planyspa lujvo

x₁ is a succulent (plant) of species/cultivar x₂.

For "cactus", see jesyspa.

lensisku

In notes:

adgaue: x₁ is an agave of species/breed/variety x₂.
sparalo'e: s₁ is an aloe plant (genus Aloe) of species/strain/cultivar s₂ (default Aloe vera).
xomxeci: x₁ is an ocotillo of species x₂