false boneset

(Brickellia eupatorioides var. corymbulosa)

Conservation Status
false boneset
  IUCN Red List

not listed

     
  NatureServe

NNR - Unranked

SNR - Unranked

     
  Minnesota

not listed

     
           
           
 
Description
 
 

False boneset is an erect, annual biennial perennial forb that rises on one or a cluster of 2 to several stems from a deep taproot. It is usually 12 to 32 tall, sometimes taller. The taproot can reach up to 16 deep.

The stems are erect, round, and branched near the top. They are densely covered with short, curly hairs. They do not have spines or prickles. They are green when young, often becoming brown and woody with age.

Basal leaves are usually absent at flowering time. When present, they are no larger than the lower and middle stem leaves. Stem leaves are alternate, numerous, and densely crowded, sometimes appearing opposite or whorled. Lower leaves are on leaf stalks that are up to 3 16 long. The main leaves are lance-shaped, 1 to 3½ long, and 3 16 to wide. The blades are tapered at the base and taper to a sharp point at the tip. The upper surface is hairless or sparsely hairy and has scattered glands. The lower surface is sparsely to moderately covered with short, fine hairs, at least along the veins, and moderately to densely covered with glands. The margins are untoothed or have one to a few coarse teeth. The leaves become gradually smaller and shorter stalked as they ascend the stem. Upper leaves are stalkless.

The inflorescence is a small, branched, flat-topped or rounded cluster (panicle) of mostly 3 to 8 flower heads at the end of the stem and branches. The flower heads are to ½ wide and are held erect or ascending on 3 16 to long stalks.

The whorl of bracts at the base of the flower head (involucre) is narrowly cup-shaped and 5 16 to long. The base of the involucre is not swollen. There are 22 to 26 bracts in 4 to 6 overlapping series. The middle and outer series of bracts are half as long or less than the inner series. They taper to a sharp point but not to a hairlike tip.

There are no ray florets and 15 to 35 disk florets. Each disk floret is cream-colored, narrowly tubular, and divided at the tip into 5 short, ascending to spreading lobes. A white, forked style protrudes from the floral tube well beyond the lobes.

The fruit is a dry cypsela with white, feathery hairs attached. The cypsela is brown to dark brown, to 3 16 long, and has 10 longitudinal ribs.

 
     
 

Height

 
 

12 to 32

 
     
 

Flower Color

 
 

Cream-colored

 
     
 

Similar Species

 
 

American burnweed (Erechtites hieraciifolius var. hieraciifolius) stem is angled, not round. Middle and upper stem leaves are lobed. The leaf margins are sharply toothed. The involucre is conspicuously swollen at the base.

Tall boneset (Eupatorium altissimum) leaves are opposite and well spaced, not crowded.

 
     
 
Habitat
 
 

Dry to moderate moisture. Prairies, savannas, forest openings, river banks, streambanks. Full sun.

 
     
 
Biology
 
 

Flowering

 
 

August to October

 
     
 
Use
 
 

 

 
     
 
Distribution
 
 

Distribution Map

 

Sources

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

 
  9/4/2020      
         
 

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

Asterales (sunflowers, bellflowers, fanflowers, and allies)  
 

Family

Asteraceae (sunflowers, daisies, asters, and allies)  
  Subfamily Asteroideae  
  Supertribe Helianthodae  
  Tribe Eupatorieae (bonesets, blazingstars, and allies)  
  Subtribe Alomiinae  
 

Genus

Brickellia (brickellbush)  
  Species Brickellia eupatorioides (false boneset)  
       
 

Subordinate Taxa

 
 

 

 
       
 

Synonyms

 
 

Kuhnia eupatorioides var. corymbulosa

Kuhnia hitchcockii

 
       
 

Common Names

 
 

brickellbush

Brickell-bush

false boneset

falseboneset

 
       

 

 

 

 

 

Glossary

Bract

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

 

Cypsela

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 from the wall of the inferior ovary and also from other tissues derived from the receptacle or hypanthium, does not split open at maturity, but relies on decay or predation to release the contents.

 

Involucre

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

 

Panicle

A pyramidal inflorescence with a main stem and branches. Flowers on the lower, longer branches mature earlier than those on the shorter, upper ones.

       
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Plant

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Inflorescence

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Flower Heads

  false boneset   false boneset
       

Leaves

  false boneset    
       
       

 

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