Salix uva-ursi

Pursh

Fl. Amer. Sept. 2: 610. 1813.

Common names: Bearberry willow
IllustratedEndemic
Synonyms: Salix ivigtutiana Lundström Salix myrsinites var. parvifolia Lange
Treatment appears in FNA Volume 7. Treatment on page 73. Mentioned on page 60, 62, 68, 74.

Plants 0.01–0.05 m, (dwarf), forming clonal compact mats by layering. Stems prostrate, short-trailing; branches redbrown, gray-brown, or yellowbrown, glabrous; branchlets yellow-green or yellowbrown, glabrous or puberulent. Leaves: stipules (sometimes marcescent) absent, rudimentary, or foliaceous on early ones, foliaceous on late ones; petiole (shallowly to deeply grooved adaxially), 2–6.5 mm; largest medial blade (marcescent), amphistomatous or hypostomatous, ovate, broadly obovate, oblanceolate, or elliptic, 4–23 × 3.5–10 mm, 1.7–3.6 times as long as wide, base convex or cuneate, margins flat, serrulate or crenulate, apex convex, acuminate, acute, or retuse, abaxial surface glaucous, usually glabrous (rarely few hairs), adaxial slightly or highly glossy, usually glabrous (rarely a few hairs); proximal blade margins entire or serrate; juvenile blade glabrous, pilose, or puberulent abaxially. Catkins: staminate 9–19 × 5–8 mm, flowering branchlet 0.5–9 mm; pistillate densely flowered, slender to subglobose, 11–47 (–55 in fruit) × 6–10 mm, flowering branchlet 2–10 mm; floral bract brown, black, tawny, light rose, or bicolor, 1.1–1.8 mm, apex rounded or acute, entire, abaxially sparsely hairy, hairs straight or wavy. Staminate flowers: abaxial nectary absent, adaxial nectary narrowly oblong or oblong, 0.4–0.9 mm; filaments distinct, glabrous; stamens usually 1, rarely 2; anthers ellipsoid or shortly cylindrical, 0.4–0.7 mm. Pistillate flowers: abaxial nectary absent, adaxial nectary narrowly oblong or oblong, 0.5–0.8 mm, shorter to longer than stipe; stipe 0.3–1.6 mm; ovary ovoid or pyriform, glabrous, beak gradually tapering to styles; ovules 4–9 per ovary; styles 0.4–1 mm; stigmas flat, abaxially non-papillate with rounded tip, or slenderly cylindrical, 0.1–0.23–0.4 mm. Capsules 3–5 mm. 2n = 38.


Phenology: Flowering mid Jun-early Aug.
Habitat: Exposed, often dry or moist, calcareous, serpentine, dioritic, and granitic rocks, boulders, gravel, sand on beaches, outcrops, in snowbeds
Elevation: 10-1200 m

Distribution

V7 72-distribution-map.gif

Greenland, St. Pierre and Miquelon, Nfld. and Labr., N.S., Nunavut, Que., Maine, N.H., N.Y., Vt.

Discussion

Hybrids:

Salix uva-ursi forms natural hybrids with S. herbacea.

Selected References

None.

Lower Taxa

None.

"-0.4mm" is not declared as a valid unit of measurement for this property.

... more about "Salix uva-ursi"
glabrous +  and glaucous +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
red 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 />) +
Acute (?) +, Rounded (?) +, Retuse (?) +, Acuminate (?) +  and Convex (?) +
George W. Argus +
cuneate +  and convex +
Salix sect. Chamaetia +
tapering +
puberulent +, pilose +  and glabrous +
toothed +  and 2-fid +
persistent +
yellowbrown +, gray-brown +  and redbrown +
puberulent +  and glabrous +
subglobose +  and globose +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
flowered +, pistillate +  and staminate +
1.1 cm11 mm <br />0.011 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
pendulous +, spreading +  and erect +
subglobose +
slender +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Bearberry willow +
Greenland +, St. Pierre and Miquelon +, Nfld. and Labr. +, N.S. +, Nunavut +, Que. +, Maine +, N.H. +, N.Y. +  and Vt. +
10-1200 m +
bicolor +, light rose +, tawny +, black +  and brown +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
spherical +
Exposed, often dry or moist, calcareous, serpentine, dioritic, and granitic rocks, boulders, gravel, sand on beaches, outcrops, in snowbeds +
ferruginous +, gray +  and white +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
obovate +, oblong +, oblanceolate +, circular +, subcircular +  and elliptic +
hypostomatous +  and amphistomatous +
arranged +  and alternate +
marcescent +
deciduous +
4mm;23mm +
elliptic +, oblanceolate +, obovate +  and ovate +
0.2 cm2 mm <br />0.002 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (1 cm10 mm <br />0.01 m <br />) +
crenulate +, serrulate +  and flat +
2-7[-10]-carpellate +
pyriform +  and ovoid +
glandular-dotted +
flat;convex;flat;convex +
Flowering mid Jun-early Aug. +
Fl. Amer. Sept. +
overlapping +
distinct +
Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
short-trailing +
non-papillate +
cylindrical +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
caducous +  and persistent +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +  and deciduous +
ferruginous +  and white +
Salix ivigtutiana +  and Salix myrsinites var. parvifolia +
Salix uva-ursi +
Salix sect. Myrtosalix +
species +
rounded +
sympodial +, branching +  and heterophyllous +