Which of the two plants, Macropidia or Hippophae, is the sole species of its kind?
Macropidia: Macropidia fuliginosa, the sole species of genus Macropidia, is a perennial rhizomatous flowering plant. Hippophae: Hippophae is a genus of sea buckthorns, deciduous shrubs in the family Elaeagnaceae.
Macropidia