silverweed

(Argentina anserina ssp. anserina)

Conservation Status
silverweed
 
  IUCN Red List

not listed

     
  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

     
           
 
Description
 
 

Silverweed 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.

 
     
 

Height

 
 

2 to 8

 
     
 

Flower Color

 
 

Yellow

 
     
 

Similar Species

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

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

 
     
 
Biology
 
 

Flowering

 
 

May to September

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  10/15/2019      
         
 

Nativity

 
 

Native

 
         
 

Occurrence

 
 

Common

 
         
 
Taxonomy
 
  Kingdom Plantae (green algae and land plants)  
  Subkingdom Viridiplantae (green plants)  
  Infrakingdom Streptophyta (land plants and green algae)  
  Superdivision Embryophyta (land plants)  
  Division Tracheophyta (vascular plants)  
  Subdivision Spermatophytina (seed plants)  
  Class Magnoliopsida (flowering plants)  
  Superorder Rosanae  
 

Order

Rosales (roses, elms, figs, and allies)  
 

Family

Rosaceae (rose)  
  Subfamily Rosoideae  
  Tribe Potentilleae (strawberries, cinquefoils, and allies)  
  Subtribe Potentillinae  
 

Genus

Argentina  
  Species Argentina anserina (common silverweed)  
       
 

Silverweed 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 separation of Argentina remains controversial. USDA PLANTS and Plants of the World Online recognize the genus, ITIS, GRIN, Flora of North America, and World Flora Online do not.

 
       
 

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, flower cluster, or inflorescence.

 

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

On plants: the stalk of a single flower in a cluster of flowers. On 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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Habitat

  silverweed    
       

Plant

  silverweed   silverweed
       

Inflorescence

  silverweed   silverweed

Leaf

  silverweed    
       
       

 

Camera

     
Slideshows
   
  Silverweed
Wez Smith
 
  Silverweed  
 
About

Silverweed (Argentina anserina).

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

 

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Other Videos
 
  Common Silverweed (Argentina Anserina) - 2012-08-29
Westdelta
 
   
 
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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