View source for Salix silicicola

{{Treatment/ID
|accepted_name=Salix silicicola
|accepted_authority=Raup
|publications={{Treatment/Publication
|title=J. Arnold Arbor.
|place=17: 236, plate 194. 1936
|year=1936
}}
|common_names=Blanket-leaf willow
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Salix alaxensis var. silicicola
|authority=(Raup) B. Boivin
}}
|hierarchy=Salicaceae;Salix;Salix subg. Vetrix;Salix sect. Villosae;Salix silicicola
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Salicaceae]]</div><div class="higher-taxon"><small>genus</small>[[Salix]]</div><div class="higher-taxon"><small>subgenus</small>[[Salix subg. Vetrix]]</div><div class="higher-taxon"><small>section</small>[[Salix sect. Villosae]]</div><div class="higher-taxon"><small>species</small>[[Salix silicicola]]</div></div>
|volume=Volume 7
|mention_page=page 25, 88, 98, 148
|treatment_page=page 147
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> 1–3 m, (forming clones by layering). <b>Stems</b>: branches yellow-brown, gray-brown, or red-brown, not glaucous, villous in patches to glabrescent; branchlets gray-brown or red-brown, very densely villous. <b>Leaves</b>: stipules foliaceous, apex acute to acuminate; petiole convex to flat adaxially, 5–12 mm, villous or tomentose adaxially, (strongly ventricose around floral buds); largest medial blade (apparently hypostomatous but surfaces obscured by hairs), narrowly oblong, narrowly elliptic, elliptic, or obovate, 36–84 × 19–40 mm, 1.8–3.6 times as long as wide, base convex or cuneate, margins slightly revolute, entire, apex convex or acuminate, abaxial surface very densely woolly-tomentose, hairs wavy, adaxial dull, moderately to very densely, villous-tomentose; proximal blade margins entire; juvenile blade color obscured by hairs, very densely tomentose-woolly abaxially, hairs white. <b>Catkins</b> flowering before leaves emerge; staminate stout, 40–56 × 14–15 mm, flowering branchlet 0 mm; pistillate densely flowered, slender, 35–125(–130 in fruit) mm, flowering branchlet 0 mm; floral bract brown or black, 2–3 mm, apex convex to rounded, abaxially hairy, hairs straight. <b>Staminate</b> flowers: adaxial nectary oblong to narrowly oblong, 0.6–1.5 mm; filaments distinct; anthers yellow, ellipsoid, 0.6–0.7 mm. <b>Pistillate</b> flowers: adaxial nectary oblong or obtriangular, 0.5–1.1 mm; stipe 0–0.3 mm; ovary pyriform, beak gradually tapering to styles; ovules 12–14 per ovary; styles 1.2–2.2 mm; stigmas 0.52–0.75–1 mm. <b>Capsules</b> 4–7 mm. <b>2n</b> = 38.</span><!--

-->{{Treatment/Body
|phenology=No data are available on flowering time in the wild; in cultivation flowering is early May.
|habitat=Active sand dunes
|elevation=20-500 m
|distribution=Nunavut;Sask.
|discussion=<p>Comparisons of genetic variation in <i>Salix alaxensis </i>var.<i> alaxensis</i> from British Columbia and <i>S. silicicola</i> from Lake Athabasca sand dunes, Saskatchewan, based on isozyme loci, fit predicted relationships between progenitor and derived taxon (B. G. Purdy and R. J. Bayer 1995). Allelic diversity of <i>S. silicicola</i> was a subset of that of <i>S. alaxensis</i>, there was less genetic variation in <i>S. silicicola</i> than in <i>S. alaxensis</i>, and interspecific genetic variation within the two species was similar and relatively very high. This suggested a recent origin for the derived <i>S. silicicola</i>.</p><!--
--><p><i>Salix silicicola</i> is a uniform population that differs from <i>S. alaxensis</i> in its very densely villous or tomentose leaves and branchlets. These characters seem to be an adaptation to reduce sand abrasion and water loss in a sand dune environment. It is unlikely that it would have evolved in situ but probably derived from a pre-adapted source such as the one represented by specimens of putative <i>S. silicicola</i> from Pelly Lake, Nunavut. The isozyme study did not include specimens from that population or of <i>S. alaxensis</i> from Northwest Territories from which <i>S. silicicola</i> is likely to have been derived. Occurrence of <i>S. silicicola</i>-like plants in northern continental Nunavut suggests that during the late Pleistocene, it had a wider range, which now is represented by two disjunct populations. The question of appropriate taxonomic rank for the derived taxon is still unresolved. Although <i>S. silicicola</i> is different from <i>S. alaxensis</i> in its general appearance, they are very similar genetically, and argument could be made for treating them as varieties (B. Boivin 1966b).</p><!--
--><p>Hybrids:</p><!--
--><p><i>Salix silicicola</i> forms natural hybrids with <i>S. brachycarpa </i>var.<i> psammophila</i>.</p><!--
--><p>of conservation concern</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Salix silicicola
|author=
|authority=Raup
|rank=species
|parent rank=section
|synonyms=Salix alaxensis var. silicicola
|basionyms=
|family=Salicaceae
|phenology=No data are available on flowering time in the wild; in cultivation flowering is early May.
|habitat=Active sand dunes
|elevation=20-500 m
|distribution=Nunavut;Sask.
|reference=None
|publication title=J. Arnold Arbor.
|publication year=1936
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V7/V7_166.xml
|genus=Salix
|subgenus=Salix subg. Vetrix
|section=Salix sect. Villosae
|species=Salix silicicola
}}<!--

-->[[Category:Treatment]][[Category:Salix sect. Villosae]]