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.

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 +