Polygonum patulum

M. Bieberstein

Fl. Taur.-Caucas. 1: 304. 1808.

Introduced
Treatment appears in FNA Volume 5. Treatment on page 560. Mentioned on page 547, 549, 552.

Plants green or bluish green, heterophyllous. Stems mostly ascending or erect, branched from base, not wiry, 20–80 cm. Leaves: ocrea 7–9 mm, proximal part cylindic, distal part disintegrating into straight fibers; petiole 0.2–1 mm; blade green or bluish green, linear to lanceolate, 25–40 × 4–8 mm, margins flat, apex acute; stem-leaves 2–4 times as long as branch leaves; distal leaves abruptly reduced and not overtopping flowers (shorter than or equaling flowers). Inflorescences axillary and terminal, spikelike; cymes aggregated at tips of stems and branches, 1–3-flowered. Pedicels enclosed in ocreae, 1.5–2 mm. Flowers closed or semi-open; perianth 2.2–3 mm; tube 15–30% of perianth length; tepals overlapping, green with white to pink margins, petaloid, not keeled, oblong, cucullate; veins branched; stamens 8. Achenes slightly exserted from perianth, light-brown to dark-brown, ovate, 3-gonous, 2–2.3 (–2.8) mm, faces subequal, concave, apex not beaked, edges concave, dull, striate-tubercled; late-season achenes uncommon, 2.5–4 mm.


Phenology: Flowering Jul–Oct.
Habitat: Waste places
Elevation: 0-800 m

Distribution

V5 1143-distribution-map.gif

Introduced; Ala., Ill., Wash., Eurasia, n Africa

Discussion

The name Polygonum patulum has been misapplied to a distinctive form of P. ramosissimum in saline marshes in California (M. Costea and F. J. Tardif 2003b).

Selected References

None.

Lower Taxa

None.

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

... more about "Polygonum patulum"
0.23 cm2.3 mm <br />0.0023 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
light-brown;dark-brown +
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† +
M. Bieberstein +
not stipelike +
bluish green +  and green +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear;lanceolate +
coriaceous +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
1-3-flowered +
Ala. +, Ill. +, Wash. +, Eurasia +  and n Africa +
striate-tubercled +
concave +
0-800 m +
concave +
subequal +
straight +
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 +
Waste places +
compound +, branched +  and simple +
nonmembranous +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
sessile +  and petiolate +
deciduous +
white +  and pink +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
swollen +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
erect;spreading +
accrescent +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
spreading;erect +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
fleshy +, indurate +  and membranous +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Flowering Jul–Oct. +
(2-)3(-4)-carpellate +
Fl. Taur.-Caucas. +
slender;stout +
woody +  and fibrous +
Introduced +
2-4 times as long as branch leaves +
not wiry +  and branched +
straight +
erect +  and ascending +
papillous-scabridulous +
20 cm200 mm <br />0.2 m <br /> (80 cm800 mm <br />0.8 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 patulum +
Polygonum sect. Polygonum +
species +
overlapping +
connate +  and distinct +
cucullate +, oblong +  and not keeled +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
bluish green +  and green +
not cushionlike +