from The Century Dictionary.
- noun A name given to various Californian species of humming-birds.
Sorry, no etymologies found.
My dictionary doesn't have chotarosa, but plant and animal names are notoriously difficult to find (as witness this entry); at any rate, a chuparosa is a plant, but apparently also means 'hummingbird' (see this page, for instance), so chotarosa is presumably an alternate form (different dialect?)
Species that serve to separate the Mojave from the Sonoran desert include such widespread Sonoran species as ironwood (Olneya tesota), blue Palo Verde (Cercidium florium), and chuparosa (Justica californica).
I'm a little surprised, in my ignorance, that it's chuparosa rather than chuparosas - I thought this construction usually took a plural noun e.g. sacacorchos.
Blooms of brittlebush, chuparosa, popcorn flower, sand verbena, spectacle pod, and desert lily have popped up in recent days, according to the Anza-Borrego Foundation and Institute.