Siskiyou aster

(Symphyotrichum lanceolatum ssp. hesperium)

Overview

 

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Symphyotrichum lanceolatum ssp. hesperium is a subspecies of the Symphyotrichum lanceolatum plant, commonly known as Siskiyou aster or western aster. This subspecies is native to western North America, particularly in California, Oregon, and Washington.

Symphyotrichum lanceolatum ssp. hesperium prefers full sun to partial shade and well-draining soil. It is often found in meadows, open woodlands, and along roadsides. In the mountain west it is also found in cordilleras.

 
           
 
Description
 
 

This subspecies is differentiated from ssp. lanceolatum by characteristics of the inflorescence. The flower heads are usually subtended by larger, broader, leaf-like bracts. The outer bracts of the involucre (phyllaries) are longer, more than two-thirds the length of the inner ones.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

3, 4, 28, 29, 30.

 
  3/5/2023      
         
 
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 Asteranae  
 

Order

Asterales (sunflowers, bellflowers, fanflowers, and allies)  
 

Family

Asteraceae (sunflowers, daisies, asters, and allies)  
  Subfamily Asteroideae  
  Supertribe Asterodae  
  Tribe Astereae (asters and allies)  
  Subtribe Symphyotrichinae  
  Genus Symphyotrichum (American asters)  
  Subgenus Symphyotrichum (common American asters)  
  Section Symphyotrichum (bushy, eastern, heart-leaved, and old field asters)  
  Subsection Dumosi (bushy asters)  
  Species Symphyotrichum lanceolatum (panicled aster)  
 

 

   
 

This and other asters were formerly place in the genus Aster. That genus was problematic, in that it did not include just one common ancestor with all of its lineal descendants and no others – it was not monophyletic. In 1994, the genus Symphyotrichum was resurrected to include most North American asters formerly in the genus Aster.

 
       
 

Subordinate Taxa

 
 

Siskiyou aster (Symphyotrichum lanceolatum var. hesperium)

 
       
 

Synonyms

 
 

Aster hesperius

 
       
 

Common Names

 
 

Siskiyou aster

western panicled aster

white panicle aster

 

 

 

 

 

 

 

Glossary

Bract

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

 

Involucre

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

 

Phyllary

An individual bract within the involucre of a plant in the Asteraceae family.

 
 
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