Almaden
Wildflowers
See a sampling of the wildflowers that can be seen at the Almaden Research Center in San Jose, CA
(owned by IBM). The pictures are arranged by color and a complete index by
common name is also available.
BGSU
Algal Image Archive
A large collection of diatom images from the Department of Biology at Bowling Green State
University, Ohio. Some in color, others in black and white. Most photos taken with a
compound microscope, some with an electron microscope.
Botanical Society of America
Online Image Collection
A new resource with images of everything from pollen to plant anatomy.
Brousseau Collection of
California Wildflowers
A collection of approximately 11,000 images of California wildflowers. Is eventually
supposed to contain 20,000 images. Both browsing and searching are supported by common and
Latin names. Searches can even be done by flower color.
Chez Marco's
Plant Pictures
An excellent collection of plant images covering everything from flowering plants to even
fungi. Plants are classified by family. This is one of the larger plant image
collections on the Internet.
Electron Micrographs
of Plant Viruses
After one look at a few of these monsters you'll be glad you aren't a
plant. Lots of high resolution B&W images here, including the famous Tobacco Mosaic Virus (TMV).
You need a fast connection to access this site, unless you want to wait a long
time. The thumbnails alone take a long time to download.
Flora of China
Picture Gallery
A large collection of pictures along with links to pictures at other sites.
Flora of Europe Photo-herbarium
A moderately extensive collection of European flower images arranged by family and genus.
Visitors are encouraged to send some of their own images for inclusion. No search
capabilities, but nice pictures.
Galleria
Carnivora
Take a walk through a virtual gallery full of carnivorous plant images. Interesting
layout. Photos are arranged into various groups and navigation is done by clicking
on rooms in a floor plan of the "museum."
Hawaiian Native
Plants
A large collection of images listed alphabetically by Latin name. Common names are also
given along with the general distribution of each species. Clicking on a name brings up a
selection of thumbnails to choose from. Most species are represented by more than one
image.
The Orchid Photo
Page
If you love beautiful pictures of stunning orchids this is the place to go. Over 100
images of various orchid species and hybrids. Go the the main page if you prefer using
thumbnails instead of just a species list.
The
Pears of New York
Scanned images from The Pears of New York was written by U. P. Hedrick and published by
the New York Agricultural Experiment Station in 1921. Reproduction of photos is good and
over 75 varieties are included!
PLANTS Photo Gallery
Photos of Northa American plants found in the PLANTS database maintained by USDA.
Vascular Plant Image
Gallery
A very complete picture gallery of plants from all over the world and the pictures are of
high quality. To find an image of a particular species you need to know its scientific
name and family. The one drawback is that there are no search capabilities, but just
browsing is rewarding.
Vascular Plants of Madagascar
Images that are part of an international effort to increase awareness of
the plants of Madagascar.
The Virtual Foliage Home Page
A very extensive collection of teaching images including topics from general
botany and plant systematics to dendrology. Hosted by the Botany Department at the
University of Wisconsin-Madison.
Wildflowers of the
Canadian Rocky Mountains
A nice collection of wildflower images which can be viewed as a slide show or by browsing
a list of common names. Not a very large collection, but the pictures are nice.
Elsewhere on About.com 
