Gazania ? Arctotis ?

[surajit koley]

Dear Friends,

This is in connection with the posts -

1. https://groups.google.com/d/msg/indiantreepix/Nh8yiwEcKts/iIJUSKrHcjYJ
   
2. https://groups.google.com/d/msg/indiantreepix/CZXJ_z24m-w/kTdZ3ycO93MJ
   

I have already placed my queries in those above mentioned posts. You might have noticed it too.

Gazania

Let's assume the above two linked plants are Gazania. The Plant List has several species from the genera. My concern is only two, because all i could gather some info is based on the following two species -

Gazania linearis (Thunb.) Druce

Gazania rigens (L.) Gaertn.

• typically forming a rosette of foliage = Gazania linearis (Thunb.) Druce
  
• a tender perennial that features decumbent stems that spread along the ground = Gazania rigens (L.) Gaertn.
  
• cauline leaves can be found = Gazania rigens Moench = please note the synonyms and/or basionym (do i sound expert? he he he!)
• leaves can be lobed in both the species - http://www.efloras.org/object_page.aspx?object_id=57368&flora_id=1 and http://www.kew.org/plants-fungi/Gazania-linearis.htm
• glabrous (not hairy) on the upper surface, but the undersides are thickly covered with soft, white hairs, except around the midrib = Gazania linearis (Thunb.) Druce = you can see this feature in at least two images in my post
  
• ray florets with dark abaxial stripe = Gazania linearis (Thunb.) Druce = you can see the feature in one of my images
• central dark spots and patches in ray florets = Gazania linearis (Thunb.) Druce = 1) http://florabase.dec.wa.gov.au/browse/profile/16311 2) http://keyserver.lucidcentral.org/weeds/data/03030800-0b07-490a-8d04-0605030c0f01/media/Html/Gazania_linearis.htm 3) http://www.kew.org/plants-fungi/Gazania-linearis.htm
• Gazania rigens (L.) Gaertn. - http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/plant-finder/plant-details/kc/a517/gazania-rigens.aspx
  

Arctotis fastuosa Jacquin

1. http://plantillustrations.org/species.php?id_species=80906
   
2. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066098
   

Please, gift me your views.

Thank you

Regards

[J.M. Garg]

Forwarding again for any assistance in the matter please.

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[Gurcharan Singh]

Surajit ji

The telling difference between Gazania and Arctotis is the outer involucre bracts which form a tube in Gazania whereas they are usually free or slightly united at base only.

As for three species of Gazania under discussion, they are described under two different species in both books by Bailey. 

Bailey (Manual of cultivated Plants) described B. longiscapa DC., considered as synonym of G. linearis (Thunb.) Druce in Hortus third as well as in Plant List.

Similarly G. splendens Moore is considered as synonym of G. ringens R. Br. in both books by Bailey and the Plant List.

G. ringens: stem distinct, with 15-30 cm long ascending branches; heads 6-8 cm across, on 10-15 cm long 

                  peduncles; teeth of involucre much shorter than tube, linear and acute; leaf margin not revolute.

G. linearis: Stem absent or very short; heads 4-7 cm across on up to 35 cm long scapes; teeth of involucre 

                 as long as or linger than tube, linear-subulate and very finely pointed; leaf-margins mostly revolute..

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[surajit koley]

Thank you Sir, i am adding this thread to the "key". Garg Sir, thank you.

Regards,

surajit