This is a good place to record tips, warnings, notes, times, advice, explanations, etc., on seed collection.
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Ruellia humilis
Sometimes I'm not so bright, and it took me a couple years to figure out how this one works. The story of discovery would be long, but it would suffice to say that it involves mice, a cupboard and a table top.
Seeds of this species must be gathered long before the pod dries. The slightest hint of brown signals seeds inside are ripe, and those pods that are even more green than in the photo above will have ripe seeds, too. I had to really dig hard with my thumbnail to open the pod shown, but as you can seed the seeds are ready.
Seed needs to be gathered at this stage because these are ones that dehisce with explosive power. I can imagine these tiny disc shaped seeds flying out like miniscule frisbees to places unknown. Store gathered pods in a paper bag or a loosely covered bowl to allow for rapid drying and containment of subsequent explosions.