Polygonum austiniae

Greene

Bull. Calif. Acad. Sci. 1: 212. 1885.

Common names: Mrs. Austin’s knotweed
Endemic
Synonyms: Polygonum douglasii subsp. austiniae (Greene) E. Murray
Treatment appears in FNA Volume 5. Treatment on page 569. Mentioned on page 562, 568.
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Herbs. Stems ascending to erect, green to purplish, much-branched from base, not wiry, 5–10 (–20) cm, papillose-scabridulous. Leaves uniformly distributed, articulated to ocreae, basal leaves persistent, distal leaves abruptly reduced to bracts, articulated to ocreae; ocrea 3–5 mm, papillose-scabridulous or glabrous, proximal part funnelform, distal part lacerate; petiole 0.1–2 mm; blade 1-veined, not pleated, ovate to elliptic or obovate, 5–15 × 4–7 mm, margins flat or narrowly revolute, papillose-denticulate, apex acute or mucronate. Inflorescences axillary and terminal, spikelike, slender; cymes spaced along branches, 1–4-flowered. Pedicels exserted from ocreae, reflexed, 1–2.5 mm. Flowers closed; perianth (1.8–) 2–2.6 mm; tube 20–28% of perianth length; tepals overlapping, green or purple, with narrow whitish margins, petaloid or sepaloid, oblong, cucullate, navicular, apex rounded; midveins unbranched; stamens 8. Achenes enclosed in perianth, black, elliptic to obovate, 2–2.5 mm, faces subequal, shiny, ± smooth.


Phenology: Flowering Jun–Sep.
Habitat: Dry to moist flats on banks, sagebrush plains, and ponderosa pine forests
Elevation: 1300-1600 m

Distribution

V5 1165-distribution-map.gif

Alta., B.C., Calif., Idaho, Mont., Nev., Oreg., 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 austiniae"
reticulate +, tubercled +  and smooth +
exserted +  and included +
dull +  and shiny +
elliptic +  and obovate +
pink +  and purple +
elliptic +  and oblong +
rounded;mucronate;acute +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Greene +
not stipelike +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
ovate;elliptic or obovate +
coriaceous +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Mrs. Austin’s knotweed +
1-4-flowered +
Alta. +, B.C. +, Calif. +, Idaho +, Mont. +, Nev. +, Oreg. +, Wash. +  and Wyo. +
1300-1600 m +
subequal +
adnate +, free +  and distinct +
semi-open +  and open +
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 to moist flats on banks, sagebrush plains, and ponderosa pine forests +
compound +, branched +  and simple +
nonmembranous +
articulated +
distributed +
deciduous +
not rugulose +
papillose-denticulate +, revolute +  and flat +
swollen +
silvery +, white +  and hyaline +
disintegrating +
deciduous +  and persistent +
papillose-scabridulous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
accrescent +
0.1 cm1 mm <br />0.001 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
spreading;erect +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.2 cm2 mm <br />0.002 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
fleshy +, indurate +  and membranous +
not +  and articulated +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering Jun–Sep. +
(2-)3(-4)-carpellate +
Bull. Calif. Acad. Sci. +
papillose-scabridulous +  and smooth +
slender;stout +
woody +  and fibrous +
not wiry +  and much-branched +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
green +  and purplish +
zigzagged +  and straight +
ascending +  and erect +
papillose-scabridulous +
4-gonous +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 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 douglasii subsp. austiniae +
Polygonum austiniae +
Polygonum sect. Duravia +
species +
sepaloid +  and petaloid +
overlapping +
purple +  and green +
connate +  and distinct +
navicular +, cucullate +  and oblong +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
heterophyllous +  and homophyllous +