nomenclatorial act:
emend.
Page:
277
diagnosis:
Cordaitean plants with endarch maturation of the cauline xylem and compound cones borne irregularly as epicormic branches. Leaves helically arranged; primary cascular architecture sympodial, with the number of sympodia equaling the denominator of the phyllotactic fraction. Leaf traces diverge from margin of pith as one or two bundles; branching axillary, with bud or branch vascularized by two bundles that diverge from stem distal to leaf trace emission. Leaves range from needle-like to spatulate, often produced in heteroblastic series. cones, when found isolated, assignable to Cordaianthus. Pollen similar to sporae dispersae Florinites.
systematic position:
Cordaitales
typeseries:
Cordaixylon dumusum Rothwell & Warner, 1984
Classification:
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