Edit History
Polygonum ramosissimum Michaux subsp. ramosissimum [family POLYGONACEAE]
Date Updated: 23 July 2012
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 5,
Names
Polygonum ramosissimum Michaux subsp. ramosissimum [family POLYGONACEAE]
Polygonum atlanticum (B. L. Robinson) E. P. Bicknell [family POLYGONACEAE]
Polygonum exsertum Small [family POLYGONACEAE]
Polygonum interior Brenckle [family POLYGONACEAE]
Polygonum latum Small ex Rydberg [family POLYGONACEAE]
Polygonum leptocarpum B. L. Robinson [family POLYGONACEAE]
Polygonum stevensii Brenckle [family POLYGONACEAE]
Polygonum triangulum E. P. Bicknell [family POLYGONACEAE]
Treatment Author(s)
Mihai Costea
François J. Tardif
Harold R. Hinds†
Information
Plants usually yellowish greenish when fresh or dried, hetero-phyllous. Stems 30–200 cm. Leaf blades light yellowish green, narrowly elliptic to lanceolate, rarely ovate, 35–70 × 7–18(–35) mm, apex acute to acuminate; stem leaves 2.1–3.5(–4.2) times as long as branch leaves; distal leaves usually 1–2 mm, not overtopping flowers, or 5–15 mm, surpassing flowers. Inflorescences axillary and terminal, spikelike; cymes crowded toward tips of branches, 2–5-flowered. Pedicels exserted from ocreae, 2.5–6 mm. Flowers: perianth (2.6–)3–4 mm; tepal margins greenish yellow or yellow, rarely white or pink; stamens 3–6(–8). Achenes enclosed in or exserted from perianth, (2.3–)2.5–3.5 mm, shiny or dull, smooth to roughened, sometimes uniformly or obscurely tubercled; late-season achenes 5–12 mm. 2n = 60.
Phenology
jul-aug (summer), sep-oct (fall)
Altitude range
0–1000 m;
Distribution
USA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Mass.USA Mich.USA Minn.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada N.W.T.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
Subspecies ramosissimum is heterogeneous; some additional elements may deserve recognition. It is closely related to European Polygonum bellardii Allioni, which was collected in south Boston in 1785 (B. L. Robinson 1902). The latter species has semi-open flowers, petaloid tepals with white or pink margins, and eight stamens. A distinct form of P. ramosissimum growing in saline marshes from California has been mistakenly identified as P. patulum Bieberstein (M. Costea and F. J. Tardif 2003b). The morphology of late-season achenes and the branching patterns, which have been emphasized by some authors, appear to have little taxonomic value.
Date Updated: 23 July 2012
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 5,
Names
Polygonum ramosissimum Michaux subsp. ramosissimum [family POLYGONACEAE]
Polygonum atlanticum (B. L. Robinson) E. P. Bicknell [family POLYGONACEAE]
Polygonum exsertum Small [family POLYGONACEAE]
Polygonum interior Brenckle [family POLYGONACEAE]
Polygonum latum Small ex Rydberg [family POLYGONACEAE]
Polygonum leptocarpum B. L. Robinson [family POLYGONACEAE]
Polygonum stevensii Brenckle [family POLYGONACEAE]
Polygonum triangulum E. P. Bicknell [family POLYGONACEAE]
Treatment Author(s)
Mihai Costea
François J. Tardif
Harold R. Hinds†
Information
Plants usually yellowish greenish when fresh or dried, hetero-phyllous. Stems 30–200 cm. Leaf blades light yellowish green, narrowly elliptic to lanceolate, rarely ovate, 35–70 × 7–18(–35) mm, apex acute to acuminate; stem leaves 2.1–3.5(–4.2) times as long as branch leaves; distal leaves usually 1–2 mm, not overtopping flowers, or 5–15 mm, surpassing flowers. Inflorescences axillary and terminal, spikelike; cymes crowded toward tips of branches, 2–5-flowered. Pedicels exserted from ocreae, 2.5–6 mm. Flowers: perianth (2.6–)3–4 mm; tepal margins greenish yellow or yellow, rarely white or pink; stamens 3–6(–8). Achenes enclosed in or exserted from perianth, (2.3–)2.5–3.5 mm, shiny or dull, smooth to roughened, sometimes uniformly or obscurely tubercled; late-season achenes 5–12 mm. 2n = 60.
Phenology
jul-aug (summer), sep-oct (fall)
Altitude range
0–1000 m;
Distribution
USA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Mass.USA Mich.USA Minn.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada N.W.T.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
Subspecies ramosissimum is heterogeneous; some additional elements may deserve recognition. It is closely related to European Polygonum bellardii Allioni, which was collected in south Boston in 1785 (B. L. Robinson 1902). The latter species has semi-open flowers, petaloid tepals with white or pink margins, and eight stamens. A distinct form of P. ramosissimum growing in saline marshes from California has been mistakenly identified as P. patulum Bieberstein (M. Costea and F. J. Tardif 2003b). The morphology of late-season achenes and the branching patterns, which have been emphasized by some authors, appear to have little taxonomic value.
Date Updated: 23 July 2012
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 5,
Names
Polygonum ramosissimum Michaux subsp. ramosissimum [family POLYGONACEAE]
Polygonum atlanticum (B. L. Robinson) E. P. Bicknell [family POLYGONACEAE]
Polygonum exsertum Small [family POLYGONACEAE]
Polygonum interior Brenckle [family POLYGONACEAE]
Polygonum latum Small ex Rydberg [family POLYGONACEAE]
Polygonum leptocarpum B. L. Robinson [family POLYGONACEAE]
Polygonum stevensii Brenckle [family POLYGONACEAE]
Polygonum triangulum E. P. Bicknell [family POLYGONACEAE]
Treatment Author(s)
Mihai Costea
François J. Tardif
Harold R. Hinds†
Information
Plants usually yellowish greenish when fresh or dried, hetero-phyllous. Stems 30–200 cm. Leaf blades light yellowish green, narrowly elliptic to lanceolate, rarely ovate, 35–70 × 7–18(–35) mm, apex acute to acuminate; stem leaves 2.1–3.5(–4.2) times as long as branch leaves; distal leaves usually 1–2 mm, not overtopping flowers, or 5–15 mm, surpassing flowers. Inflorescences axillary and terminal, spikelike; cymes crowded toward tips of branches, 2–5-flowered. Pedicels exserted from ocreae, 2.5–6 mm. Flowers: perianth (2.6–)3–4 mm; tepal margins greenish yellow or yellow, rarely white or pink; stamens 3–6(–8). Achenes enclosed in or exserted from perianth, (2.3–)2.5–3.5 mm, shiny or dull, smooth to roughened, sometimes uniformly or obscurely tubercled; late-season achenes 5–12 mm. 2n = 60.
Phenology
jul-aug (summer), sep-oct (fall)
Altitude range
0–1000 m;
Distribution
USA Ariz.USA Ark.USA Calif.USA Colo.USA Conn.USA Del.USA Ga.USA IdahoUSA Ill.USA Ind.USA IowaUSA Kans.USA Ky.USA La.USA MaineUSA Mass.USA Mich.USA Minn.USA Mo.USA Mont.USA Nebr.USA Nev.USA N.H.USA N.J.USA N.Mex.USA N.Y.USA N.C.USA N.Dak.USA OhioUSA Okla.USA Pa.USA R.I.USA S.C.USA S.Dak.USA Tenn.USA Tex.USA UtahUSA Vt.USA Va.USA Wash.USA Wis.USA Wyo.Canada Alta.Canada B.C.Canada Man.Canada N.B.Canada N.W.T.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.Canada Sask.
Discussion
Subspecies ramosissimum is heterogeneous; some additional elements may deserve recognition. It is closely related to European Polygonum bellardii Allioni, which was collected in south Boston in 1785 (B. L. Robinson 1902). The latter species has semi-open flowers, petaloid tepals with white or pink margins, and eight stamens. A distinct form of P. ramosissimum growing in saline marshes from California has been mistakenly identified as P. patulum Bieberstein (M. Costea and F. J. Tardif 2003b). The morphology of late-season achenes and the branching patterns, which have been emphasized by some authors, appear to have little taxonomic value.
![Polygonum ramosissimum Michaux subsp. ramosissimum [family POLYGONACEAE]](/fsi/img/misc/plants/static_thumbs/flora_north_america_icon96.jpg)
╳
We're sorry. You don't appear to have permission to access the item.
Full access to these resources typically requires affiliation with a partnering organization. (For example, researchers are often granted access through their affiliation with a university library.)
If you have an institutional affiliation that provides you access, try logging in via your institution
Have access with an individual account? Login here
If you would like to learn more about access options or believe you received this message in error, please contact us.