Houstonia rubra explained

Houstonia rubra, the red bluet, is a plant species in the Rubiaceae.^[1] It is a small herb with white to pink to red to reddish-purple flowers, native to the southwestern United States and northern and central Mexico: Coahuila, Nuevo León, Hidalgo, Zacatecas, Guanajuato, Puebla, Sonora, Durango, Chihuahua, Arizona, New Mexico, southeastern Utah and western Texas.^{[2] [3] [4] [5]}

Notes and References

1. Cavanilles, Antonio José. 1799. Icones et Descriptiones Plantarum 5: 48, pl. 474, f. 1.
2. Web site: World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew.
3. http://bonap.net/MapGallery/County/Houstonia%20rubra.png
4. http://swbiodiversity.org/seinet/taxa/index.php?taxon=224 Southwest Environmental Information Network
5. http://eol.org/pages/1111511/maps Encyclopedia of Life