Cohongarootonia Balthazar, P.R.Crane, K.R.Pedersen et E.M.Friis

Plant Fossil Names Registry Number: PFN002009


Authors: M. von Balthazar, P. R. Crane, K. R. Pedersen & E. M. Friis

Rank: genus

Reference: von Balthazar, M., Crane, P. R., Pedersen, K. R. & Friis, E. M. (2011): New flowers of Laurales from the Early Cretaceous (Early to Middle Albian) of eastern North America. in Wanntorp, L., Ronse De Craene, L. P. (eds): Flowers on the Tree of Life. Cambridge University Press: 49–87.

Page of description: 54


Cohongarootonia hispida Balthazar, P.R.Crane, K.R.Pedersen et E.M.Friis

Original diagnosis/description

Flower small, bisexual and actinomorphic , subtended by a bract. Perianth of six free tepals arranged in two alternating trimerous whorls. Organs of the outer perianth whorl broader than those of inner whorl and enclosing all inner floral organs. Long trichomes are present on the adaxial and abaxial surfaces of all tepals and oil cells are present in all tepals. Androecium of six stamens, followed by six staminodes, arranged in four alternating trimerous whorls. Stamens with distinct filaments; anthers basifixed without distinct joint between anther and filament. Anthers apparently disporangiate, dehiscing by two apically hinged flaps. Trichomes present on filaments; oil cells are present in filaments and anthers. Staminodes with short paired lateral appendages, adnate to the base of the filaments; appendages spade-shaped. Gynoecium of one superior, unilocular carpel containing a single pendant ovule. Trichomes present on style and ovary.


From the native American Algonquian name Cohongarooton for the Potomac River, after which the Potomac Group is named.

Plant fossil remain

macro- and meso-fossils-embryophytes except wood

Names associated with genus

Cohongarootonia hispida Balthazar, P.R.Crane, K.R.Pedersen et E.M.Friis 2011


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