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Using Calamites as a generic name for all those Calamarian stems in which the ribs alternate at the nodes, we have, on Weiss's system, the following sub-genera: Stylocalamites, branches rare and irregularly arranged; Calamitina, branches in regular verticils, limited to certain nodes, which surmount specially short internodes; Eucalamites, branches present on every node.
Diagrammatic longitudinal section of the cone, showing the axis ax bearing alternate whorls of bracts br and peltate sporangiophores sp with their sporangia sm.
The upturned tips of the bracts are only shown in every alternate verticil.