View source for Carex williamsii

{{Treatment/ID
|accepted_name=Carex williamsii
|accepted_authority=Britton
|publications={{Treatment/Publication
|title=Bull. New York Bot. Gard.
|place=2: 159. 1901
|year=1901
}}
|common_names=Carex de Williams
|basionyms=
|synonyms=
|hierarchy=Cyperaceae;Carex;Carex sect. Chlorostachyae;Carex williamsii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Cyperaceae]]</div><div class="higher-taxon"><small>genus</small>[[Carex]]</div><div class="higher-taxon"><small>section</small>[[Carex sect. Chlorostachyae]]</div><div class="higher-taxon"><small>species</small>[[Carex williamsii]]</div></div>
|volume=Volume 23
|mention_page=page 473, 476
|treatment_page=page 475
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Culms </b>to 15(–30) cm. <b>Leaf</b> blades filiform, channelled, 2–8 cm × 0.25–1 mm. <b>Terminal</b> spike androgynous or staminate, ± level with lateral spikes, 2–8 × 0.6–1 mm. <b>Lateral</b> spikes 2–5, usually suberect, 3–10-flowered, 4–10 × 2–2.5 mm. <b>Pistillate</b> scales pale brown with hyaline margins and paler midvein, ovate, 1.8–2.2 × 1–1.4 mm, apex obtuse. <b>Staminate</b> scales brown with hyaline margins and paler midvein, oblong-lanceolate, 2.5–3 × 0.8 mm, apex obtuse or mucronate. <b>Perigynia</b> distinctly veined, lanceolate, 2.3–3.1 × 0.7–1 mm; beak 0.5–1 mm, margins entire or with 1 or 2 basal setae. <b>Achenes</b> obovoid, 1.2–1.5 × 0.7 mm.</span><!--

-->{{Treatment/Body
|phenology=Fruiting summer.
|habitat=Fens, sedge meadows, moist tundra
|elevation=0–500 m
|distribution=Man.;Nfld. and Labr.;N.W.T.;Nunavut;Ont.;Que.;Yukon;Alaska;n Asia.
|discussion=<p>Á. Löve et al. (1957) reported a chromosome number of 2n = 18 for a North American plant of <i>Carex williamsii</i>; that number has not been confirmed. T. V. Egorova (1999) reported 2n = 46 for Asian plants of <i>C. williamsii</i>, which is within the range of chromosome counts reported for other species in sect. Chlorostachyae. It is not clear whether the terminal spike of <i>C. williamsii</i> is consistently androgynous or whether it can also be staminate. Androgynous spikes have only 1–3 perigynia that are usually hidden by the lateral spikes.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Carex williamsii
|authority=Britton
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Cyperaceae
|phenology=Fruiting summer.
|habitat=Fens, sedge meadows, moist tundra
|elevation=0–500 m
|distribution=Man.;Nfld. and Labr.;N.W.T.;Nunavut;Ont.;Que.;Yukon;Alaska;n Asia.
|reference=None
|publication title=Bull. New York Bot. Gard.
|publication year=1901
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V23/V23_872.xml
|genus=Carex
|section=Carex sect. Chlorostachyae
|species=Carex williamsii
}}<!--

-->[[Category:Treatment]][[Category:Carex sect. Chlorostachyae]]