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''Persicaria lapathifolia'' (
/ref>
Atlas of Living Australia, ''Persicaria lapathifolia'' (L.) Gray, Pale Knotweed
/ref> Many varietal and sub-specific names have been coined, as the plant is morphologically variable. The species is found growing on the sea shore and in disturbed ground such as arable land, gardens, waste ground, rubbish tips and road verges.
Jepson eFloraphoto of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1890Calphotos Photo gallery, University of California
{{Taxonbar, from=Q159076 lapathifolia Flora of North America Flora of South America Flora of Asia Flora of Australia Flora of Africa Flora of Europe Plants described in 1753 Taxa named by Carl Linnaeus
syn.
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently.
* In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnae ...
''Polygonum lapathifolium''), known as pale persicaria, is a plant of the family Polygonaceae. It is closely related to '' Persicaria maculosa'' and as such is considered a weed in Britain and Europe. Other common names for the plant include pale smartweed, curlytop knotweed, and willow weed. It is a species complex made up of a great many varying forms, sometimes considered varieties. The environment also has a strong influence on the morphology of an individual plant.
Description
''Persicaria lapathifolia'' is an annual herb with erect reddish stems with swollen joints, growing to a height of . The leaves are alternate with short stalks, often densely hairy underneath. The leaf blades often have a dark-coloured blotch in the centre and are lanceolate or narrowly elliptical and have entire margins. Each leaf base has stipules which are fused into a stem-enclosing sheath that is loose and fringed with few if any hairs at the upper end. The inflorescence is a dense spike, often nodding. The perianth of each tiny pink flower consists of four or five lobes, fused near the base. There are six stamens, two partially fused carpels and two styles. The fruit is a rounded, flattened nut. This plant flowers from July to September in northern temperate regions.Flora of North America, ''Persicaria lapathifolia'' (Linnaeus) Gray, 1821. Pale smartweed , renouée à feuilles de patience/ref>
Distribution and habitat
''Persicaria lapathifolia'' is found in many parts of both theOld World
The "Old World" is a term for Afro-Eurasia that originated in Europe , after Europeans became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia, which were previously thought of by the ...
and New World./ref> Many varietal and sub-specific names have been coined, as the plant is morphologically variable. The species is found growing on the sea shore and in disturbed ground such as arable land, gardens, waste ground, rubbish tips and road verges.
References
External links
Jepson eFlora
{{Taxonbar, from=Q159076 lapathifolia Flora of North America Flora of South America Flora of Asia Flora of Australia Flora of Africa Flora of Europe Plants described in 1753 Taxa named by Carl Linnaeus