1) Rock plant 2) Saxicoline 3) Saxicolous 1) Saxicoline 2) Saxicolous 
rock-dwelling
• (a.) Of or pertaining to rocks; living among rocks; as, a saxatile plant.
growing among rocks or in rocky, arid situations
growing among rocks or in rocky, arid situations
Sax'a·tile adjective [ Latin saxatilis , from saxum a rock: confer French saxatile .] Of or pertaining to rocks; living among rocks; as, a saxatile plant. 
saxatile Living or growing among rocks.