thanks for comments daniel.
you are right, they are all d. viridis. at the beginning i was a little confused because their colors are so different in so close plants, but my brazilian forum friends help with id. the first 4 pics shows d. viridis in a 4 meters tall gorge along the road with no water running, except when there's rain, it seems that they are exposed to more sunlight too. the other 2 pics shows the plants about 50 meters far growing along a shallow stream in a much more humid place, but with less sunlight. the soil seems to be the same. i notice too that plants that grow in secon