Help me compile a list of useful botany links!

I'm TAing a botany course this semester and thought I would help the students out by providing them a list of useful links. If you wouldn't mind posting your favorites I will add them to the list here. This is what I have to start.

• International plant names index

• International Code of Botanical Nomenclature

• Annals of Botany Blog

• Index of Plant Chromosome numbers

• Southwest environmental Information Network

Submitted by StayAtHomeSci

• Integrated Taxonomic information System

• USDA

• Efloras

• Plant Systematics.org

• Virtual Herbaria

• Palynological Database Cool!

Lectures

• The Plant Cell: Evolutionary and Developmental Origins of Leaves

• The Plant Cell:Genetic Control of Leaf Development

• The Roalson Lab: BIOL 332, Systematic Botany

Submitted by Slicksalamander

• Taxonomic Name Resolution Service

• Biota of North America Program

• Index Herbariorum

• Tropicos

• Jepsen eFlora (California)

• Consortium of California Herbaria

• UVU Digital Herbarium

Submitted by vtslim

• Ferns of the World

Submitted by shane141

• California Flora