Taxodium L.C.M. Rich.
Taxodium is variously treated as a monospecific genus or a small genus of at most three species. According to Watson (1993) Taxodium is best circumscribed as one polymorphic species (T. distichum) with several varieties that continuously intergrade in morphologic and phenologic characteristics. Recent DNA sequencing and terpenoids also support the recognition of Taxodium as a monotypic genus with three varieties (Adams & al. 2012). At least var. distichum and var. imbricarium (Nutt.) Croom have been claimed as cultivated in Europe (Lewis 1986a, nomenclature updated after Watson 1993).
Adams R.P., Arnold M.A., King A.R., Denny G.C. & Creech D. (2012) Taxodium (Cupressaceae): one, two or three species? Evidence from DNA sequences and terpenoids. Phytologia 94(2): 159-168. [available online at: http://www.phytologia.org/Adams%20Papers%20PDF%20Files/94%282%29159-168A...
De Koning J., Van den Broek J.W., Van de Laar H.J. & Fortgens G. (2000) Nederlandse dendrologie (13e druk). H. Veenman & zonen, Ede: 585 p.
Farjon A. (2005b) A monograph of Cupressaceae and Sciadopitys. Kew Publishing: 648 p.
Lewis J. (1986a) Taxodium. In: Walters S.M. & al. (eds.), The European Garden Flora, vol. 1. Cambridge University Press, Cambridge: 77.
Van der Schans T. (2003) Gras is om in te liggen, deel 83: Metasequioa glyptostroboides (Watercipres) en Taxodium distichum (Moerascipres). On line: http://www.xs4all.nl/~wimvdven/gras83.htm.
Watson F.D. (1985) The nomenclature of pondcypress and baldcypress. Taxon 34: 506-509.
Watson F.D. (1993) Taxodium. In: Flora of North America Editorial Committee (ed.), Flora of North America north of Mexico, vol. 2. Oxford University Press, New York-Oxford: 403-404.