Diario de catchang

https://www.researchgate.net/profile/James_Pringle3/publication/232695250_The_Identity_and_Nomenclature_of_the_Pacific_North_American_Species_Zeltnera_muhlenbergii_Gentianaceae_and_its_Distinction_from_Centaurium_tenuiflorum_and_Other_Species_with_Which_it_Has_Been_Confused/links/54d382ea0cf25017918234d9/The-Identity-and-Nomenclature-of-the-Pacific-North-American-Species-Zeltnera-muhlenbergii-Gentianaceae-and-its-Distinction-from-Centaurium-tenuiflorum-and-Other-Species-with-Which-it-Has-Been-Confused.pdf?origin=publication_detail

While this is becoming the clearing house for Zeltnera, here is a set of range maps for the genus. Z. davyi not included.
http://bonap.net/Napa/TaxonMaps/Genus/County/Zeltnera