1) Genus pickeringia 2) Rosid dicot genus 
Pickeringia is a monotypic genus of flowering plants in the legume family, Fabaceae. It was recently assigned to the unranked, monophyletic Cladrastis clade. It was named after the naturalist Charles Pickering. Its only species is Pickeringia montana, which is known by the common name chaparral pea. It is endemic to California in the United States...
[n] - 1 species: chaparral pea
genus Pickeringia noun one species: chaparral pea