Polygonum engelmannii

Greene

Bull. Calif. Acad. Sci. 1: 126. 1885.

Common names: Engelmann’s knotweed
Endemic
Synonyms: Polygonum douglasii subsp. engelmannii (Greene) Kartesz & Gandhi
Treatment appears in FNA Volume 5. Treatment on page 569. Mentioned on page 562.
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Herbs. Stems erect, green or purplish brown, branched from base, not wiry, 4–30 cm, glabrous or minutely papillose-scabridulous. Leaves uniformly distributed, articulated to ocreae, basal leaves persistent, distal leaves abruptly reduced to bracts; ocrea 3–5 mm, papillose-scabridulous or glabrous, proximal part funnelform, distal part becoming lacerate with age; petiole 0.1–2 mm; blade 1-veined, not pleated, linear-oblanceolate, 10–20 (–25) × 1–3 (–4) mm, margins revolute, smooth, apex acute to mucronate. Inflorescences axillary and terminal, spikelike, loosely floriferous nearly to base, elongate; cymes spaced along branches, (1–) 2–4-flowered. Pedicels exserted from ocreae, reflexed, 1–3 mm. Flowers closed; perianth 1.5–2 (–2.5) mm; tube 18–26% of perianth length; tepals initially overlapping and cucullate, later forced apart by developing achene, greenish or sometimes purple, with white margins, petaloid or sepaloid, oblong, ± flat or navicular, apex rounded; midveins unbranched; stamens 5–8. Achenes exserted from perianth, black, elliptic, 1.2–2.3 mm, faces subequal, shiny, smooth.


Phenology: Flowering Jun–Sep.
Habitat: Dry to moist sandy or well-drained soils, sagebrush desert to lower mountains
Elevation: 1000-1500 m

Distribution

V5 1164-distribution-map.gif

Alta., B.C., Colo., Idaho, Mont., Nev., S.Dak., Utah, Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Polygonum engelmannii"
reticulate +, tubercled +  and smooth +
exserted +  and included +
dull +  and shiny +
3-gonous +, ovate +  and elliptic or lanceolate +
pink +  and purple +
elliptic +  and oblong +
rounded;acute;mucronate +
Mihai Costea +, François J. Tardif +  and Harold R. Hinds† +
Greene +
not stipelike +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
linear-oblanceolate +
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 +
Engelmann’s knotweed +
(1-)2-4-flowered +
Alta. +, B.C. +, Colo. +, Idaho +, Mont. +, Nev. +, S.Dak. +, Utah +  and Wyo. +
1000-1500 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 sandy or well-drained soils, sagebrush desert to lower mountains +
elongate +  and spikelike +
nonmembranous +
articulated +
distributed +
deciduous +
not rugulose +
papillose-denticulate +
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 /> (0.3 cm3 mm <br />0.003 m <br />) +
spreading;erect +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
greenish white;pink +
campanulate +  and urceolate +
nonaccrescent +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 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 +
5 +  and 8 +
not wiry +  and branched +
purplish brown +  and green +
zigzagged +  and straight +
papillose-scabridulous +
4-gonous +
4 cm40 mm <br />0.04 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 douglasii subsp. engelmannii +
Polygonum engelmannii +
Polygonum sect. Duravia +
species +
sepaloid +  and petaloid +
apart +  and overlapping +
connate +  and distinct +
navicular +, flat +, oblong +  and cucullate +
coriaceous +
persistent +
membranous +
pubescent +  and glabrous +
heterophyllous +  and homophyllous +