International Aroid Society
Aroid is the common name for members of the Araceae family of plants, sometimes known as the Philodendron or Arum family. The sometimes beautiful and sometimes bizarre combination of spathe and spadix known as the inflorescence, and sometimes referred to as a flower, is a distinguishing feature of all aroids. The mission of the International Aroid Society is to provide information, assist in the distribution of unusual species and provide fellowship to everyone with an appreciation for this wonderful plant family.
http://www.aroid.org/
BBSRC Brassica Genome Project
Science, Biology, Flora and Fauna, Plantae - BBSRC Brassica Genome Project. A project to map and work with parts of the Brassica genome.
http://brassica.bbsrc.ac.uk/
Carnivorous Plants and their habitats
Science, Biology, Flora and Fauna, Plantae - Carnivorous Plants and Their Habitats. List of the 86 species of Nepenths, with photos of many wild plants.
http://www.joachim-nerz.de/
Malvaceae Info
Science, Biology, Flora and Fauna, Plantae - Malvaceae Info. Information and images on many species of ornamental malvaceous plants, including flowers, foliage, and fruit.
http://www.malvaceae.info/
Saving the American Elm
Science, Biology, Flora and Fauna, Plantae - Saving the American Elm. Information about efforts to restore Ulmus americana to the landscape by developing and planting new disease resistant varieties.
http://www.elmpost.org/
Mammillarias.net
Science, Biology, Flora and Fauna, Plantae - Mammillarias.net. Forum, comprehensive photo gallery, and collection database.
https://www.mammillarias.net/
Echinocereus Online
Science, Biology, Flora and Fauna, Plantae - Echinocereus Online. An electronic magazine about the genus, in German and English.
https://www.echinocereus.de/
The Genus Astrophytum
Science, Biology, Flora and Fauna, Plantae - The Genus Astrophytum. Monograph of the cactus genus Astrophytum.
http://www.astrobase.de