Salix pedicellaris
 
Bog Willow

Leaf Top Close-Up

3.1 Miles North of Highway #3 on Silica Sands Road, East of Hudson Bay
16-June-2017

Note the surface of the leaf is covered with a whitish bloom.

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Pedicellaris: Answers to key questions in Conifers & Catkin-Bearing Trees and Shrubs of Saskatchewan, Fascicle 5, Flora of Saskatchewan by Anna Leighton leading to this species. The answers are in the order you would normally work through the key
bulletCatkins usually flowering as leaves emerge, sometimes just before leaves emerge or throughout the season, subtended by small green leaves of the flowering branchlet that supports them.  NOT  [Catkins usually flowering before leaves emerge, borne directly on bare branches (sessile) and subtended by 1 - 3 short, greenish or brownish, caducous bract-like leaves]
bulletLow to tall shrubs or trees; not confined to subarctic regions.  NOT [Dwarf shrubs <= 0.15 m (15 cm) tall; subarctic regions]
bulletShrubs, usually with several stems; ovaries glabrous or hairy.   NOT  [Trees, with a single trunk, or with several trunks of tree stature; ovaries glabrous]
bulletNOT [Plants flowering as leaves emerge or throughout the season, often bearing branched catkins; leaf blades linear or strap-shaped, 9 – 14 – 24 times longer than wide, up to 11 mm wide with margins remotely spinulose-serrulate, the teeth widely spaced; hairs on leaves white, ferruginous hairs lacking; plants forming extensive colonies by root shoots]
bulletPetioles without glandular dots or lobes at distal end, or with occasional, inconspicuous dots; floral bracts not as above, if conspicuous and pale, then not deciduous.  NOT [Petioles with glandular dots or lobes at distal end; floral bracts pale tawny, 1.2 – 4 mm, conspicuous during flowering, deciduous after flowering]
bulletOvaries glabrous. NOT [Ovaries hairy].
bulletLower surfaces of leaf blades glaucous, sometimes obscured by dense hairs. NOT [Lower surfaces of leaf blades not glaucous, usually glabrous but sometimes hairy.]
bulletCatkins stout to subglobose, 11 - 32 mm; styles immeasurably short (0.1  - 0.24 mm); ovaries often reddish; leaf blade upper surfaces glaucous, margins entire; plants to 2 m tall. NOT [Catkins slender or stout, 16 - 85 mm; styles usually measurable (0.2 – 0.6 mm); ovaries rarely reddish; leaf blade upper surfaces not glaucous, margins toothed or sinuate; plants to 7 m tall.]

 
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Salix: Answers to key questions in Conifers & Catkin-Bearing Trees and Shrubs of Saskatchewan, Fascicle 5, Flora of Saskatchewan by Anna Leighton leading to this genus
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shrubs or trees; NOT [trees]

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buds covered by 1 scale; NOT  [buds covered by 3-10 scales]

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buds scale not resinous; NOT [bud scale usually resinous]

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catkins sessile or terminating flowering branchlets; NOT [catkins sessile]

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catkins erect, spreading, or +/- pendulous; NOT [catkins pendulous]

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floral bracts entire, erose, bifid, or irregularly toothed; NOT [floral bracts deeply cut]

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perianth reduced to an adaxial nectary (rarely also an abaxial nectary, then the 2 nectaries distinct or connate into a shallow cup); NOT [perianth reduced to a non-nectariferous, cup-shaped or shallow saucer-shaped floral disc]

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stamens 1, 2, or 3 – 10; NOT [stamens 6 – 60 (70)]

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capsules obclavate to ovoid or ellipsoid; NOT [capsules narrowly ovoid to spherical, with the floral disc persistent at base]

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capsules 2-valved; NOT [capsules 2 - 4 valved]

 

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Salicaceae: Answers to key questions in Budd's Flora  leading to this family. 
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shrubs or trees; NOT [herbs]

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flowers with only one floral ring, with sepals but not petals

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male flowers, at least, in catkins or aments; NOT [flowers not in catkins or aments]

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seeds each with a tuft of hairs; NOT [seeds without a tuft of hairs]