Difference between revisions of "Polygonella americana"
Mem. Torrey Bot. Club 5: 141. 1894.
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|common_names=American jointweed;southern jointweed | |common_names=American jointweed;southern jointweed | ||
| + | |special_status={{Treatment/ID/Special_status | ||
| + | |code=F | ||
| + | |label=Illustrated | ||
| + | }}{{Treatment/ID/Special_status | ||
| + | |code=E | ||
| + | |label=Endemic | ||
| + | }} | ||
|basionyms={{Treatment/ID/Basionym | |basionyms={{Treatment/ID/Basionym | ||
|name=Gonopyrum americanum | |name=Gonopyrum americanum | ||
|authority=Fischer & C. A. Meyer | |authority=Fischer & C. A. Meyer | ||
| + | |rank=species | ||
|publication_title=Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. | |publication_title=Mém. Acad. Imp. Sci. Saint-Pétersbourg, Sér. | ||
|publication_place=6, Sci. Math., Seconde Pt. Sci. Nat. 4: 144. 1840 | |publication_place=6, Sci. Math., Seconde Pt. Sci. Nat. 4: 144. 1840 | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Polygonella americana | name=Polygonella americana | ||
| − | |||
|authority=(Fischer & C. A. Meyer) Small | |authority=(Fischer & C. A. Meyer) Small | ||
|rank=species | |rank=species | ||
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|publication title=Mem. Torrey Bot. Club | |publication title=Mem. Torrey Bot. Club | ||
|publication year=1894 | |publication year=1894 | ||
| − | |special status= | + | |special status=Illustrated;Endemic |
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V5/V5_1105.xml |
|subfamily=Polygonaceae subfam. Polygonoideae | |subfamily=Polygonaceae subfam. Polygonoideae | ||
|genus=Polygonella | |genus=Polygonella | ||
Latest revision as of 22:08, 5 November 2020
Subshrubs, perennial, synoecious, 5.5–9 dm. Stems erect, branched proximally and basally, glabrous. Leaves persistent; ocrea margins not ciliate; blade linear to spatulate, (4–)5–12(–19) × 0.5–0.9(–1.2) mm, base barely tapered, margins not hyaline, apex obtuse to acute, often erose, glabrous. Inflorescences (7–)18–30(–60) mm; ocreola encircling rachis, only the base adnate to rachis, apex acuminate. Pedicels spreading in anthesis and fruit, 0.4–2.3 mm, usually much longer than subtending ocreola. Flowers bisexual; outer tepals sharply reflexed early in anthesis and in fruit, white to pink, elliptic to ovate, 1.2–2.2 mm in anthesis, margins erose; inner tepals loosely appressed in anthesis and fruit, white to pink, ovate to suborbiculate, 1.7–2.9 mm in anthesis, margins erose; filaments dimorphic; anthers yellow or pink; styles and stigmas 0.5–1 mm in anthesis. Achenes included, reddish brown, 3(–4)-gonous, 2.5–4 × 1.3–2.3 mm, shiny, smooth. 2n = 36.
Phenology: Flowering Jun–Oct.
Habitat: Sandy roadsides, fields, riverbanks, scrub forests, waste places
Elevation: 10-200 m
Distribution
Ala., Ark., Ga., La., Mo., N.Mex., Okla., S.C., Tex.
Discussion
Selected References
None.