The photographs used on our home page and in the above header are used with permission from the USDA-NRCS PLANTS Database and the National Phenology Network. Please see specific credits below:
- Eastern red columbine (Aquilegia canadensis) - Jennifer Anderson @ USDA-NRCS PLANTS Database
- Aspen (Populus tremuloides) - USDA-NRCS PLANTS Database / Herman, D.E. et al. 1996. North Dakota tree handbook. USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Admin., Bismarck, ND.
- Virginia bluebells (Mertensia virginica) -Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester, PA.
- Flowering dogwood (Cornus florida) - Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester, PA.
- California poppy (Eschscholzia californica) - Mark W. Skinner @ USDA-NRCS PLANTS Database
- Lanceleaf springbeauty (Claytonia lanceolata) - Tom Barnes University of Kentucky @ USDA-NRCS PLANTS Database
- Big leaf maple (Acer macrophyllkum) - J.S. Peterson @ USDA-NRCS PLANTS Database
- Indian Pink (Spigelia marilandica) - Tom Barnes University of Kentucky @ USDA-NRCS PLANTS Database
- Trout lily (Erythronium americanum) - Tom Barnes University of Kentucky@ USDA-NRCS PLANTS Database
- Colorado blue columbine (Aquilegia caerulea) - Al Schneider @ USDA-NRCS PLANTS Database
- Lilac (Syringa chinensis) - Prof. Mark D. Schwartz, Dept. of Geography, UW-Milwaukee, Milwaukee, WI
- Jack in the pulpit (Arisaema triphyllum) - Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester, PA.