You’re looking at a Central American member of the Physiruellia, which is most diverse / best represented in western South America. It isn’t the most distinctive species in the world… looks a bit like Ruellia stemonacanthoides, but with smaller fruits.

With some reluctance, and based on evidence available to us at the time, Lucinda and I synonymized Ruellia tonduzii with R. pittieri (McDade & Tripp 2007, Brittonia). Future workers may choose to undo that.

I’ve seen this species a couple of times in the field (Costa Rica), but both instances resulted in crappy photographs. Here’s a slightly better one from… Ricardo, I think?

Wild collected, Kriebel (voucher unknown, NY); Photo by Ricardo Kriebel