Coral Fountain, or Firecracker Bush, Russelia equisetiformis, as it is also called, is a native to Mexico and has naturalized in Florida. While you wouldn’t think a plant native to Florida would appreciate the desert southwest, this plant does seem to take our heat well and is hardy down to 15 degrees, making it suitable for both Tucson and Green Valley.
The weeping form of the Coral Fountain does indeed appear like a fountain, and the nearly leaf free branches form a dense mound about 3 feet tall and 4 feet wide.
The Coral Fountain accepts high water, but will tolerant low water applications. The coral colored flowers appear in the spring and summer, and attract hummers. This plant can tolerant full sun, but part shade also works well, and would make sense in hotter parts of the desert.
Other hummingbird plants to choose from include Mexican Oregano, Red Salvia and all of the Penstemon species.
Reference: Mountain States Wholesale Nursery and Gregg Starr Nursery Plant Info Sheet, 1999.