I sometimes look at people’s posts that I follow on tumblr and an interesting concept came up within’ needing a flower to ID. a plant properly from a fellow named @cactusmandan. It is highly true that a flower with a good macro shot of the corona can be extremely necessary when plants are two similar in morph.
The following can be a visual aid for this concept. Please take note of coronal elements (they are highly unique and are what gives away each sp. in concept.)
Huernia arabica / Photographed by: Bert Polling
Huernia macrocarpa var. penzigii / Photographed by: Luiza Ferreira
Huernia saudi-arabica/ Photographed by: Luiza Ferreira
Huernia keniensis var. keniensis /Photographed by: Tim Peatling
Huernia keniensis/ Photographed by: Luiza Ferreira