Polygonella articulata

(Linnaeus) Meisner

Pl. Vasc. Gen. 2: 228. 1841.

Common names: Northern jointweed
Endemic
Basionym: Polygonum articulatum Linnaeus Sp. Pl. 1: 363. 1753
Treatment appears in FNA Volume 5. Treatment on page 539. Mentioned on page 535.

Herbs, annual, synoecious, 1–5 dm. Stems erect, branched proximally and distally, glabrous. Leaves persistent or fugaceous; ocrea margins not ciliate; blade linear to narrowly clavate, (1.5–) 5–20 (–35) × 0.4–1.2 mm, base barely tapered, margins not hyaline, apex obtuse, glabrous. Inflorescences (13–) 20–33 (–40) mm; ocreola encircling rachis, only the base adnate to rachis, apex acute. Pedicels spreading in anthesis, reflexed in fruit, 0.9–2.1 mm, longer than subtending ocreola. Flowers bisexual; outer tepals loosely appressed in anthesis and fruit, pink to white, occasionally red, distal portion of midrib often inconspicuously greenish, elliptic to obovate, 1.3–2.3 mm in flower, margins entire to erose; inner tepals loosely appressed in anthesis and fruit, white to pink, occasionally red, elliptic, 1.3–2.3 mm in anthesis, margins mostly entire; filaments dimorphic; anthers yellow or pink; styles and stigmas ca. 0.1 mm in anthesis. Achenes included or exserted, reddish-brown, 3 (–4) -gonous, 2–2.8 × 1–1.3 mm, shiny, smooth. 2n = 32.


Phenology: Flowering Sep–Nov.
Habitat: Pine barrens, sandhills, and sandy sites along lake shores, beaches, river banks, roadsides, and railroads
Elevation: 0-500 m

Distribution

V5 1104-distribution-map.gif

Ont., P.E.I., Que., Conn., Del., Ga., Ill., Ind., Iowa, Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Pa., R.I., Wis., Vt., Va.

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Polygonella articulata"
winged +  and wingless +
reddish-brown +
0.2 cm2 mm <br />0.002 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
exserted +  and included +
3(-4)-gonous +
1mm;1.3mm +
pink +  and yellow +
elliptic +  and ovate or round +
acute;obtuse +
Craig C. Freeman +
(Linnaeus) Meisner +
tapered +
Polygonum articulatum +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
linear;narrowly clavate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Northern jointweed +
elliptic +  and obovate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
Ont. +, P.E.I. +, Que. +, Conn. +, Del. +, Ga. +, Ill. +, Ind. +, Iowa +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Pa. +, R.I. +, Wis. +, Vt. +  and Va. +
0-500 m +
curved +  and straight +
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 +
Pine barrens, sandhills, and sandy sites along lake shores, beaches, river banks, roadsides, and railroads +
3.3 cm33 mm <br />0.033 m <br /> (4 cm40 mm <br />0.04 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
nonmembranous +
fugaceous +  and persistent +
entire +  and erose +
not hyaline +
pubescent +  and glabrous +
lobed +, undulate +, crisped +, crenulate +  and entire +
swollen +
partly +  and foliaceous +
disintegrating +
deciduous +  and persistent +
cylindric +
coriaceous +  and chartaceous +
3 +  and 5 +
5 +, 1 +  and 2 +
anatropous +, , +  and orthotropous +
reflexed;spreading +
accrescent +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
spreading;erect +
yellowish;greenish;yellowish;greenish;red;pink;white +
campanulate +
nonaccrescent +
fleshy +, indurate +  and membranous +
Flowering Sep–Nov. +
(2-)3(-4)-carpellate +
Pl. Vasc. Gen. +
slender;stout +
horned +  and toothed +
prostrate +  and decumbent +
penicillate +, fimbriate +  and capitate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
deciduous +  and persistent +
2-lobed +  and cylindric +
coriaceous +  and membranous +
distinct +
0.1 cm1 mm <br />0.001 m <br /> (?) +
spreading;erect +
Polygonella articulata +
Polygonella +
species +
transitional +  and petaloid +
distinct +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +