Which is in the grass family, Pachypodium or Arrhenatherum?
Pachypodium Pachypodium is a genus of succulent spine-bearing trees and shrubs, native to Madagascar and Africa. It belongs to the dogbane family, Apocynaceae. "Pachypodium" comes from a Latin form from Greek "pachus" (thick) and "podion" (foot) (or Gk podos, root form of pous, foot), hence meaning "thick-footed".
Rumex hydrolapathum Rumex hydrolapathum Huds. (great water dock; water dock; giant water dock) is a species of perennial herbaceous plants in the genus "Rumex" native to fens and freshwater banks of Europe and Western Asia. It is the tallest species in the genus, with flowering stems attaining a height of up to 2 m . It is one of the small number of decaploid organisms, containing two hundred individual chromosomes.