BLACK-EYED SUSAN

Rudbeckia hirta var. angustifolia

Daisy & Dandelion Family [Asteraceae]

month8jun month8june month8jul month8july month8aug month8sep month8sept month8oct month8nov

status
statusZneophyte
flower
flower8multicolour
flower
flower8yellow
flower
flower8red
flower
flower8brown
inner
inner8multicolour
inner
inner8beetroot
inner
inner8brown
inner
inner8yellow
morph
morph8actino
petals
petalsZMany petalsZ12
stem
stem8angular stem8ribbed stem8square stem8round
toxicity
toxicityZmedium

22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Flowers golden yellow with large inner portion a reddish-brown colour, deepening to almost black in the centre. Have a similar appearance to a bruised 'black-eye', hence the moniker. Petals about 12 in number.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Flowers very large, between 3.5 to 10cm across.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
An erect annual or short-lived perennial to 70cm high.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Inner radiant reddish area of petals is streaked towards the periphery.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
A ring of disc florets in the centre bear yellow pollen at the tips of the beetroot-coloured stamens. Inner disc florets beetroot coloured and forming a raised dome. Note snail on petal.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Rings of yellow pollen.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Petals of flower still to un-fold. Phyllaries are in two or three rows, initially roughly upright, fold back as the flower opens. They are covered in long white hairs and tipped brown. Stem here round.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Petals fully open, phyllaries folded down underneath.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Stem here ribbed.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
A cluster growing near each other.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Leaves narrowish and not opposite each other.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Leaves lanceolate, hairy and without stalks. Stem here square.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Here stems multi-faceted and angular. Leaves have white hairs clustered around the periphery.


22nd July 2013, a garden, Old Clough La, Walkden, Gtr M/cr. Photo: © RWD
Here stems square. White hairs have brownish glands at base. Leaves butt onto stems without stalks.


Not to be confused semantically with : another non-native plant with the same common name 'Black-eyed Susan' (Thunbergia alata) which is a climber with ace-of-spades shaped leaves like those of Bindweeds and yellow flowers with five petals and a deep well in the middle that looks black because it is so deeply set. Nor to be confused with Blue-eyed Grass (Sisyrinchium bermudiana) which is not a grass either.

Easily mistaken (especially in regard to the way that a certain once-popular but out-of-print botanical book draws Blanketflower) for : Blanketflower (Gaillardia × grandiflora) but that has ray florets that are deeply pinked into three large teeth at the periphery much like those of Sweet William (Dianthus barbatus) and the leaves are coarsely and dentately toothed on the sides (whereas the leaves of Black-eyed Susan are entire, lacking teeth.

Some similarities to the related : Hairy Rudbeckia [aka Bristly Coneflower] (Rudbeckia hirta) but that has an all-yellow corolla but a similar beetroot-coloured domed central 'cone'.

Black-eyed Susan is a garden plant that can escape into the wild, usually onto rough ground and waste places. The specimens here are yet to escape...

The stems appear to be very variable in cross-section, the above photos show round, multi-faceted, ribbed and square stems. All have long thin white hairs emerging from dark glands. Lanceolate leaves hairy too and lacking teeth.


  Rudbeckia hirta var. angustifolia  ⇐ Global Aspect ⇒ Asteraceae  

Distribution
 family8Daisy & Dandelion family8Asteraceae

 BSBI maps
genus8Rudbeckia
Rudbeckia
(Coneflowers)

BLACK-EYED SUSAN

Rudbeckia hirta var. angustifolia

Daisy & Dandelion Family [Asteraceae]