Virginianthus E.M.Friis, H.Eklund, K.R.Pedersen et P.R.Crane
Plant Fossil Names Registry Number: PFN002039
Act LSID: urn:lsid:plantfossilnames.org:act:2039
Reference: Friis, E. M., Eklund, H., Pedersen, K. R. & Crane, P. R. (1994): Virginianthus calycanthoides gen. et sp. nov. – A calycanthaceous flower from the Potomac Group (Early Cretaceous) of eastern North America. – International Journal of Plant Sciences 155(6): 772–785., link
Page of description: 773
Virginianthus calycanthoides E.M.Friis, H.Eklund, K.R.Pedersen et P.R.Crane
Flower small, bisexual, actinomorphic, and multipartite. Hypanthium cup-shaped. Perianth and androecium composed of numerous parts arranged in densely crowded series on the rim of the floral cup. Stamens not clearly differentiated into anther and filament. Anthers dithecate and tetrasporangiate, extrorse, dehiscing by four laterally hinged valves; pollen sacs linear and parallel; sterile tissue abundant, surrounding the sporangia apically, laterally, basally, and adaxially; inner series of androecium staminodial. Pollen monocolpate. Gynoecium composed of numerous free carpels borne on the inner surface of the hypanthium.
From the state of Virginia, where the fossil was found.