Not well understood group
Morphology: unknown
Anatomy
Sparganum outer cortex in stems and petioles
Leaves
T-shaped vascular bundle in petiole
The foliage might be of the Triphyllopteris type
Reproduction
Unknown
└Buteoxylonales †
Ireland
Buteoxylon † (Barnard and Long 1973)
Triradioxylon † (Barnard and Long 1973)