Deheubarthia was a genus of Early Devonian land plant with branching axes. A cladogram published in 2004 by Crane et al. places Deheubarthia in the core of a paraphyletic stem group of broadly defined "zosterophylls", basal to the lycopsids (living and extinct clubmosses and relatives).
References
External links Cladogram from Crane, Herendeen & Friis 2004