C:
Cereal Disease Laboratory (CDL) - The mission of the Cereal Disease Laboratory is to reduce losses in wheat, oat, and barley to major diseases including leaf rust, stem rust, and Fusarium head blight. [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Climate Change Atlas for 80 Forest Tree Species of the Eastern United States - [U.S. Department of Agriculture (USDA), Forest Service]

D:
Dendrome - A collection of forest tree genome databases and other forest genetic information resources [U.S. Department of Agriculture (USDA); U.S. National Science Foundation (NSF)]

F:
Forage Seed and Cereal Research Unit - Conducts research to enhance the sustainability of seed production systems of temperate grasses and legumes [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Forage and Range Research Laboratory (FRRL) - Research efforts are focused on broadening the genetic base of rangeland and pasture plants for upgrading lands in the western United States [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

G:
Germplasm Resources Information Network (GRIN) Taxonomy - Data providing the structure and nomenclature for the accessions of the National Plant Germplasm System [U.S. Department of Agriculture (USDA)]

GrainGenes 2.0 - A small grains and sugarcane genetic database [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

H:
Harmful Algal Blooms (HABs) - Provides information on Red Tides. [U.S. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Centers for Coastal Ocean Science]

Horticultural Crops Research Laboratory - Develops fundamental information on pathology, insect pests, physiology, genetics, and production of horticultural crops [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Horticulture and Gardening -- Science Reference Guide - Research guides on horticulture and gardening, prepared by science librarians at the Library of Congress [U.S. Library of Congress (LOC)]

I:
Integrated Taxonomic Information System (ITIS) - Offers an easily accessible database with reliable information on biological species names and their hierarchical classification. [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS), Core Science Systems (CSS)]

Invasive Plant Research Laboratory - Sustainable management strategies for control of aquatic and wetland weeds [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Invasive Weed Management Unit - Develops improved weed management systems that are efficient and environmentally safe [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

N:
National Agricultural Pest Information System (NAPIS) - Offers detailed information about various insect and plant pests [U.S. Department of Agriculture (USDA)]

National Clonal Germplasm Repository for Citrus and Dates (NCGR) - Provides the genetic diversity necessary to improve citrus, related genera, and date productivity [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

National Clonal Germplasm Repository for Fruit and Nut Crops - Collects, maintains, characterizes, documents, and distributes plant germplasm from all over the world [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

National Plant Germplasm System (NPGS) - Acquires, preserves, evaluates, documents, and distributes crop germplasm [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

National Plants Database - Search a single source of standardized information about plants [U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)]

Natural Products Utilization Research Unit (PPUR) - Research on discovering natural products for use in agricultural pest management, with emphasis on pest management agents derived from plants [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Nonindigenous Aquatic Species (NAS) - A national information resource for locating biogeographic accounts of nonindigenous aquatic species in the U.S. Provided are scientific reports, online/realtime queries, spatial data sets, regional contact lists, and general information [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS)]

P:
Photosynthesis Research Unit (PRU) - Investigates critical steps in photosynthesis as well as in-plant nutrient distribution [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Plant Gene Expression Center (PGEC) - Conducts fundamental research in plant molecular biology, in collaboration with the Universty of California, Berkeley. [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Plant Protection Research Unit (PPRU) - Develops new innovative methods to protect crops from pest damage and develops crop production system that improve crop's yield and soil productivity [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Plant Science Research Unit - Researches the processes controlling increased production, improved quality, and enhanced use of crops and to develop germplasm and crop management schemes [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Poisonous Plant Research Laboratory (PPRL) - Identifies toxic plants, determines the mechanism of toxicity, develops diagnostic and prognostic procedures, and develops management strategies, antidotes, and treatments [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

S:
Small Grains and Potato Germplasm Research Unit - Concerned with potato and small grains germplasm enhancement and cultivar development, the small grains effort focusing on barley and oats [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Soft Wheat Quality Research Unit (SWQL) - Research deals with the genetic bases for the physical and biochemical determinants of milling and end-use qualities of eastern soft winter wheat [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

Status and Trends - Inventory, distribution, abundance, productivity, health, and variable changes to our living resources. [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS)]

T:
The Nature and Science of Autumn: Science Reference Guide - A research and finding aid from the Science Reference Service at the Library of Congress [U.S. Library of Congress (LOC)]

U:
U.S. Horticultural Research Laboratory - Research on disease and pest control methods for citrus crops [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS)]

U.S. National Arboretum - Conducts wide-ranging basic and developmental research on trees, shrubs, and floral plants [U.S. Department of Agriculture (USDA), Agriculture Research Service (ARS), Beltsville Agricultural Research Center]

V:
Vegetation Characterization Program, USGS-National Park Service (NPS) - A cooperative effort to classify, describe, and map vegetation communities in over 270 U.S. national park units with links to overview, standards, products, and applications [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS), Core Science Analytics & Synthesis]

W:
WDC for Paleoclimatology - Tree-ring Data Search - Includes raw ring width or wood density measurements, and site chronologies (growth indices for a site) [U.S. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA)]