Attributes / relations provided by
♦ 1Robertson, C.
Flowers and insects lists of visitors of four hundred and fifty three flowers. 1929. The Science Press Printing Company Lancaster, PA.
♦ 2Schemske, D. W., M. F. Willson, M. N. Melampy, L. J. Miller, L. Verner, K. M. Schemske, and L. B. Best. 1978.
Flowering Ecology of Some Spring Woodland Herbs. Ecology 59:351-366.♦ 3Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014).
Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
♦ 4Motten, A. F. 1986.
Pollination ecology of the spring wildflower community of a temperate deciduous forest. Ecological Monographs 56:21-42.