Attached Link: http://www.inf.tu-dresden.de/ST2/cg/downloads/publicplants/

Xfrog public plants. Lots of them are in OBJ format, beside the formats unusable in Bryce. Take care with, for instance, that Montpelier maple. It's 19 MB compressed and has something like 750 thousand polygons when imported into Bryce.

-- erlik