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, Russian Far East, Wrangel Island).

Discussion

Selected References

None.

Lower Taxa

None.
George W. Argus +
Trautvetter +
Salix sect. Chamaetia +
Round-leaf or least willow +
N.W.T. +, Yukon +, Alaska +, e Asia (Chukotka +, Russian Far East +  and Wrangel Island). +
0-2200 m +
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 +
Flowering Jul-early Aug. +
Nouv. Mém. Soc. Imp. Naturalistes Moscou +
Salix leiocarpa +  and Salix polaris var. leiocarpa +
Salix rotundifolia var. rotundifolia +
Salix rotundifolia +
variety +