Hardest plants to identify?

[Koen G]

I'm not sure if I'd say those two ovoid shapes are drawn by the same artist for sure. They are clearly related, and one must have seen the other. But stylistically, there are some differences. For example: 

• The little crescent shapes in the plant float in the center, while those in the rosettes are connected to the inner rim.
  
• The rosettes has an extra pair of yellow "lips" between the small crescents and the petals. 
  
• In the plant, the petals are doubled, while in the rosettes, they are similar.
  

Of course, these are different contexts, which could explain these differences, but this makes it also hard for us to determine whether these were done by the same artist. What seems stylistic may also be prompted by context, and vice versa.