Two fairly good sources for information on hummingbird
use of native species are:

Grant, K.A. & V. Grant. 1968. Hummingbirds and their
Flowers. Columbia University Press, NY.

and

Pojar, J. 1975. Hummingbird flowers of British Columbia.
Syesis 8:25-28.
Available at:
http://home.pacifier.com/~neawanna/humm/pojar.html

My own studies suggest that hummingbirds like _Ribes spp._
just fine, but the density of occurance is probably not
sufficient to label it as more important than any of several
other early flowering plants. In fact, Salmonberry (_Rubus
spectabilis_) and Hairy Manzanita (_Arctostaphylos
columbiana_) are more plentiful at most early migration
sites and I've seen swarms of hummingbirds in Salmonberry
and Black Twinberry (_Lonicera involucrata_), but have
never been able to find a natural stand of any species of
_Ribes_ sufficiently large enough to bring in more than
one or two birds.

--
Mike Patterson
Astoria, OR
celata at pacifier.com

Half-a-bee, philosophically must ipso-facto half not-be.
But half the bee, has got to bee Vis-a-vis its entity...
d'you see?
But can a bee be said to be or not to be an entire bee
When half the bee is not a bee due to some ancient injury?
-Monty Python

http://www.pacifier.com/~mpatters/bird/bird.html