Analytical Tools

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R site search (J. Baron) 
R Manuals / R packages 
R resources (Stack Overflow)
VEGAN package (J. Oksanen)
LABDSV package (D. Roberts)
SIMECOL package (T. Petzoldt) 
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Floristics 

USDA PLANTS
BONAP county-level data 
Flora of North America Online
eFloras
Atlas of the Flora of New England
New York Flora Atlas
Atlas of Florida Vascular Plants 
Angiosperm Phylogeny (P. Stevens)
Weakley's Flora of the Carolinas, VA, GA

State-level Taxon Polyclave Keys Cyperaceae Polyclave Keys (LSU) 
GRIN Taxonomy (USDA) 

Canadian Vascular Plants

Statistical Manuals

Spatial Data

Plant Trait Data

Bibliographies