Question: Coryphantha and Solenopsis, are types of what?

Context paragraphs:
Solenopsis (plant): Solenopsis is a genus of plants in the Campanulaceae.  It is native to the Mediterranean region from Portugal and the Canary Islands east to Turkey.

Coryphantha: Coryphantha (from Greek, "flowering on the top"), or beehive cactus, is a genus of small to middle-sized, globose or columnar cacti.  The genus is native to arid parts of Central America, Mexico, through Arizona, New Mexico, and western Texas and north into southwestern, central, and southeastern Montana.  With its two subgenera, 57 species and 20 subspecies, it is one of the largest genera of cactus.

Supporting paragraphs: Coryphantha Solenopsis (plant)
Answer: plants