Polygonum erectum

Linnaeus

Sp. Pl. 1: 363. 1753.

Common names: Erect knotweed renouée dressée
WeedyEndemic
Treatment appears in FNA Volume 5. Treatment on page 550. Mentioned on page 549, 551.

Plants light green or yellowish, heterophyllous. Stems erect to ascending, sparingly branched in distal 1/2, not wiry, 15–75 cm. Leaves: ocrea 7–12 mm, proximal part cylindric, distal part usually persistent, with strong veins, margins entire or lacerate, silvery, later disintegrating into ± persistent brown fibers; petiole 1–5 mm; blade light green or yellowish, elliptic to obovate, 30–60 (–80) × (8–) 10–25 mm, margins flat, apex obtuse; stem-leaves 1.5–3.5 (–4) times longer than branch leaves; distal leaves overtopping flowers in distal part of inflorescence. Inflorescences axillary; cymes in axils of most leaves and toward tips of stems and branchs, 1–5-flowered. Pedicels mostly exserted from ocreae, 3–7 mm. Flowers closed; perianth 2.8–3.8 (–4.2) mm; tube 20–37% of perianth length; tepals overlapping, green with yellowish, rarely whitish green, margins, sepaloid, not keeled, oblong to obovate, cucullate; midveins branched, moderately to heavily thickened; stamens 7–8. Achenes enclosed in perianth, brown to tan, ovate, 3-gonous, 2.3–3.5 mm, faces subequal, ± concave, apex not beaked, edges concave, dull, striate-tubercled; late-season achenes uncommon, 4–5 mm.


Phenology: Flowering May–Oct.
Habitat: Dry, waste ground
Elevation: 10-300 m

Distribution

V5 1120-distribution-map.gif

Alta., Ont., Que., Sask., Ala., Ark., Colo., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo.

Discussion

Polygonum erectum was cultivated in the midwest by Native Americans for its starchy seeds (C. M. Scarry 1993). It was formerly confused with P. achoreum (T. R. Mertens and P. H. Raven 1965).

Selected References

None.

Lower Taxa

None.

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

... more about "Polygonum erectum"
exserted +  and included +
dull +  and shiny +
smooth;roughened +
3-gonous +  and ovate +
whitish yellow +
elliptic +  and oblong +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Linnaeus +
not stipelike +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
yellowish +  and light green +
3 cm30 mm <br />0.03 m <br /> (6 cm60 mm <br />0.06 m <br />) +
elliptic;obovate +
coriaceous +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Erect knotweed +  and renouée dressée +
1-7(-10)-flowered +
Alta. +, Ont. +, Que. +, Sask. +, Ala. +, Ark. +, Colo. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +  and Wyo. +
striate-tubercled +
concave +
10-300 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 +
Dry, waste ground +
compound +, branched +  and simple +
nonmembranous +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
sessile +  and petiolate +
deciduous +
disintegrating +
pubescent +  and glabrous +
cucullate +, oblong +  and obovate +
swollen +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
erect;spreading +
accrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
spreading;erect +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
fleshy +, indurate +  and membranous +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering May–Oct. +
(2-)3(-4)-carpellate +
slender;stout +
woody +  and fibrous +
Weedy +  and Endemic +
7 +  and 8 +
1.5-3.5(-4) times longer than branch leaves +
not wiry +  and branched +
straight +
erect +  and ascending +
papillous-scabridulous +
15 cm150 mm <br />0.15 m <br /> (75 cm750 mm <br />0.75 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 erectum +
Polygonum sect. Polygonum +
species +
overlapping +
whitish green +  and green with yellowish +
connate +  and distinct +
lobed +  and laciniate +
coriaceous +
1-5-flowered +
persistent +
membranous +
pubescent +  and glabrous +
yellowish +  and light green +
not cushionlike +