black-eyed Susan

(Rudbeckia hirta var. pulcherrima)

               
Conservation Status

IUCN Red List

not yet assessed

black-eyed Susan

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACU - Facultative upland

Midwest

FACU - Facultative upland

Northcentral & Northeast

FACU - Facultative upland

Nativity

Native

 
Occurrence

Common

 
Habitat

Dry to wet. Prairies, forest openings, roadsides, disturbed areas. Full to partial sun.

 
Flowering

June to October

     
Flower Color

Yellow ray florets, brown disk florets

     
Height

12 to 36

     

Identification

This is a 12 to 36 tall, erect, biennial or short-lived perennial forb that rises on one to several stems usually from a taproot, sometimes from only fibrous roots.

The stems are erect, usually branched mostly above the middle, ridged, and sparsely to densely covered with short, spreading to ascending hairs. They are not glaucous.

Stem leaves are alternate. Basal and lower stem leaves are on long, winged leaf stalks. They are inversely lance-shaped, tapered or angled at the base, and rounded or tapered to a blunt point at the tip. They are 2 to 11¾ long, ¼ to 1¼ wide, 3 to 5 times as long as wide. The upper and lower surfaces are sparsely to moderately hairy with spreading to loosely ascending hairs. They are usually rough to the touch and are not glaucous. The margins are usually untoothed but sometimes have widely spaced, fine, sharp, forward-pointing teeth. Basal and lower stem leaves are sometimes present at flowering.

Middle and upper stem leaves are stalkless or on short, winged leaf stalks. They are lance-shaped, egg-shaped, or elliptic, the uppermost almost linear, rounded or squared at the base, and rounded or tapered to a blunt point at the tip. They are ¾ to 8 long, and to 1½ wide. The upper leaves are clasp the stem at the base. The upper and lower surfaces are sparsely to moderately hairy with spreading to loosely ascending hairs. They are usually rough to the touch and are not glaucous. The margins are usually untoothed but sometimes have widely spaced, fine, sharp, forward-pointing teeth.

The inflorescence is a single flower head at the end of each stem and branch. Each flower head is on a hairy stalk that is up to of the plant height. The bracts at the base of the flower head are lance-shaped to linear, moderately to densely hairy, with moderate to dense spreading hairs on the margins.

The flower heads are 2 to 3 wide. There are 8 to 21 yellow ray florets and numerous brown disk florets. The disk is in the shape of a flattened cone. The flower heads are not fragrant.

The fruit is a dry, black, oblong, 4-angled, 1 16 to long cypsela with no fluffy tuft of hairs attached.

 
Similar
Species

Brown-eyed Susan (Rudbeckia triloba var. triloba) is a bushy plant with smaller flower heads. The flower heads have no more than 15 ray florets. At least some of the larger leaves are 3- lobed. Basal and lower stem leaves are often absent at flowering time.


Distribution Distribution Map   Sources: 2, 3, 4, 5, 7, 28.

Comments

This is the state flower of Maryland.


Taxonomy

Family:

Asteraceae (aster)

 

Subfamily:

Asteroideae

 

Supertribe:

Helianthodae

 

Tribe:

Heliantheae (sunflower)

 

Genus:

Rudbeckia

 

Section:

Rudbeckia

 
Synonyms

Rudbeckia hirta var. corymbifera

Rudbeckia hirta var. lanceolata

Rudbeckia hirta var. sericea

Rudbeckia hirta var. serotina

Rudbeckia longipes

Rudbeckia sericea

Rudbeckia serotina

Rudbeckia serotina var. corymbifera

Rudbeckia serotina var. lanceolata

Rudbeckia serotina var. sericea

 
Common
Names

black-eyed Susan

blackeyed Susan


 

 

 

 

 

 

 

 

 

Glossary

bract

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

 

clasping

Describing a leaf that wholly or partly surrounds the stem but does not fuse at the base.

 

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.

 

glaucous

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

 

winged leaf stalk

A leaf stalk with a leaf-like or membrane-like extension along both sides.

       

Visitor Photos

   
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Wayne Rasmussen


  black-eyed Susan    

       
       
       

MinnesotaSeasons.com Photos

   

Plant

  black-eyed Susan   black-eyed Susan
       
  black-eyed Susan    
       

Flower Head

  black-eyed Susan   black-eyed Susan
       

Bud

  black-eyed Susan   black-eyed Susan
       

Stem

  black-eyed Susan    
       
       

 

Camera

     

Slideshows

   
  Rudbechia hirta
Susanne Wiik
 
  Rudbechia hirta  
 
About

Flekksolhatt

 
     
  Black Eyed Susan
DianesDigitals
 
  Black Eyed Susan  
 
About

Copyright DianesDigitals

 
     
  Black-eyed Susan (Rudbeckia hirta)
Andree Reno Sanborn
 
  Black-eyed Susan (Rudbeckia hirta)  
     
  Black-eyed Susan (Rudbeckia hirta)
Bill Keim
 
  Black-eyed Susan (Rudbeckia hirta)  
     
  Rudbeckia hirta BLACK-EYED SUSAN
Frank Mayfield
 
  Rudbeckia hirta BLACK-EYED SUSAN  

 

slideshow

     

Visitor Videos

   
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Other Videos

 
  Minnesota Native Plant - Black-Eyed Susan (Rudbeckia Hirta var. Pulcherrima)
MNNativePlants
 
   
 
About

Published on Jul 15, 2013

This video shows the common Minnesota native plant, Black-Eyed Susan (Rudbeckia Hirta var. Pulcherrima). A beautiful native that is commonly used in native and non-native plantings.

 
     
  Sweet Blackeyed Susan - Rudbeckia subtomentosa blooming at Ion Exchange
Ionxchange
 
   
 
About

Uploaded on Aug 1, 2011

Earthyman views Sweet Blackeyed Susan (Rudbeckia subtomentosa) blooming at Ion Exchange in Northeast Iowa in July http://www.ionxchange.com

 
     
  Rudbeckia flower time lapse Carol's
Neil Bromhall
 
   
 
About

Uploaded on Sep 2, 2009

Time-lapse Rudbeckia flower.
Filmed by Neil Bromhall for www.rightplants4me.co.uk

 
     

 

Camcorder

         

Visitor Sightings

   
Share your sighting of this plant.

Wayne Rasmussen
6/25/2016

Location: Oxbow Park & Zollman Zoo

black-eyed Susan


     
     
 

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