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..;
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;
Gazania page (Asteraceae (Compositae)) with images of species in efloraofindia : 1 post by 1 author.
If you find any mis-identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice. Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.