Salix rotundifolia var. rotundifolia

Common names: Round-leaf or least willow
Synonyms: Salix leiocarpa (Chamisso) Coville Salix polaris var. leiocarpa
Treatment appears in FNA Volume 7. Treatment on page 70.

Plants 0.01–0.05 m. Leaves: petiole 0.5–2–4.6 (–5.5) mm; largest medial blade 4.5–8–16.3 × 3–5.9–10.5 mm, 0.92–1.23–2.27 (–2.53) times as long as wide. Catkins: staminate subglobose or stout, 9.5–18.5 × 5–12 mm, flowering branchlet 1–9 mm; pistillate: (3–) 4–7–15 flowers, stout, subglobose, or globose, 13–35 × 6–17 mm, flowering branchlet 2–22 mm; floral bract hairs usually wavy, some straight, curly, or crinkled, exceeding bract by 0.32–0.71–1.25 (–2.4) mm. Staminate flowers: abaxial nectary 0.5–0.6 mm. Pistillate flowers: abaxial nectary present or absent, oblong or narrowly oblong, 0.9–2 mm; stigmas slenderly or broadly cylindrical, 0.36–0.47–0.6 mm. Capsules 4–8.3 mm. 2n = 114.


Phenology: Flowering Jul-early Aug.
Habitat: Arctic-alpine, Dryas tundra and willow thickets along streams, sedge-grass tundra, sandy, saline coastal flats, beach cobbles, Empetrum-lichen heath on wet slopes, upland shrubby tundra, polygonal tundra and raised center polygons, snowbeds, scree and colluvial slopes, substrates from clay to coarse rubble, both calcareous limestone and acidic
Elevation: 0-2200 m

Distribution

V7 66-distribution-map.gif

N.W.T., Yukon, Alaska, e Asia (Chukotka), e Asia (Russian Far East), e Asia (Wrangel Island)

Discussion

Selected References

None.

Lower Taxa

None.

"-16.3mm" is not declared as a valid unit of measurement for this property."-10.5mm" is not declared as a valid unit of measurement for this property."-4.6mm" is not declared as a valid unit of measurement for this property."-4.6mm" is not declared as a valid unit of measurement for this property."-0.6mm" is not declared as a valid unit of measurement for this property.

connate +  and distinct +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
flask--shaped +  and oblong +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
red turning yellow +
globose +  and ellipsoid +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
Retuse (?) +, Rounded (?) +, Acute (?) +  and Convex (?) +
George W. Argus +
Trautvetter +
convex +  and rounded +
Salix sect. Chamaetia +
tapering +
puberulent +  and glabrous +
toothed +  and 2-fid +
persistent +
crinkled +, curly +  and wavy +
gray-brown +, yellowbrown +  and yellow-green +
glaucous +  and glabrous +
flowered +  and pistillate +
glaucous +  and glabrous +
globose +  and subglobose +
0.2 cm2 mm <br />0.002 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.83 cm8.3 mm <br />0.0083 m <br />) +
0.95 cm9.5 mm <br />0.0095 m <br /> (1.85 cm18.5 mm <br />0.0185 m <br />) +
pendulous +, spreading +  and erect +
subglobose +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Round-leaf or least willow +
N.W.T. +, Yukon +, Alaska +, e Asia (Chukotka) +, e Asia (Russian Far East) +  and e Asia (Wrangel Island) +
0-2200 m +
connate +  and distinct +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
pistillate +  and staminate +
1.3 cm13 mm <br />0.013 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
bisexual +  and unisexual +
6mm;17mm +
spherical +
Arctic-alpine, Dryas tundra and willow thiArctic-alpine, Dryas tundra and willow thickets along streams, sedge-grass tundra, sandy, saline coastal flats, beach cobbles, Empetrum-lichen heath on wet slopes, upland shrubby tundra, polygonal tundra and raised center polygons, snowbeds, scree and colluvial slopes, substrates from clay to coarse rubble, both calcareous limestone and acidicbble, both calcareous limestone and acidic +
ferruginous +  and white +
straight +
curly +, crinkled +  and wavy +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
0.92-1.23-2.27(-2.53) +
circular +, subcircular +  and elliptic +
arranged +  and alternate +
marcescent +
deciduous +
2-7[-10]-carpellate +
puberulent +  and glabrous +
pyriform +
glandular-dotted +
flat;convex;flat;convex +
Flowering Jul-early Aug. +
Nouv. Mém. Soc. Imp. Naturalistes Moscou +
overlapping +
distinct +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
persistent +  and deciduous +
ferruginous +  and white +
Salix leiocarpa +  and Salix polaris var. leiocarpa +
Salix rotundifolia var. rotundifolia +
Salix rotundifolia +
variety +
pointed +
sympodial +, branching +  and heterophyllous +