Polygonum heterosepalum M.Peck & Ownbey

Oddsepal knotweed (en)

Species

Angiosperms > Caryophyllales > Polygonaceae > Polygonum

Characteristics

Herbs, compact, often cushion-like. Stems erect, green or reddish, simple or branched near base, not wiry, 1.5-5 cm, glabrous. Leaves uniformly distributed, dense, not articulated to ocreae, basal leaves persistent or caducous, distal leaves gradually reduced to bracts; ocrea 3-6 mm, glabrous, proximal part cylindric, distal part disintegrating almost to base, with whitish, straight, rigid fibers; petiole absent; blade 3-veined, without pleats, linear to lanceolate, 10-20 × 0.6-2.7 mm, margins revolute, smooth, apex spine-tipped. Inflorescences axillary; cymes in most axils, 2-3-flowered. Pedicels enclosed in ocreae, erect, 0.1-1 mm. Flowers closed; perianth 2.3-2.7 mm; tube 3-7% of perianth length; tepals overlapping, whitish with whitish or pink margins, petaloid, oblong, navicular, dimorphic, outer 2 shorter than inner 3, outer 2 0.8-1.2 mm, inner 2.3-2.7 mm, papillose at base, apex acute or acuminate; midveins unbranched; stamens 5-6. Achenes enclosed in perianth, olive brown, narrowly ovate to ovate-lanceolate, 1.5-2 mm, faces subequal, shiny, smooth.
Life form annual
Growth form herb
Growth support -
Foliage retention deciduous
Sexuality hermaphrodite
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Nitrogen fixer -
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Environment

Light -
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Hardiness (USDA) 4-9

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
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Cultivation

Mode -
Germination duration (days) 21 - 60
Germination temperacture (C°) 21 - 23
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Distribution

Polygonum heterosepalum world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:206224-2
WFO ID wfo-0001101032
COL ID 4L9GD
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Polygonum heterosepalum