = 38.


Phenology: Flowering early May-late Jul.
Habitat: Treed bogs, fens, stream banks, subalpine spruce thickets, Pinus contorta woods, sand dunes, coal spoils
Elevation: 90-2800 m

Distribution

V7 111-distribution-map.gif

Alta., B.C., Man., N.B., N.W.T., Nunavut, Ont., Sask., Yukon, Alaska, Colo., Wyo.

Discussion

Salix myrtillifolia occurs in Nunavut on Akimiski Island in James Bay.

The complex of species related to Salix myrtillifolia includes S. arizonica, S. ballii, S. boothii, and S. pseudomyrsinites. Two are diploid (S. arizonica and S. myrtillifolia), and two are tetraploid (S. boothii and S. pseudomyrsinites); the chromosome number of S. ballii is unknown. They have been treated taxonomically in different ways, but are relatively distinct in their morphology, ecology, and geography. Salix myrtillifolia has outlying populations represented by single collections each from Colorado, Quebec, and Wyoming. Specimens attributed to this species from the Gaspe Peninsula, Quebec, and the Northern Peninsula, Newfoundland, all have evidence of leaf glaucescence and are S. ballii. See 57. S. pseudomyrsinites and 58. S. ballii for more description.

Hybrids:

Salix myrtillifolia forms natural hybrids with S. candida.

Selected References

None.

Lower Taxa

None.

"-0.32mm" is not declared as a valid unit of measurement for this property.

... more about "Salix myrtillifolia"
21 +, 4 +, 1 +, 16 +  and 29 +
glabrous +  and not glaucous +
ovate +, oblong +  and square +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
purple turning yellow +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Acute (?) +, Retuse (?) +, Acuminate (?) +  and Convex (?) +
intermediate +
George W. Argus +
Andersson +
subcordate +, convex +  and cuneate +
Salix tribe Hastatae +
tapering +
yellowish green +  and reddish +
ferruginous +  and white +
toothed +  and 2-fid +
persistent +
yellowbrown +, redbrown +  and gray-brown +
pubescent +  and glaucous +
flowered +  and pistillate +
stout +  and slender +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
intermediate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
pendulous +, spreading +  and erect +
Low blueberry willow +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, Nunavut +, Ont. +, Sask. +, Yukon +, Alaska +, Colo. +  and Wyo. +
90-2800 m +
bicolor +, tawny +, black +  and brown +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
Treed bogs, fens, stream banks, subalpine spruce thickets, Pinus contorta woods, sand dunes, coal spoils +
gray +, ferruginous +  and white +
wavy +  and curly +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
oblong +  and narrowly broadly elliptic oblanceolate obovate or broadly obovate +
arranged +  and alternate +
marcescent +
deciduous +
17mm;74mm +
obovate +  and elliptic +
0.8 cm8 mm <br />0.008 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sinuate +, crenulate +, serrulate +  and flat +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
pubescent +  and glabrous +
usually convex;flat +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering early May-late Jul. +
Öfvers. Kongl. Vetensk.-Akad. Förh. +
overlapping +
distinct +
Illustrated +  and Endemic +
decumbent;erect +
non-papillate +
cylindrical +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
persistent +  and deciduous +
Salix subsect. Hastatae +
Salix myrtillifolia +
Salix sect. Hastatae +
species +
rounded +
sympodial +, branching +  and heterophyllous +