tall thimbleweed

(Anemone virginiana var. alba)

               
Conservation Status

IUCN Red List

not yet assessed

tall thimbleweed (var. alba)

NatureServe

NNR - Unranked

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACU - Facultative upland

Midwest

FACU - Facultative upland

Northcentral & Northeast

FACU - Facultative upland

Nativity

Native

Photo by Luciearl
Occurrence

Common

 
Habitat

Moist. Open woods, thickets, river banks. Partial shade.

Flowering

June to August

     
Flower Color

White

     
Height

12 to 40

     

Identification

This is an erect, perennial, 12 to 27 tall forb rising from a stout, short, ascending to vertical caudex.

A whorl of 1 to 5 basal leaves rises from the ground at the top of the caudex. Basal leaves are on 2 to 13¾ long leaf stalks (petioles). The leaf blades are broadly inversely egg-shaped in outline and are divided into three leaflets. The terminal leaflet is unstalked or nearly unstalked, inversely egg-shaped or inversely lance-shaped in outline, ¾ to 3½ long, and ¾ to 4 wide. It is wedge-shaped to broadly wedge-shaped at the base and is often cut at the tip into 3 lobes. The lobes may be shallow or deep, and often have secondary lobes. The ultimate lobes are sharply pointed. The surfaces are covered with long, soft, straight hairs, more so on the lower surface. The margins are coarsely toothed with sharp, forward pointing teeth. The lateral leaflets are similar but sometimes deeply divided into 2 segments, causing the leaf blade to appear at first inspection to be divided into 4 or 5 segments.

A single flowering stem rises from the caudex at the base of the whorl of leaves. At the top of the stem there is a whorl of 3 leaf-like involucral bracts (sometimes called involucral leaves) and 1 to 9 (usually 3 or fewer) flowering stalks (peduncles). The involucral bracts are conspicuously stalked and similar to the basal leaves.

The inflorescence is a single flower at the end of each peduncle. Each peduncle is 4 to 12 long, unbranched, and moderately to densely covered with long, soft, shaggy, unmatted hairs. There are 2 leaf-like secondary involucral bracts usually on all but one of the peduncles that closely resemble the stem leaves. The bracts are usually straight across or almost straight across at the base and straight to concave along the sides. The terminal bractlet is deep green.

The flower is ¾ to 1 in diameter. There are no petals, usually 5 petal-like sepals, and 50 to 70 stamens with yellow or light brown anthers. The sepals are oblong to egg-shaped or inversely egg-shaped, greenish-white, to ¾ long, and to wide.

The infructescence is a dense, cylinder-shaped, thimble-like, ½ to 1 long, 5 16 to in diameter fruiting head. It appears very prickly.

The fruit is an achene with a tuft of hair attached to the end. In the fall when the achenes mature the fruiting head appears cottony.

 
Similar
Species

Candle anemone (Anemone cylindrica) has a longer, narrower, less prickly fruiting head. It has up to 10 leaves in a whorl at the base of the flowering stalk. There are no leaf-like bracts on any of the flower stalks.

Tall thimbleweed (Anemone virginiana var. virginiana) bracts on the peduncle are heart-shaped or kidney-shaped at the base and straight to convex along the sides. The terminal bractlet is light green. The fruiting head is larger, up to 9 16 in diameter.

Tall thimbleweed (Anemone virginiana var. cylindroidea) is found in dry habitats. The petal-like sepals are shorter, usually 3 16 to long.


Distribution Distribution Map  

Sources: 4, 24, 28.


Comments

 


Taxonomy

Family:

Ranunculaceae (buttercup)

 

Subfamily:

Ranunculoideae

 

Tribe:

Anemoneae

 
Parent

tall thimbleweed (Anemone virginiana)

 
Synonyms

 

 
Common
Names

tall thimbleweed


 

 

 

 

 

 

 

 

Glossary

Achene

A dry, one-chambered, single-seeded fruit, 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.

 

Caudex

A short, thickened, woody, persistent enlargement of the stem, at or below ground level, used for water storage.

 

Involucre

A whorl of bracts beneath or surrounding a flower or flower cluster.

 

Peduncle

In angiosperms, the stalk of a single flower or a flower cluster; in club mosses, the stalk of a strobilus or a group of strobili.

 

Petiole

The stalk of a leaf blade or compound leaf that attaches the leaf blade to the stem.

 

Sepal

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

       

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Luciearl


  tall thimbleweed (var. alba)   tall thimbleweed (var. alba)

       
       

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Luciearl
10/9/2018

Location: Cass County

tall thimbleweed (var. alba)


     
     
 

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