title: Houstonia acerosa
text: # Houstonia acerosa
  
  Houstonia acerosa, the New Mexico bluet or needleleaf bluet, is a plant species native to Chihuahua, Coahuila, Nuevo León, Tamaulipas, San Luis Potosí, Texas and New Mexico.
  
  Houstonia acerosa is an herb up to 20 cm tall, with narrow needle-like leaves and white or purplish flowers.
  
  ## Varieties
  
  Three varieties of the species are widely accepted:
  
  * Houstonia acerosa var. acerosa - Coahuila, Nuevo León, Tamaulipas, San Luis Potosí, Texas
  * Houstonia acerosa var. polypremoides (A.Gray) Terrell - Chihuahua, Coahuila, New Mexico, trans-Pecos Texas
  * Houstonia acerosa var. tamaulipana (B.L.Turner) Terrell - Tamaulipas
  