large-flowered beardtongue

(Penstemon grandiflorus)

Conservation Status
large-flowered beardtongue
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

SNR - Unranked

     
  Minnesota

not listed

     
           
           
 
Description
 
 

Large-flowered beardtongue is a 12 to 40 tall, erect, biennial or short-lived perennial forb that rises on usually a single stem, sometimes 2 or 3 stems, from a stout taproot.

In the first year it appears as a rosette of basal leaves. In the second year it sends up a flowering stalk.

The stems are erect, stout, unbranched, round in cross section, and hairless. They are pale grayish-green to bluish-green and are covered with a whitish, waxy coating (glaucous).

Basal leaves are stalked, thick, firm, grayish-green to bluish-green, egg-shaped to inversely egg-shaped, 2 to 5 long, and 1 to 3 wide. They are gradually tapered or rounded and abruptly tapered at the base, and are blunt or pointed at the tip. The upper and lower surfaces are hairless and glaucous. The margins are untoothed.

Stem leaves are opposite, stalkless, egg-shaped, 2 to 4 long, 1 to 2½ wide, rounded at the base, and otherwise similar to basal leaves. They become progressively shorter but not much narrower as they ascend the stem. Upper stem leaves are almost round and are shallowly heart-shaped and somewhat clasping at the base.

The inflorescence is an unbranched, elongated, 6 to 12 long, raceme-like cluster at the end of the stem. There are 3 to 9 opposite pairs of leaf-like appendages (bracts) in the inflorescence. The bracts are similar to upper stem leaves but much smaller, up to 1¼ long and ¾ wide. From the axil of each bract there rises usually 1, sometimes 2 or 3, large, short stalked, showy flowers.

Each flower has 5 sepals, 5 petals, 5 stamens, and 1 style. The sepals are green and ¼ to 7 16 long. They are fused at the base into a cup-shaped tube, then separated into 5 long, sharply pointed lobes. The lobes are longer than the tube. The petals (corolla) are purple or purplish-pink. They are fused at the base into a trumpet-shaped, 1 to 2 long tube with 5 rounded lobes. The lobes form 2 distinct lips, a 2-lobed upper lip and a 3-lobed lower lip. The tube is much longer than the lobes. There are dark purple lines within the corolla tube that act as nectar guides. The stamens are about as long as the corolla tube. Four stamens are fertile, one is sterile (staminode). The staminode is has yellowish hairs at the tip, which is the source of the common name beardtongue. The style is white. The individual flowers are short-lived but the blooming period lasts about 3 weeks from May to late June. They are not fragrant.

The fruit is an egg-shaped, to ¾ long seed capsule with numerous seeds. It is pale green at first, turning brown and woody as it matures.

 
     
 

Height

 
 

12 to 40

 
     
 

Flower Color

 
 

Pink

 
     
 

Similar Species

 
  No similar species  
     
 
Habitat
 
 

Dry. Prairies. Full sun. Sandy or rocky soil.

 
     
 
Biology
 
 

Flowering

 
 

May to late June

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  6/4/2015      
         
 

Nativity

 
 

Native

 
         
 

Occurrence

 
 

Widespread but not abundant

 
         
 
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

Lamiales (mints, plantains, olives, and allies)  
 

Family

Plantaginaceae (plantain)  
  Tribe Cheloneae  
  Genus Penstemon (beardtongue)  
       
 

Synonyms

 
  Penstemon bradburii  
       
 

Common Names

 
 

large beardtongue

large-flowered beardtongue

largeflowered penstemon

 
       

 

 

 

 

 

Glossary

Axil

The upper angle where a branch, stem, leaf stalk, or vein diverges.

 

Bract

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

 

Corolla

A collective name for all of the petals of a flower.

 

Glaucous

Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.

 

Raceme

An unbranched, elongated inflorescence with stalked flowers. The flowers mature from the bottom up.

 

Sepal

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

 

Staminode

A modified stamen that produces no pollen. It often has no anther.

       
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Plant

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  large-flowered beardtongue    
       

Inflorescence

  large-flowered beardtongue   large-flowered beardtongue
       
  large-flowered beardtongue    
       

Flower

  large-flowered beardtongue   large-flowered beardtongue
       
  large-flowered beardtongue    
       

Leaves

  large-flowered beardtongue    
       

Fruit

  large-flowered beardtongue   large-flowered beardtongue
       
  large-flowered beardtongue    
       
       

 

Camera

     
Slideshows
   
  Penstemon grandiflorus (Large Beardtongue)
Allen Chartier
 
  Penstemon grandiflorus (Large Beardtongue)  

 

slideshow

       
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Other Videos
 
  Minnesota Native Plant - Showy Penstemon (Penstemon Grandiflorus)
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About

Published on Jun 18, 2013

The Showy Penstemon, or Large-Flowered Beardtongue (Penstemon Grandiflorus) is the Minnesota native plant shown today. Thanks for viewing my native plant channel!

   
       

 

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