Genus of plants
Johnstonella is a genus of flowering plants belonging to the family Boraginaceae.
Its native range is south western and southern US to Mexico, Peru to southern South America. It is found in the American states of Arizona, California, Nevada, New Mexico, Texas and Utah, as well as in the countries of Argentina, Chile, Mexico and Peru.
Taxonomy.
The genus name of "Johnstonella" is in honour of Ivan Murray Johnston (1898–1960), an American botanist. 
It was first described and published by August Brand in Repert. Spec. Nov. Regni Veg. Vol.21 on page 249 in 1925.
Then in 1927, Ivan M. Johnston wrote that the genus of "Oreocarya" (in the Boraginaceae family) could be combined with "Cryptantha".
Then Edwin Blake Payson in 1927 (A Monograph of the section "Oreocarya" of "Cryptantha", Ann. Mo. Bot. Gard. 14:211-358) agreed with Johnston and Payson had four sections in "Cryptantha": "Eucryptantha" (= "Cryptantha"), "Geocarya", "Krynitzkia" (inclusive of "Eremocarya", "Greeneocharis", and "Johnstonella"), and "Oreocarya".
Larry Higgins (1971), another expert on the perennial taxa, published a revised monograph of "Oreocarya", and agreed with Johnston and Payson on the
inclusion of "Oreocarya" within "Cryptantha", but also elevating the four sections of Johnston (1927) and Payson (1927) to subgenera. Although various species were sometimes still called synonyms of "Cryptantha".
In 2012, the phylogenetic relationship of members of the genus "Cryptantha" was carried out, based on dna sequencing analyses, it was then
proposed that the resurrection of the following genera "Eremocarya", "Greeneocharis", "Johnstonella", and also "Oreocarya".
Known species.
According to Kew:
References.
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