Difference between revisions of "Polygonum argyrocoleon"
Linnaea 20: 17. 1847.
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|common_names=Persian or silversheath knotweed | |common_names=Persian or silversheath knotweed | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=W | ||
| + | |label=Weedy | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=I | ||
| + | |label=Introduced | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms= | |synonyms= | ||
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|elevation=0-1200 m | |elevation=0-1200 m | ||
|distribution=Ariz.;Calif.;Colo.;Fla.;Idaho;La.;Mass.;Mo.;Nev.;N.Mex.;N.C.;Tex.;Utah;Vt.;W.Va.;c Asia. | |distribution=Ariz.;Calif.;Colo.;Fla.;Idaho;La.;Mass.;Mo.;Nev.;N.Mex.;N.C.;Tex.;Utah;Vt.;W.Va.;c Asia. | ||
| + | |introduced=true | ||
|tables= | |tables= | ||
|references= | |references= | ||
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|publication title=Linnaea | |publication title=Linnaea | ||
|publication year=1847 | |publication year=1847 | ||
| − | |special status= | + | |special status=Weedy;Introduced |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V5/V5_1144.xml |
|subfamily=Polygonaceae subfam. Polygonoideae | |subfamily=Polygonaceae subfam. Polygonoideae | ||
|genus=Polygonum | |genus=Polygonum | ||
Latest revision as of 22:08, 5 November 2020
Plants green, heterophyllous. Stems erect or decumbent, branched mostly from base, not wiry, 15–100 cm. Leaves: ocrea 4–8 mm, proximal part cylindric, distal part soon disintegrating into curly or straight fibers; petiole 0–1.5 mm; blade bluish green, lanceolate or linear-lanceolate, 15–50 × 2–8 mm, margins flat, apex acute; stem leaves 2.1–4 times as long as branch leaves; distal leaves abruptly reduced and not overtopping flowers (shorter than or equaling flowers). Inflorescence axillary and terminal, spikelike; cymes aggregated at tips of stems and branches, 4–6-flowered, bracts inconspicuous. Pedicels enclosed in ocreae, 1–2 mm. Flowers closed; perianth 1.8–2.4 mm; tube 10–22% of perianth length; tepals overlapping, green or white, usually with pink, rarely red or white, margins, petaloid, not keeled, oblong to obovate, cucullate; midveins usually unbranched; stamens 7–8. Achenes enclosed in perianth, brown, ovate, 3-gonous, 1.3–2.3 mm, faces subequal, slightly concave, apex not beaked, with concave edges, shiny, smooth; late-season achenes unknown.
Phenology: Flowering May–Oct.
Habitat: Fields, gardens, disturbed sites, often in saline soils
Elevation: 0-1200 m
Distribution
Introduced; Ariz., Calif., Colo., Fla., Idaho, La., Mass., Mo., Nev., N.Mex., N.C., Tex., Utah, Vt., W.Va., c Asia.
Discussion
Selected References
None.