its probably too late for the seeds to actually mature .. this late in fall in your z6 .... so you might have all winter to find the info you need ...

i googled : thunbergia anatomical drawing

to get to the link below ....

good luck

ken

Here is a link that might be useful: second set down.. click on the right part .... be the bee

The difficulty is not in the pollinating, but in the collecting. Bees and other insect pollinators are perfectly able to take care of pollen transfer, aren't you glad? It's a simple matter of picking up ripe pollen from the anthers and transferring it to the stigmatic surface of another flower. Bees and others are best suited for this job, because they know when the male and female parts are ready for this transaction.

Anyway, the fabulous Mr. GreenThumb has a blog that explains the seed collecting process as well as anything I've seen. Great pictures and a video, to boot. You might have some seeds on your vine now that could be getting ready to harvest. You'll know what to look for after you look at the pictures/video.

Here is a link that might be useful: Thunbergia seed collecting

Mr. BrownThumb, not greenthumb.