Polygonum minimum

S. Watson

Botany (Fortieth Parallel), 315. 1871.

Common names: Broad-leaf or leafy dwarf knotweed
Endemic
Synonyms: Polygonum torreyi S. Watson
Treatment appears in FNA Volume 5. Treatment on page 569. Mentioned on page 562.

Herbs. Stems prostrate to erect, often zigzagged, reddish-brown, simple or branched from base, wiry, 2–30 cm, papillose-scabridulous. Leaves evenly distributed or crowded at branch tips, articulated to ocreae, basal leaves persistent, hardly reduced distally; ocrea 1–4 mm, papillose-scabridulous, proximal part cylindric, distal part entire or dentate-lacerate; petiole 0.1–3 mm; blade 1-veined, not pleated, narrowly elliptic, elliptic, ovate, obovate, or subround, 6–27 × 3–8 mm, margins flat, smooth, irregularly thickened or papillose-denticulate, apex apiculate, green adaxially. Inflorescences axillary; cymes from near stem and branch bases, sometimes also crowded at branch apices, 1–3-flowered. Pedicels enclosed in ocreae, erect to spreading, 2–3 mm. Flowers semi-open or closed; perianth 1.8–2.5 mm; tube 22–29% of perianth length; tepals overlapping, greenish with narrow white or pink margins, almost sepaloid, oblong, cucullate, ± navicular, apex rounded; midveins thickened, unbranched; stamens 8. Achenes enclosed in perianth or tip exserted, black, elliptic to ovate, 1.8–2.3 mm, faces subequal, smooth, shiny.


Phenology: Flowering Jul–Sep.
Habitat: Alpine to subalpine sites, open or semibarren soil
Elevation: 1500-3300 m

Distribution

V5 1166-distribution-map.gif

Alta., B.C., Alaska, Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Polygonum minimum"
reticulate +, tubercled +  and smooth +
dull +  and shiny +
elliptic +  and ovate +
pink +  and purple +
elliptic +  and oblong +
rounded +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
S. Watson +
not stipelike +
0.6 cm6 mm <br />0.006 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
subround;obovate;subround;obovate;ovate;elliptic +
coriaceous +
0.3 cm3 mm <br />0.003 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 +
Broad-leaf or leafy dwarf knotweed +
1-3-flowered +
dentate-lacerate +  and entire +
Alta. +, B.C. +, Alaska +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1500-3300 m +
subequal +
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 +
Alpine to subalpine sites, open or semibarren soil +
compound +, branched +  and simple +
nonmembranous +
venation +  and 1-veined +
crowded +  and distributed +
deciduous +
reduced +
pink +, white +  and narrow +
not rugulose +
papillose-denticulate +
swollen +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
papillose-scabridulous +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
erect;spreading +
accrescent +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
spreading;erect +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
fleshy +, indurate +  and membranous +
not +  and articulated +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Jul–Sep. +
(2-)3(-4)-carpellate +
Botany (Fortieth Parallel), +
papillose-scabridulous +  and smooth +
slender;stout +
woody +  and fibrous +
wiry +, branched +  and simple +
reddish-brown +
zigzagged +  and straight +
prostrate +  and erect +
papillose-scabridulous +
4-gonous +
2 cm20 mm <br />0.02 m <br /> (30 cm300 mm <br />0.3 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 torreyi +
Polygonum minimum +
Polygonum sect. Duravia +
species +
overlapping +
connate +  and distinct +
navicular +, cucullate +  and oblong +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
heterophyllous +  and homophyllous +