showy goldenrod

(Solidago speciosa var. rigidiuscula)

Conservation Status
showy goldenrod (var. rigidiuscula)
  IUCN Red List

not listed

     
  NatureServe

N5? - Secure

SNR - Unranked

     
  Minnesota

not listed

     
           
           
 
Description
 
 

Showy goldenrod (var. rigidiuscula) is a 8 to 60 tall, erect, perennial forb that rises on 1 to 5 stems from a stout, woody caudex in mature plants, from rhizome in young plants. It tends to form clumps.

The stems are erect, leafy, green or reddish, hairless from the base to the inflorescence, and minutely hairy in the inflorescence.

Basal and stem leaves are dark green and are not glaucous. Stem leaves are alternate, rough to the touch, crowded, and firm. Basal and lower stem leaves are narrow, inversely lance-shaped or inversely egg-shaped, with the attachment at the narrow end. Basal leaves are 2 to 12 long including a short leaf stalk, and to ¾ wide. The margins are often coarsely toothed.They are usually not present at flowering. The upper surface is almost hairless. Middle stem leaves are narrowly egg-shaped to lance-shaped or elliptic, 1 to 3½ long, and to wide, becoming smaller as they ascend the stem. They are attached to the stem without a leaf stalk. The margins on the middle leaves are finely toothed, becoming untoothed near the top of the stem. The upper surface is hairless and smooth to the touch. On the upper half of the plant small, wing-like leaves appear in the leaf axils.

The inflorescence is a dense, 4 to 12 long, 1 to 3½ wide spike with 15 to 300 flower heads. The flowering stems of the inflorescence curve upward rather than out and down.

The flower head is about ¼ wide with 6 to 8 yellow ray florets and 7 to 9 yellow disk florets.

 
     
 

Height

 
 

8 to 60

 
     
 

Flower Color

 
 

Yellow ray flowers, yellow disk flowers

 
     
 

Similar Species

 
 

The 12, showy flower spike makes showy goldenrod one of the more easily recognized goldenrod species.

Showy goldenrod (Solidago speciosa var. speciosa) has much wider leaves. Basal leaves are usually present at flowering. The stem leaves are smooth to the touch, not crowded, and not firm.

 
     
 
Habitat
 
 

Dry to moderate moisture. Open woods, fields, prairies, and plains. Full sun. Sandy or loamy soil.

 
     
 
Ecology
 
 

Flowering

 
 

Late July or early August to early October

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

4, 7.

 
  6/26/2019      
         
 

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 (dicots)  
  Superorder Asteranae  
 

Order

Asterales (sunflowers, bellflowers, fanflowers, and allies)  
 

Family

Asteraceae (sunflowers, daisies, asters, and allies)  
  Subfamily Asteroideae  
  Supertribe Asterodae  
  Tribe Astereae (asters and allies)  
  Genus Solidago (goldenrod)  
  Section Solidago  
  Subsection Squarrosae  
  Species Solidago speciosa (showy goldenrod)  
  Subspecies Solidago speciosa ssp. speciosa (showy goldenrod)  
       
 

Based on a recent study (Semple et al. 2017), Plants of the World Online (POWO) elevated this variety to species level with the name stiff-leaved showy goldenrod (Solidago rigidiuscula). It is widely expected that other taxonomic authorities will soon do the same, but as of this writing (3/21/2021) they have not.

 
       
 

Subordinate Taxa

 
 

 

 
       
 

Synonyms

 
 

Solidago rigidiuscula

 
       
 

Common Names

 
 

showy goldenrod

stiff-leaved showy goldenrod

 
       

 

 

 

 

 

Glossary

Axil

The upper angle where the leaf stalk meets the stem.

 

Caudex

A short, sometimes woody, persistent stem, at or below ground level, from which aerial stems arise each year.

 

Glaucous

Covered with a whitish, waxy coating, as on a plum or a grape.

 

Rhizome

A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.

       
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Habitat

  showy goldenrod (var. rigidiuscula)   showy goldenrod (var. rigidiuscula)
       
  showy goldenrod (var. rigidiuscula)    
       

Plants

  showy goldenrod (var. rigidiuscula)    
       

Plant

  showy goldenrod (var. rigidiuscula)   showy goldenrod (var. rigidiuscula)
       
  showy goldenrod (var. rigidiuscula)    
       

Inflorescence

  showy goldenrod (var. rigidiuscula)   showy goldenrod (var. rigidiuscula)
       

Flowers

  showy goldenrod (var. rigidiuscula)    
       

Leaves

  showy goldenrod (var. rigidiuscula)    
       
       
       

 

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