Cistus, with its many hybrids and cultivars, is commonly encountered as a garden flower. The common name rockrose is applied to the species, a name also shared by the related genera Halimium, Helianthemum and Tuberaria, all in the family Cistaceae. The common name gum cistus is applied to resin-bearing species, especially C. ladanifer.
Quasars are part of a class of objects known as active galactic nuclei (AGN). Other classes include Seyfert galaxies and blazars. All three require supermassive black holes to power them.
Hydrans were a non-humanoid species. Their government was the Hydran Kingdom. (Star Fleet Battles, Star Trek: Origins, RIS Bouteina: Humans, Romulans and Space-Beasts) Hydrans were notable to breathe methane, which could be uncomfortable or lethal for most Federation species.