Which is in the grass family, Pachypodium or Arrhenatherum?
Arrhenatherum Arrhenatherum, commonly called oatgrass or button-grass, is a genus of Eurasian and North African plants in grass family.
Brachypodium pinnatum Brachypodium pinnatum, the heath false brome or tor-grass, is a plant in the grass family, with a widespread distribution in temperate regions of the Northern Hemisphere. It typically grows in calcareous grassland, and reaches 70 – tall. The flowerhead is open, with 10 to 15 erect spikelets.