Difference between revisions of "Polygonum tenue"
Fl. Bor.-Amer. 1: 238. 1803.
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|common_names=Slender or pleat-leaf knotweed | |common_names=Slender or pleat-leaf knotweed | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms= | |basionyms= | ||
|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Polygonum tenue var. protrusum | |name=Polygonum tenue var. protrusum | ||
|authority=Fernald | |authority=Fernald | ||
| + | |rank=variety | ||
}} | }} | ||
|hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Polygonum;Polygonum sect. Duravia;Polygonum tenue | |hierarchy=Polygonaceae;Polygonaceae subfam. Polygonoideae;Polygonum;Polygonum sect. Duravia;Polygonum tenue | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Polygonum tenue | name=Polygonum tenue | ||
| − | |||
|authority=Michaux | |authority=Michaux | ||
|rank=species | |rank=species | ||
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|publication title=Fl. Bor.-Amer. | |publication title=Fl. Bor.-Amer. | ||
|publication year=1803 | |publication year=1803 | ||
| − | |special status= | + | |special status=Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V5/V5_1159.xml |
|subfamily=Polygonaceae subfam. Polygonoideae | |subfamily=Polygonaceae subfam. Polygonoideae | ||
|genus=Polygonum | |genus=Polygonum | ||
Latest revision as of 22:08, 5 November 2020
Herbs. Stems erect, green or brown-ish, simple or branched from below middle, not wiry, 5–50 cm, glabrous or papillose-scabridulous. Leaves uniformly distributed, articulated to ocreae, basal leaves caducous or persistent, distal leaves abruptly reduced to bracts; ocrea 6–15 mm, glabrous or papillose-scabridulous, proximal part cylindric, distal part soon disintegrating into a few brown fibers; petiole 0.1–1 mm; blade 1-veined, with 1 pleat on each side of midrib, narrowly lanceolate to linear, 25–40 × 1–8 mm, margins usually flat, papillose-denticulate, apex mucronate or cuspidate. Inflorescences axillary and terminal, spikelike, slender, elongate; cymes spaced along branches, 1–2(–3)-flowered. Pedicels enclosed in ocreae, erect, 1–1.5 mm. Flowers closed; perianth 2.5–4.2 mm; tube 15–22% of perianth length; tepals overlapping, green, often brownish when dried, with pink or white margins, petaloid or sepaloid, elliptic, cucullate, navicular, apex rounded; midveins usually unbranched, rarely branched; stamens 8. Achenes enclosed in or slightly exserted from perianth, black, elliptic to oblong, 2.3–4 mm, faces subequal, shiny, smooth or minutely striate-tubercled near edges and apex. 2n = 20.
Phenology: Flowering Jun–Oct.
Habitat: Dry acid soils in exposed sites
Elevation: 100-1000 m
Distribution
Ont., Ala., Ark., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Mo., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., Wyo.
Discussion
Selected References
None.