Which of these names is a genus of plant that consists of grass species:  Poa or Gymnocladus?
Gymnocladus Gymnocladus (Neo-Latin, from Greek γυμνὀς, "gymnos", naked + κλάδος, "klados", branch) is a small genus of leguminous trees. The common name coffeetree is used for this genus.
Pouzolzia Pouzolzia is a genus of flowering plants in the nettle family. There are about 35 species distributed throughout the tropical world. Most are shrubs, and some are herbs. The genus was named for French botanist and plant collector Pierre Marie Casmir de Pouzolz (1785–1858).