There is some difficulty, especially with new tree owners, on how to identify a female Jackfruit flower. I originally was a tad bit frustrated on my inability to identify female vs male flowers on my first Jackfruit tree. Over time, I have learned how to identify the male vs female flowers with relative ease on my Bangkok Lemon ( seedling?) Jackfruit tree. It wasn't easy though when I was inexperienced with the tree.
Now I have a second tree fruiting. It is a seedling from a Jak I purchased at Robert is Here ( Black Gold?) a few years ago. The female flowers on this tree have a different physical appearance than my BL (S?) tree.
We know that females are more likely to be produced on thick stalks originating near a major limb or trunk. They also tend to have a "ring" around the neck of the flower. But males can also have these traits, depending on variety and maturity of the tree.
I am currently attempting to cross hand pollinate these two varieties in hopes of producing fruit with the highest fruit to rag content.
Maybe we should fill this thread with female flowers of different varieties. It might help those who are having difficulty in identifying flowers.
Bangkok Lemon (seedling?) Female Flower in the receptive stage. You can see the transition from stem to fruit is fairly gradual.
Now compare that to this Female Flower ( receptive) on my BG-S tree. Notice how abrupt the transition collar from stem to fruit is.
It is not so easy to see in the photo, but the BG-S Females have a very distinct lip at the stem/fruit transition. Nearly impossible to miss when seen in person. Much different than the males.