Williamsoniaceae
Sign in to saveWilliamsoniaceae is a family within the Bennettitales, an extinct group of seed plants. 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. thumb|Fossils and schematic diagram of Pterophyllum (plant)|Pterophyllum bavieri from the Late Triassic ([[Rhaetian) of northern Iran, Shemshak Group, A and B: leaves attached to a branch C: complete leaf]]
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Williamsoniaceae is a family within the Bennettitales, an extinct group of seed plants. 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. thumb|Fossils and schematic diagram of Pterophyllum (plant)|Pterophyllum bavieri from the Late Triassic ([[Rhaetian) of northern Iran, Shemshak Group, A and B: leaves attached to a branch C: complete leaf]]
==Reproduction== 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.
Excerpted from Wikipedia’s “Williamsoniaceae” article, available under the CC BY-SA 4.0 licence.