This member of the Fabaceae family was given this name by Thomas Henry Kearney in 1894. It is found in Mexico and south-western U.S., growing in a well drained soil with some water and lots of sun. It starts out with a nice swollen stem, which unfortunately seems to disappear by age. On the other hand; it does get some astonishing red flowers. In rough conditions, it form a open bush, not more than one and a half meter height. Given more water, it can grow into a seven or even ten meter tree.
The genera name from Greek; eryhros; 'red' for the mostly red flowers. The species name from flabellum; 'fanned-out'.

