question: Which type of plant has more species:  Mentha or Calodendrum?
answer: Mentha
context: Title: Calodendrum
  Passage: Calodendrum is a genus of medium-sized evergreen trees comprising two species from Africa. " Calodendrum capense" (Cape Chestnut) is a well known tree that is widely cultivated, while "Calodendrum eickii" is a rare forest tree from Tanzania.  The botanical name comes from Greek, "kalos" means beautiful and "dendrum" means tree.  Both species are harvested for their timber in Africa.
  Title: Mentha
  Passage: Mentha (also known as mint, from Greek "míntha", Linear B "mi-ta") is a genus of plants in the family Lamiaceae (mint family).  It is estimated that 13 to 18 species exist, and the exact distinction between species is still unclear.  Hybridization between some of the species occurs naturally.  Many other hybrids, as well as numerous cultivars, are known.
  Title: Mentha pulegium
  Passage: Mentha pulegium, commonly (European) pennyroyal, or pennyrile, also called squaw mint, mosquito plant and pudding grass, is a species of flowering plant in the Lamiaceae family, or mint family, native to Europe, North Africa, and the Middle East.  Crushed pennyroyal leaves emits a very strong fragrance similar to spearmint.  Pennyroyal is a traditional folk remedy, emmenagogue, abortifacient, and culinary herb.  European pennyroyal is related to an American species, Hedeoma pulegioides.  Though they differ in genera, they share similar chemical properties.
citations: Calodendrum Mentha