Williamsoniaceae is 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]
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]
Referencesedit
^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. JSTOR 4354028. S2CID 38485693.
^ Paleontologia Paleovertebrados e Paleobotânica Autor : Ismar de Souza Carvalho. Editora Interciência. 2016-03-04 at the Wayback Machine
This article related to a Triassicplant is a stub. You can help Wikipedia by expanding it.
williamsoniaceae, family, within, bennettitales, extinct, group, seed, plants, within, cycadophyta, subdivision, members, this, family, believed, have, been, around, meters, tall, with, widely, serrate, leaves, along, central, stem, reproductive, organs, have,. Williamsoniaceae is 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 WilliamsoniaceaeTemporal range Triassic Cretaceous PreꞒ Ꞓ O S D C P T J K Pg NRestoration of WielandiellaDiagram of Weltrichia a male reproductive structureScientific classificationKingdom PlantaeClade TracheophytesClade GymnospermsOrder BennettitalesFamily Williamsoniaceae Carruthers Nathorst 1913GeneraZamites leaf in partim Anomozamites leaf Ischnophyton Kimuriella whole plant Pterophyllum leaf Otozamites leaf Wielandella whole plant Williamsonia female reproductive structure Williamsoniella bisexual reproductive structure Weltrichia male reproductive structure Bucklandia axes Bennettistemon male pollen organ Vardekloeftia female seed cone Reproduction editThis 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 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 JSTOR 4354028 S2CID 38485693 Paleontologia Paleovertebrados e Paleobotanica Autor Ismar de Souza Carvalho Editora Interciencia Archived 2016 03 04 at the Wayback Machine nbsp This article related to a Triassic plant is a stub You can help Wikipedia by expanding it vte nbsp This article related to a Jurassic plant is a stub You can help Wikipedia by expanding it vte nbsp This article related to a Cretaceous plant is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Williamsoniaceae amp oldid 1149095890, wikipedia, wiki, book, books, library,
