Difference between revisions of "Carex williamsii"
Bull. New York Bot. Gard. 2: 159. 1901.
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|common_names=Carex de Williams | |common_names=Carex de Williams | ||
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+ | |code=F | ||
+ | |label=Illustrated | ||
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name=Carex williamsii | name=Carex williamsii | ||
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|authority=Britton | |authority=Britton | ||
|rank=species | |rank=species | ||
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|publication title=Bull. New York Bot. Gard. | |publication title=Bull. New York Bot. Gard. | ||
|publication year=1901 | |publication year=1901 | ||
− | |special status= | + | |special status=Illustrated |
− | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V23/V23_872.xml |
|genus=Carex | |genus=Carex | ||
|section=Carex sect. Chlorostachyae | |section=Carex sect. Chlorostachyae |
Latest revision as of 21:43, 5 November 2020
Culms to 15(–30) cm. Leaf blades filiform, channelled, 2–8 cm × 0.25–1 mm. Terminal spike androgynous or staminate, ± level with lateral spikes, 2–8 × 0.6–1 mm. Lateral spikes 2–5, usually suberect, 3–10-flowered, 4–10 × 2–2.5 mm. Pistillate scales pale brown with hyaline margins and paler midvein, ovate, 1.8–2.2 × 1–1.4 mm, apex obtuse. Staminate scales brown with hyaline margins and paler midvein, oblong-lanceolate, 2.5–3 × 0.8 mm, apex obtuse or mucronate. Perigynia 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. Achenes obovoid, 1.2–1.5 × 0.7 mm.
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
Á. Löve et al. (1957) reported a chromosome number of 2n = 18 for a North American plant of Carex williamsii; that number has not been confirmed. T. V. Egorova (1999) reported 2n = 46 for Asian plants of C. williamsii, which is within the range of chromosome counts reported for other species in sect. Chlorostachyae. It is not clear whether the terminal spike of C. williamsii 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.
Selected References
None.