The Harvard Herbaria has an extensive set of plant images
on-line. Gopher over to huh.harvard.edu and enjoy!
(look in the top 10 items list).
On a related note, the same gopher contains images from
the Museum of Comparative Zoology. If you need some spider
images next Halloween, they have quite a collection!
Keith Robison
Harvard University
Department of Cellular and Developmental Biology
Department of Genetics / HHMI
krobison at nucleus.harvard.edu