Grass

I mean, it's grass.
Grass is just grass, unless otherwise stated. It first entered the Static Map when the original Spheres were relocated from Faunasphere, found on a countless number of Grass Blocks. Okay, it's not actually countless, just I (Viirin) don't want to count them. It can also be found on Xanthe 3.
Grass in the Static Map (not genetically related, at least not yet):
Grass from Faunasphere: All spheres currently, past, and future.
Grass from StarBound: Xanthe 3.