Houstonia wrightii, the pygmy bluet, is a plant species in the Rubiaceae. It is native to the south-western United States (Arizona, New Mexico, western Texas) and northern Mexico (Chihuahua, Sonora, Hidalgo). References External links Northern Arizona Flora Vascular Plants of the Gila Wilderness Gardening Europe Intermountain Region Herbarium Network wrightii Flora of Arizona Flora of New Mexico Flora of Chihuahua (state) Flora of Sonora Flora of Hidalgo (state) Flora of Texas Plants described in 1882