Euphorbiaceae Week: Euphorbia pseudograntii from Delhi

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Gurcharan Singh

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Mar 11, 2011, 10:42:44 PM3/11/11
to efloraofindia

Euphorbia pseudograntii Bruyns,  Taxon 55:414. 2006

 syn: Synadenium grantii Hook. f.

A glabrous shrub cultivated in pots or beds in Delhi, evidently growing several feet tall along roadsides in South India.

Common Name: African milk bush

With the addition of this species the key to woody species would be revised as

Stems unarmed; without stipular spines
     All leaves of same colour 
          Leaves longer than 8 cm, green.............................................................................................E. pseudograntii
          Leaves up to 8 cm long
               Stem and leaves uniformly red, leaves in whorls of three, petiole almost as long as blade.......E. cotoniifolia
               Stem and leaves green, leaves alternate, petiole much shorter than blade
                     Leaves shorter than 2 cm, less than 2 mm broad, branches straight, mostly leafless
                                             (leaves early deciduous)......................................................................E. tirucalli
                      Leaves longer than 3 cm, more than 2 cm broad, branches zigzag, mostly with leaves.......E. tithymaloides
    All leaves not of same colour;  lower leaves green, upper partly or uniformally coloured; leaves longer than 8 cm 
               Leaves below the inflorescence uniformally coloured (red, white or yellow); leaves not lobed...E. pulcherrima
               Leaves below the inflorescence coloured only at base; leaves lobed or not
                    Base of upper leaves pale green or pale white; leaves lobed or not...............................E. heterophylla
                    Base of upper leaves red; leaves lobed......................................................................E. cyathophora
Stems armed with spines
     Spines borne on stem, usually longer than 1 cm; two showy bracts around cyathium...................E. milii
     Spines borne on raised shield, usually shorter than 1 cm, two showy bracts lacking                    
          Stem rounded, not angled or winged
               Shrub wiithout trunk with branches arising from base, smaller leaves (3-8 cm long)
                                                                                             and longer spines 0.5-1 cm.............E caducifolia
               Tree with distinct trunk, leaves 10-25 cm long, spines shorter than 0.5 cm........................E. nivulia).
          Stem angled or winged
                Angles not produced into wing, spirally arranged:....................................................... E. neriifolia
               Angles produced into wings
                    Wings 3-4
                          The wings running straight, sinuate, regularly dentate
                                             Stems green without white bands....................................................E. antiquorum
                                             Stems white wholly or partially
                                                        The stems with white bands on faces
                                                              Apex of stem not cristate (without crowns at tips)...........E. lactea
                                                              Apex of stem cristate (with crowns at tips)......................E lactea cv. Cristata           
                                                       The  stems uniformly greyish white...................................... ...E. lactea cv. White Ghost     
                         The wings running spirally, ...................................................................................E. tortilis 
                 Wings 5-6, undulate.....................................................................................................E. royleana
                       

--
Dr. Gurcharan Singh
Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Phone: 011-25518297  Mob: 9810359089
http://people.du.ac.in/~singhg45/

Synadenium grantii Khalsa-Delhi-2.jpg
Synadenium grantii -Khalsa-Delhi-3.jpg
Synadenium grantii-Khalsa-Delhi-1.jpg

Rashida Atthar

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Mar 12, 2011, 12:42:58 AM3/12/11
to Gurcharan Singh, efloraofindia
Thankyou for posting one  more Euphrorbia Sir. There is a minor variation in the nomenclature as compared to Kew Plant List: Euphorbia pseudograntii Pax  is mentioned as the accepted name. Request your observations about the same. The type specimen does seem to match your plant.  
 
regards,
Rashida.

On Sat, Mar 12, 2011 at 9:12 AM, Gurcharan Singh <sing...@gmail.com> wrote:

Euphorbia pseudograntiitin Bruyns,  Taxon 55:414. 2006

Gurcharan Singh

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Mar 12, 2011, 1:37:24 AM3/12/11
to Rashida Atthar, efloraofindia
Rashida ji
Thanks for pointing out. I should have checked it earlier. Now according to my analysis the Correct name should be Euphorbia umbellata (Pax) Bruyns, because the author himself had made this correction in 2007, the name Euphorbia pseudograntii being already occupied by a totally different species E. pseudograntii Pax.

The Name for our plant should accordingly be:
Euphorbia umbellata (Pax) Bruyns, Euphorbia World 3: 5 2007.
syn: Euphorbia pseudograntii Bruyns (non Pax)  [Illegitimate]
       Synadenium grantii Hook.f.
       Synadenium umbellatum Pax

Accordingly in the key the name Euphorbia pseudograntii will be replaced by Euphorbia umbellata


Stems unarmed; without stipular spines
     All leaves of same colour 
          Leaves longer than 8 cm, green.............................................................................................E. umbellata

Rashida Atthar

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Mar 12, 2011, 2:05:33 AM3/12/11
to Gurcharan Singh, efloraofindia
Yes Sir, thankyou, this seem logical and correct.
 
regards,
Rashida.

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