Cordaixylon
morphogenus
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morphogenus
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.
Shrublike plants with stems up to ca. 5 cm and profuse adventitious rooting from nodal regions. Needle-like leaves at base of branches wiht spatulate leaves up to ca. 3 cm wide distally on some branches, needle-like leaves only on others. Phyllotaxis approaching 3/8, 5/13, and 8/21, with traces diverging from pith as single bundle in smaller stems and as double bundle in largest stems. Adventitious root traces not attached to primary xylem of stem or leaf, diverging at nodes distal to leaf trace and proximal to branche trace emission. Leaves hypostomatic with single rows of stomata.