They started off the same time.

lady's finger
also known as Okra, or Bendi (Bahasa Malaysia)

lady's finger flowering.

roselle, still waiting
I am sure you can see a part of the twining plant kacang kelisa 
or kacang botol or winged bean. Roselle plants are very close to winged beans trellis. 
A branch is adventurous enough to stray and find roselle.

I did a post earlier about the confusion while transplanting them on vegetable bed [click here: Roselle with lady's fingers in the middle]. They look awfully similar at the early age. Having them in a row, lady's finger in the middle flanked by roselle on both sides, makes them even more identical, to the point that even Kakdah didn't realise there is lady's finger in the middle until the day lady's finger sprouts nice flashy yellow bloom.
So Lady's Finger chooses to be the first to produce flowers and fruits.
Roselle plants  are waiting for the right moment to show off their lovely flowers. I guess Roselle is planning a real big surprise.

bangchik