I went for a short hike on a local mountain top in a private reserve. I have pretty much exhausted all the cactus photos as it seems only E. crenatum lives there so I snapped some peperomia photos. I do not have species names as there are supposedly 60 plus species in the country and I do not have a good literature source for them. One forest photo is included to give an idea of the habitat at about 1500 meters in the rainy season.
I have 3 native species growing in my garden in hanging baskets and wall planters. They make good low maintain garden plants as their generally thick waxy leaves make them easy to care for year round.
The first two appear to be Peperomia obtusifolia or P. magnoliifolia - there seems to be some controversy about whether these are the same species or two different, similar species. See: https://www.google.com/url?sa=t&rct=j&q ... CC1ocA6_2T
In either case, they're commonly sold as houseplants (or as garden plants in Florida, where P. obtusifolia grows wild). As you say, they're low maintenance, easy to grow.
This is another one, possibly the same as one of these, that I found in another mountain range. There are several species sold in local nurseries unlabelled but I don not know if they are natives or exotics.. I am trying to cultivate the unknown ones that I find on hikes.
MOBOT shows 67 species in Nicaragua on Tropicos.com
Always looking to expand my collection! 
