Polygonum ramosissimum subsp. ramosissimum

Common names: Renouée à fleurs jaunes
WeedyIllustratedEndemic
Synonyms: Polygonum atlanticum (B. L. Robinson) E. P. Bicknell Polygonum exsertum Small Polygonum interior Brenckle Polygonum latum Small ex Rydberg Polygonum leptocarpum B. L. Robinson Polygonum stevensii Brenckle Polygonum triangulum E. P. Bicknell
Treatment appears in FNA Volume 5. Treatment on page 552. Mentioned on page 551.

Plants usually yellowish greenish when fresh or dried, heterophyllous. 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: Flowering Jul–Oct.
Habitat: Disturbed places, sandy shores or saline soils and shores
Elevation: 0-1000 m

Distribution

V5 1123-distribution-map.gif

Alta., B.C., Man., N.B., N.W.T., N.S., Ont., P.E.I., Que., Sask., Ariz., Ark., Calif., Colo., Conn., Del., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., Wis., Wyo.

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.

Selected References

None.

Lower Taxa

None.

"/2" is not declared as a valid unit of measurement for this property.

0.23 cm2.3 mm <br />0.0023 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exserted +  and included +
dull +  and shiny +
smooth;roughened +
3-gonous +  and ovate +
whitish yellow +
elliptic +  and oblong +
acute;acuminate +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Michaux +
not stipelike +
green +  and bluish green +
obovate;elliptic +
coriaceous +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Renouée à fleurs jaunes +
2-5-flowered +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, Wash. +, Wis. +  and Wyo. +
straight +
dull +  and shiny +
usually smooth +  and roughened +
0-1000 m +
concave +
subequal +
persistent +
adnate +, free +  and distinct +
disarticulating +  and solid +
decumbent to erect +  and prostrate +
unwinged +  and winged +
black +, red +, brown +  and yellowish +
exserted +  and included +
pubescent +  and glabrous +
spheroidal +, 4-gonous +, lenticular +, biconvex +, discoid +, 3-gonous +  and 2-gonous +
Disturbed places, sandy shores or saline soils and shores +
compound +, branched +  and simple +
nonmembranous +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
green +  and light yellowish +
3.5 cm35 mm <br />0.035 m <br /> (7 cm70 mm <br />0.07 m <br />) +
ovate +, narrowly elliptic +  and lanceolate +
sessile +  and petiolate +
deciduous +
sepaloid +  and petaloid +
pubescent +  and glabrous +
cucullate +, elliptic +  and oblong +
not +  and thickened +
swollen +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
erect;spreading +
accrescent +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
spreading;erect +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fleshy +, indurate +  and membranous +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering Jul–Oct. +
(2-)3(-4)-carpellate +
1.8 cm18 mm <br />0.018 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (7 cm70 mm <br />0.07 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
Fl. Bor.-Amer. +
slender;stout +
woody +  and fibrous +
Weedy +, Illustrated +  and Endemic +
3 +  and 6 +
2.1-3.5(-4.2) times as long as branch leaves +
not wiry +  and branched +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
straight +
papillous-scabridulous +
30 cm300 mm <br />0.3 m <br /> (200 cm2,000 mm <br />2 m <br />) +
2 +  and 3 +
penicillate +, fimbriate +  and capitate +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
connate +  and distinct +
spreading;erect +
Polygonum atlanticum +, Polygonum exsertum +, Polygonum interior +, Polygonum latum +, Polygonum leptocarpum +, Polygonum stevensii +  and Polygonum triangulum +
Polygonum ramosissimum subsp. ramosissimum +
Polygonum ramosissimum +
subspecies +
overlapping +
, +, white +, pink +, punct +, greenish yellow with greenish yellow or greenish yellow with yellow +, list +  and coloration +
connate +  and distinct +
pink +, white +, yellow +  and greenish yellow +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
yellowish greenish +
not cushionlike +