purple giant hyssop

(Agastache scrophulariifolia)

Conservation Status
purple giant hyssop
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

SNR - Unranked

     
  Minnesota

not listed

     
           
           
 
Description
 
 

Purple giant hyssop is a 36 to 60 tall, erect, late-flowering perennial forb that rises from a rhizome.

The stems are erect, obtusely 4-angled, diamond-shaped in cross section, and branched above the middle. They are usually tinged purple. They have a sparse to dense covering of short, soft, downward-curved hairs along the ridges.

The leaves are opposite, mostly thin, egg-shaped to oblong egg-shaped, 2 to 5 long, and up to 2 wide. Lower leaves are on leaf stalks up to 2 long. The leaf stalks are usually covered with short, soft hairs, sometimes covered with long, soft, shaggy, unmatted hairs. The leaves become only slightly smaller and the leaf stalks only slightly shorter as they ascend the stem. Lower leaf blades are rounded to almost heart-shaped at the base and tapered to a point at the tip with straight or concave sides along the tip. Upper leaf blades are tapered at the base. The upper leaf surface is green and either hairless or covered with short, soft hairs. The lower surface is green, not white, and may be hairless or covered with long, soft, shaggy, unmatted hairs. The margins are coarsely toothed with sharp, forward-pointing teeth. The leaves emit a strong, anise-like odor when crushed.

The inflorescence is a dense spike at the end of the stems and branches. The spikes are usually continuous, sometimes interrupted, up to 6 long, and to ¾ wide, including the corollas. The flowers are arranged in dense whorls that are subtended by hairless, broadly egg-shaped, abruptly tapered, inconspicuous bracts.

The individual flowers are about ½ long. There are 5 green sepals fused onto a ¼ to long calyx tube with 5 lance-shaped or triangular lobes. The calyx is hairless. There are 5 petals fused into a funnel-shaped corolla tube with a 2-lobed upper lip and a 3-lobed lower lip. The corolla is often white, sometimes pale pink to purple, and extends well beyond the calyx. There are 4 stamens with purple anthers that protrude well beyond the corolla. The sepals that remain on the spike after the corollas have dropped off are green or whitish, not purple.

The fruit is a more or less 3-sided nutlet.

 
     
 

Height

 
 

36 to 60

 
     
 

Flower Color

 
 

White or pale pink to purple

 
     
 

Similar Species

 
  Blue giant hyssop (Agastache foeniculum) is a much shorter plant, reaching only 36 in height at maturity. The underside of the leaf is whitish due to a covering of microscopic white hairs. The flowers are blue. The sepals that remain on the spike after the corollas have dropped off are purple.  
     
 
Habitat
 
 

Dry. Upland woods and thickets. Partial sunlight.

 
     
 
Biology
 
 

Flowering

 
 

August to September

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  7/21/2019      
         
 

Nativity

 
 

Native

 
         
 

Occurrence

 
 

 

 
         
 
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

Lamiaceae (mint)  
  Subfamily Nepetoideae  
  Tribe Mentheae  
 

Subtribe

Nepetinae  
  Genus Agastache (hyssop)  
       
 

Synonyms

 
 

Agastache scrophulariifolia var. mollis

Lophanthus scrophulariaefolius

 
       
 

Common Names

 
 

figwort giant-hyssop

purple giant hyssop

purple giant-hyssop

 
       

 

 

 

 

 

Glossary

Bract

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

 

Calyx

The group of outer floral leaves (sepals) below the petals, occasionally forming a tube.

 

Corolla

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

 

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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Plant

  purple giant hyssop   purple giant hyssop
       

Inflorescence

  purple giant hyssop   purple giant hyssop
       
  purple giant hyssop   purple giant hyssop
       

Flowers

  purple giant hyssop   purple giant hyssop
       
  purple giant hyssop    
       

Leaves

  purple giant hyssop   purple giant hyssop
       

Stem

  purple giant hyssop   purple giant hyssop
       
  purple giant hyssop   purple giant hyssop
       
       

 

Camera

     
 
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Other Videos
 
  Plant 27
Derelict Drifter
 
   
 
About

Published on Aug 20, 2012

This looks like it may be a Agastache scrophulariifolia. I'm not sure though.

   
       

 

Camcorder

 

 

Binoculars


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