Polygonum spergulariiforme

Meisner ex Small

Bull. Torrey Bot. Club 19: 366. 1892.

Common names: Spurry or fall knotweed
Endemic
Synonyms: Polygonum douglasii subsp. spergulariiforme (Meisner ex Small) J. C. Hickman Polygonum emaciatum A. Nelson
Treatment appears in FNA Volume 5. Treatment on page 570. Mentioned on page 562, 568.

Herbs. Stems erect, green, divaricately branched, not wiry, 5–50 cm, usually papillose-scabridulous, rarely glabrescent. Leaves uniformly distributed, articulated to ocreae, basal leaves usually caducous, distal leaves abruptly reduced to bracts, articulated to ocreae; ocrea 8–12 mm, papillose-scabridulous, proximal part cylindric, distal part disintegrating into a few persistent fibers; petiole 0.1–2 mm; blade 1-veined, not pleated, linear to lanceolate, 35–60 × 1–3 mm, margins flat or narrowly revolute, smooth or papillose-denticulate, apex acute, mucronate. Inflorescences axillary and terminal, spikelike, dense; cymes crowded, ± overlapping at branch tips, 2–5-flowered. Pedicels enclosed in or slightly exserted from ocreae, erect to spreading, 0.5–2 mm. Flowers open or semi-open; perianth 3–5 mm; tube 9–17% of perianth length; tepals overlapping, uniformly pink or white, petaloid, oblong-obovate, cucullate, navicular in distal 1/4, apex rounded; midveins branched; stamens 8. Achenes enclosed in perianth, black, narrowly elliptic or elliptic-lanceolate to narrowly ovate, 3–5 mm, faces subequal, shiny, smooth to striate-tubercled.


Phenology: Flowering Jun–Oct.
Habitat: Moist to dry, open rocky places, including serpentine
Elevation: 10-2000 m

Distribution

V5 1168-distribution-map.gif

B.C., Calif., Idaho, Mont., Oreg., Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

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

reticulate +, tubercled +  and smooth +
exserted +  and included +
dull +  and shiny +
elliptic-lanceolate +  and narrowly ovate +
pink +  and purple +
elliptic +  and oblong +
rounded;mucronate;acute +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Meisner ex Small +
not stipelike +
3.5 cm35 mm <br />0.035 m <br /> (6 cm60 mm <br />0.06 m <br />) +
linear;lanceolate +
coriaceous +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
foliaceous +  and perfoliate +
scale-like +
just below the soil surface or and above the soil surface +  and spreading +
Spurry or fall knotweed +
2-5-flowered +
overlapping +  and crowded +
B.C. +, Calif. +, Idaho +, Mont. +, Oreg. +, Wash. +  and Wyo. +
10-2000 m +
smooth +  and striate-tubercled +
subequal +
persistent +
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 +
Moist to dry, open rocky places, including serpentine +
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 +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
coriaceous +  and membranous +
somewhat larger +
anatropous +, , +  and orthotropous +
erect;spreading +
accrescent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
spreading;erect +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 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–Oct. +
(2-)3(-4)-carpellate +
Bull. Torrey Bot. Club +
papillose-scabridulous +  and smooth +
slender;stout +
woody +  and fibrous +
not wiry +  and branched +
zigzagged +  and straight +
glabrescent +
papillose-scabridulous +
4-gonous +
5 cm50 mm <br />0.05 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 douglasii subsp. spergulariiforme +  and Polygonum emaciatum +
Polygonum spergulariiforme +
Polygonum sect. Duravia +
species +
overlapping +
white +  and pink +
connate +  and distinct +
navicular +, cucullate +  and oblong-obovate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
heterophyllous +  and homophyllous +