sphenophyllales defined in 1951 yearsphenophyllales - sphenophyllales;
sphenophyllales - Order of extinct Pteridophyta related to Equisetales which attained its maximum development in the Carboniferous and Permian periods. Herbaceous or shrubby in habit, with grooved stem bearing whorls of leaves at nodes and terminating in a cone consisting of whorls of bracts bearing sporangiophores in their axils. Homosporous.
near sphenophyllales in Knolik
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