Jason, I don't know of any Heliconia species whose stems branch and,
if this is the case, it's probably not a H. species. Nor would the
term "panicle" apply to the form of the inflorescence of a Heliconia;
although the zig-zagged rachis of the inflorescence of many H species
may appear (especially from a distance) to form a panicle.
Some Canna species produce inflorescences that are technically
panicles, and the leaves of some are quite reminiscent of those
of some Heliconia species. Again, hoswever, I don't think there
is a species with branching pseudostems.
It's really the branching stem that seems the problem. Could it be
that what you saw *appeared* to have branching pseudostems because
of its clumping habit?
Robert Lee Riffle, author of THE TROPICAL LOOK