This photo shows leaves & flowers life size:
http://www.paghat.com/images/rhodywhite_mar.jpg
Here are some specifics that may help someone identify which kind of white
rhody this might be:

1) Trumpets are singles, a bit more than one-inch each, in small trusses
of two or four trumpets
2) Early flowering (late March & early April)
3) Small elongated evergreen leaves
4) Shrub has upright habit, open, semi-dwarf (it's four feet tall, but is
probably no less than 15 years old)
5) Doesn't show very well in this photo, but the very tippy-tip of each
anther is magenta-pink.
6) Fluffy buds are greenish white but open pure white & just slightly wrinkly.

All the rhodies taken from the old garden where I got this one have been
fairly common varieties, nothing obscure, so this one's probably common as
well. Any ideas which it might be?

-paghat the ratgirl

--
"Of what are you afraid, my child?" inquired the kindly teacher.
"Oh, sir! The flowers, they are wild," replied the timid creature.
-from Peter Newell's "Wild Flowers"
See the Garden of Paghat the Ratgirl: http://www.paghat.com/