Kingdom Plantae Class Equisetopsida Genus †Hamatophyton | Division Pteridophyta Order †Sphenophyllales Rank Species | |
Similar Sphenophyllales, Sphenophyllum, Stigmaria, Archaeopteris, Equisetopsida | ||
Hamatophyton verticillatum is a species of the extinct Sphenophyllales horsetails.
Description
Axes of this plant are pseudomonopodial with axial trichomes or spines and nodal whorls of sterile leaves. Leaves are dimorphic and sometimes contain trichomes or spines. When mature, primary xylem is exarch and the secondary xylem lacks parenchyma.
References
Hamatophyton verticillatum Wikipedia(Text) CC BY-SA