silverweed

(Argentina anserina)

               
Conservation Status

IUCN Red List

not yet assessed

silverweed

NatureServe

N3N5 - Vulnerable to Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACW - Facultative wetland

Midwest

FACW - Facultative wetland

Northcentral & Northeast

FACW - Facultative wetland

Nativity

Native

Occurrence

Common

Habitat

Moist to wet. Meadows, marshes, beaches, lakeshores, streambanks, mowed paths. Full sun. Sandy or gravelly soils.

Flowering

May to September

     
Flower Color

Yellow

     
Height

2 to 8

     

Identification

This is a 2 to 8 tall, ascending to erect, perennial forb that rises on basal leaves from a narrow, often branched taproot.

It first appears as a dense cluster (rosette) of basal leaves. Soon it produces one or more above-ground, creeping, widely spreading runners (stolons).

Basal leaves are inversely lance-shaped in outline (widest toward the tip), up to 10 long, and up to 4 wide, rarely longer and usually much smaller. They are on 1 to 10 long leaf stalks. Each leaf is pinnately divided into 5 to 31 primary leaflets which often alternate with much smaller secondary leaflets. The leaf axis (rachis) is light green and covered with long, soft, shaggy, sometimes spreading hairs.

The leaflets are oblong or inversely egg-shaped. The larger leaflets are up to 2 long and ¾ wide, sometimes larger. The lower leaflets are much smaller. The upper surface is green and may be hairless or covered with long, silky, somewhat appressed hairs. The lower surface is white. It is densely covered with short, white, matted or tangled hairs, and moderately to densely covered with long silky hairs. The margins are deeply toothed with sharp, forward pointing teeth. There are usually 5 to 8, but as many as 11 or more teeth per side.

The stolons are 12 to 36 long with leafy nodes every 4 to 6 long. Node leaves are similar to basal leave but smaller. Stolons are red and are covered with long, soft, shaggy, sometimes spreading hairs. They send down roots from the nodes which often creates new plants.

The inflorescence is a single flower rising from a stolon node on an ascending to erect, hairy, 2 to 6 long stalk (pedicel).

The flowers are to ¾ in diameter. There are 5 modified leaves (epicalyx bractlets), 5 sepals, 5 petals, 20 to 25 stamens, and 20 to 200 or more pistils. The epicalyx bractlets are green, narrowly to broadly egg-shaped to triangular, often toothed, and about the same size as the sepals. They alternate with the sepals and are hidden below the petals when the flower is viewed from above. The sepals are to long and are densely covered with whitish, silky hairs. The petals are yellow, inversely egg-shaped or oval, 3 16 to long or longer, and to wide. The petals are longer than the sepals. The stamens have yellow, 1 16 to long filaments and yellow anthers.

The fruit is a 1 16 long seed capsule (achene) with a groove on the upper (dorsal) surface.

 
Similar
Species

Silvery cinquefoil (Potentilla argentea) leaves are palmately divided into 5 leaflets.


Distribution Distribution Map  

Sources: 2, 3, 4, 5, 7, 28, 29.

 

 


Comments

Taxonomy
This plant was previously placed within the Anserina/Pentaphylloides section of the genus Potentilla, and was named Potentilla anserina. The genus Potentilla as traditionally used includes from about 300 to over 500 species. However, the group is not evolutionarily distinct (monophyletic). The Anserina group was separated into the genus Argentina by Hill in 1756 based on a single but unique morphological feature, lateral insertion of styles. The separation was supported by Rydberg in 1908 but not widely accepted. In 2010, the separation was strengthened by the discovery of a second, unique, previously unused morphological feature, ventral stipular auricles, as well as by recent molecular phylogenetic studies by Dobeš and Paule in 2010 and Töpel et al. in 2011. The new genus Argentina contains a single species, Argentina anserina, in North America and 63 species in Asia. The species Argentina anserina is a species complex containing what should be several distinct species whose boundaries are as yet unclear.


Taxonomy

Family:

Rosaceae (rose)

 
Subordinate Taxa

Greenland silverweed (Argentina anserina groenlandica)

Pacific silverweed (Argentina anserina egedei)

silverweed (Argentina anserina anserina)

 
Synonyms

Potentilla anserina

Potentilla anserina ssp. anserina

 
Common
Names

common silverweed

goose-grass

goose-tansy

silver-weed

silverweed

silverweed cinquefoil

   

 

 

 

 

 

 

 

 

Glossary

Achene

A dry, one-chambered, single-seeded seed capsule, formed from a single carpel, with the seed attached to the membranous outer layer (wall) only by the seed stalk; the wall, formed entirely from the wall of the superior ovary, does not split open at maturity, but relies on decay or predation to release the contents.

 

Bract

Modified leaf at the base of a flower stalk or flower cluster.

 

Bractlet

A small, often secondary bract within an inflorescence; a bract that is borne on a petiole instead of subtending it; bracteole.

 

Epicalyx

A whorl of bracts, just below the calyx, resembling a secondary, outer calyx.

 

Pedicel

In plants: the stalk of a single flower in a cluster of flowers. In Hymenoptera and Araneae: the narrow stalk connecting the thorax to the abdomen.

 

Pinnate

Having the leaflets of a compound leaf arranged on opposite sides of a common stalk.

 

Rachis

The main axis of a compound leaf, appearing as an extension of the leaf stalk; the main axis of an inflorescence.

 

Rosette

A radiating group or cluster of leaves usually on or close to the ground.

 

Sepal

An outer floral leaf, usually green but sometimes colored, at the base of a flower.

 

Stolon

An above-ground, creeping stem that grows along the ground and produces roots and sometimes new plants at its nodes. A runner.

       

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About

Silverweed (Argentina anserina).

 
     
  Potentilla anserina (Silverweed)
Allen Chartier
 
  Potentilla anserina (Silverweed)  

 

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  Common Silverweed (Argentina Anserina) - 2012-08-29
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About

Published on Sep 3, 2012

Argentina anserina, also known as Common Silverweed, Silverweed Cinquefoil or just "silverweed", is a flowering perennial plant in the rose family Rosaceae.

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Zilverschoon (Potentilla anserina) is een plant uit de rozenfamilie (Rosaceae). 52.01315 4.30070

 
     

 

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