Persicaria sagittata (L.) H.Gross

Tearthumb (en), Renouée sagittée (fr), Gratte-cul (fr)

Species

Angiosperms > Caryophyllales > Polygonaceae > Persicaria

Characteristics

Plants annual, 3-20 dm; roots also often arising from proximal nodes. Stems scandent, ribbed, glabrous; prickles 1-1.5 mm. Leaves: ocrea brownish, cylindric, (3-)5-13 mm, chartaceous, base inflated or not, without prickles, margins oblique, glabrous or ciliate at tip with bristles 0.2-1 mm, surface glabrous; petiole 0.5-4 cm; blade broadly lanceolate to oblong, 2-8.5 × 1-3 cm, base sagittate to cordate, margins entire, ciliate or eciliate, apex obtuse to acute, faces glabrous or densely appressed-pubescent, usually with retrorse prickles along midvein abaxially. Inflorescences capitate or paniclelike, uninterrupted, 5-15 × 4-10 mm; peduncle 10-80 mm, usually glabrous, sometimes with retrorse prickles proximally; ocreolae overlapping, margins eciliate. Pedicels mostly ascending, 1-1.5 mm. Flowers 2-3 per ocreate fascicle; perianth white or greenish white, often tinged pink or red, sometimes entirely pink, glabrous, accrescent, not becoming blue and fleshy in fruit; tepals 5, connate 1/ 1/ 2 their length, broadly elliptic, 3-5 mm, apex obtuse; stamens 8, filaments distinct, free; anthers pink, ovate; styles 3, connate to middle. Achenes included or styles exserted, light or dark brown to black, 3-gonous, 2.5-4 × 1.8-2.5 mm, dull to shiny, smooth to minutely punctate. 2n = 40.
Life form annual
Growth form herb
Growth support climber
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread -
Mature width (meter) -
Mature height (meter) 0.3 - 0.6
Root system fibrous-root
Rooting depth (meter) 0.2
Root diameter (meter) -
Flower color -
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Moist shaded sites, meadows, pastures, fens, swamps, shorelines of ponds and streams; at elevations up to 1,000 metres. Ditches in Kerry.
Light 6-8
Soil humidity 5-8
Soil texture 1-6
Soil acidity 2-8
Soil nutriment -
Hardiness (USDA) 4-9

Usage

Uses dye experimental purposes medicinal silage stabilisation of sandy soils
Edible seeds
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by seedlings.
Mode seedlings
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Flower

Persicaria sagittata flower picture by ElizKatherine (cc-by-sa)

Distribution

Persicaria sagittata world distribution map, present in Bhutan, Canada, China, Dominican Republic, France, United Kingdom of Great Britain and Northern Ireland, Japan, Liberia, Mongolia, Nepal, Korea (Democratic People's Republic of), Taiwan, Province of China, United States of America, and Venezuela (Bolivarian Republic of)

Conservation status

Persicaria sagittata threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:695143-1
WFO ID wfo-0000488273
COL ID 4F9X4
BDTFX ID 51701
INPN ID 645325
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Truellum sagittatum Polygonum sagittatum Tasoba sagittata Helxine sagittatum Tracaulon sagittatum Polygonum belophyllum Truellum sibiricum Truellum paludosum Truellum sieboldii Polygonum paludosum Polygonum sieboldii Persicaria sieboldii Tracaulon sibiricum Tracaulon sieboldii Polygonum sagittatum var. gracilentum Polygonum sagittatum var. sieboldii Polygonum sieboldii var. pratense Polygonum sagittatum var. paludosum Polygonum sagittatum var. boreale Polygonum sagittatum subsp. sieboldii Polygonum sagittatum var. sibiricum Persicaria sagittata var. sieboldii Persicaria sieboldii var. brevifolia Persicaria sagittata