Polygonum fowleri subsp. fowleri

Fowler's knotweed
Common names: Fowler’s knotweed renouée de Fowler
IllustratedEndemic
Synonyms: Polygonum allocarpum S. F. Blake
Treatment appears in FNA Volume 5. Treatment on page 555.
Revision as of 09:09, 30 July 2020 by imported>Volume Importer
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Plants rarely purple-tinged, homophyllous or heterophyllous, subsucculent. Stems prostrate to ascending, 15–50 cm. Leaves: ocrea 4–12 mm; petiole 5–7 mm; blade green, rarely purple-tinged, elliptic to elliptic-obovate, 20–35 (–50) × 10–15 (–25) mm, apex acute or obtuse; middle stem-leaves 1.1–2.1 (–3.4) times as long as adjacent branch leaves. Cymes 1–5-flowered. Pedicels 1–2.5 mm. Perianths 3–4.5 mm. Achenes broadly ovate, 3-gonous, (2.5–) 3–3.7 (–4.5) mm, faces subequal, concave, roughened, rarely obscurely tubercled. 2n = 40, 60.


Phenology: Flowering Jul–Oct.
Habitat: Sandy, gravelly seashores
Elevation: 0-30 m

Distribution

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St. Pierre and Miquelon, B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Yukon, Alaska, Calif., Maine, Oreg., Wash.

Discussion

Selected References

None.

Lower Taxa

None.

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

0.37 cm3.7 mm <br />0.0037 m <br /> - 0.45 cm4.5 mm <br />0.0045 m <br /> +
brown;dark-brown +
exserted +  and included +
dull +  and shiny +
smooth;roughened +
3-gonous +  and ovate +
whitish yellow +
elliptic +  and oblong +
obtuse;acute +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Fowler's knotweed +
not stipelike +
3.5 cm35 mm <br />0.035 m <br /> - 5 cm50 mm <br />0.05 m <br /> +
1.5 cm15 mm <br />0.015 m <br /> - 2.5 cm25 mm <br />0.025 m <br /> +
purple-tinged +  and green +
2 cm20 mm <br />0.02 m <br /> - 3.5 cm35 mm <br />0.035 m <br /> +
elliptic;elliptic-obovate +
coriaceous +
1 cm10 mm <br />0.01 m <br /> - 1.5 cm15 mm <br />0.015 m <br /> +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Fowler’s knotweed +  and renouée de Fowler +
1-5-flowered +
distributed +
St. Pierre and Miquelon +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Yukon +, Alaska +, Calif. +, Maine +, Oreg. +  and Wash. +
shiny +  and dull +
concave +
0-30 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 +
Sandy, gravelly seashores +
compound +, branched +  and simple +
nonmembranous +
0.4 cm4 mm <br />0.004 m <br /> - 0.6 cm6 mm <br />0.006 m <br /> +
sessile +  and petiolate +
deciduous +
white +  and pink +
pubescent +  and glabrous +
cucullate +, oblong +  and not keeled +
1.1-2.1 - -3.4 times as long as adjacent branch leaves +
swollen +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
0.4 cm4 mm <br />0.004 m <br /> - 1.2 cm12 mm <br />0.012 m <br /> +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
erect;spreading +
accrescent +
0.1 cm1 mm <br />0.001 m <br /> - 0.25 cm2.5 mm <br />0.0025 m <br /> +
spreading;erect +
0.22 cm2.2 mm <br />0.0022 m <br /> - 0.25 cm2.5 mm <br />0.0025 m <br /> +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.3 cm3 mm <br />0.003 m <br /> - 0.45 cm4.5 mm <br />0.0045 m <br /> +
fleshy +, indurate +  and membranous +
0.5 cm5 mm <br />0.005 m <br /> - 0.7 cm7 mm <br />0.007 m <br /> +
Flowering Jul–Oct. +
- 2-3 - -4-carpellate +
slender;stout +
woody +  and fibrous +
Illustrated +  and Endemic +
6 +  and 8 +
not wiry +  and branched +
straight +
prostrate +  and ascending +
papillous-scabridulous +
15 cm150 mm <br />0.15 m <br /> - 50 cm500 mm <br />0.5 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 allocarpum +
Polygonum fowleri subsp. fowleri +
Polygonum fowleri +
subspecies +
overlapping +
connate +  and distinct +
lobed +  and laciniate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
heterophyllous +  and homophyllous +
not cushionlike +