Williamsoniaceae

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Williamsoniaceae
Temporal range: Triassic–Cretaceous
Ptilophyllum sp.jpg
Ptilophyllum sp., a member of the Williamsoniaceae
Scientific classification
Kingdom: Plantae
Division: Spermatophyta
Class: Spermatopsida
Order: Bennettitales †
Family: Williamsoniaceae
Genera

The Williamsoniaceae are a family within the Bennettitales, an extinct group of seed plants within the Cycadophyta subdivision. Members of this family are believed to have been around two meters tall and with widely serrate leaves along a central stem. Reproductive organs of the Williamsoniaceae have varied widely in the fossil record but almost all have been found to be borne on stalks emerging from a ring of leaves.[1]

Reproduction[edit]

This family is different from Cycadeoidaceae by having the presence of cones leaving the major axis and lateral branches associated with a long peduncle covered by bracts. Some of this family reproduce by sporangia and others only produce ovule or pollen sacs.[2]

References[edit]

  1. ^ Meyen, Sergei V. (1984). "Basic Features of Gymnosperm Systematics and Phylogeny as Evidenced by the Fossil Record". Botanical Review 50 (1): 1–111. doi:10.1007/BF02874305. 
  2. ^ Paleontologia Paleovertebrados e Paleobotânica Autor : Ismar de Souza Carvalho. Editora Interciência.