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Persicaria lapathifolia
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Willow Weed
( Persicaria lapathifolia )
Persicaria lapathifolia
More Photos at CalPhotos
More Info at Jepson eFlora
Calflora
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About Willow Weed (Persicaria lapathifolia)
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Persicaria lapathifolia
(syn. Polygonum lapathifolium), known as pale persicaria, is a plant of the family Polygonaceae. It is closely related to Redshank 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.
Persicaria lapathifolia
is found in many parts of both the Old World and New World. 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.
Persicaria lapathifolia
is an annual herb with erect reddish stems with swollen joints, growing to a height of 20 to 80 cm (8 to 31 in). 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. Distribution and habitat.
Persicaria lapathifolia
is found in many parts of both the Old World and New World. 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.
Plant Description
Plant Type
Annual herb
Size
0.7 - 2.6 ft tall
Flower Color
Pink
Wildlife Supported
Butterflies & moths hosted ( 1
confirmed
, 9
likely
* )
SHOW ALL
Henry's Marsh Moth
Acronicta insularis
Acronicta insularis
*
Purplish Copper
Lycaena helloides
Lycaena helloides
*
Isabella Tiger Moth
Pyrrharctia isabella
Pyrrharctia isabella
*
Corn Earworm Moth
Helicoverpa zea
Helicoverpa zea
*
Salt Marsh Moth or Acrea Moth
Estigmene acrea
Estigmene acrea
*
Southern Emerald
Synchlora frondaria
Synchlora frondaria
*
Hawaiian Beet Webworm
Spoladea recurvalis
Spoladea recurvalis
Landscaping Information
Natural Setting
Climate
Annual Precipitation: 2.7" - 77.2", Summer Precipitation: 0.14" - 2.03", Coldest Month: 31.1" - 58.3", Hottest Month: 56.8" - 88.4", Humidity: 0.49" - 38.95", Elevation: -109" - 6310"
Alternative Names
Common Names
: Curltop Ladysthumb, Curlytop Knotweed, Curlytop Smartweed, Dock-leaf Smartweed, For The Plant, Nodding Smartweed, Pale Smartweed
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Willow Weed
Persicaria lapathifolia
Sources include:
Wikipedia
. All text shown in the "About" section of these pages is available under the
Creative Commons Attribution-ShareAlike License
. Plant observation data provided by the participants of the
California Consortia of Herbaria
, Sunset information provided by
Jepson Flora Project
. Propogation from seed information provided by the
Santa Barbara Botanical Garden
from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include
CalPhotos
,
Wikimedia Commons
, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include
Calflora
,
CNPS Manual of Vegetation Online
,
Jepson Flora Project
,
Las Pilitas
,
Theodore Payne
,
Tree of Life
,
The Xerces Society
, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from
PRISM Climate Group, Oregon State University
, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.
Links:
Jepson eFlora Taxon Page
CalPhotos
Wikipedia
Calflora
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