Asteroxylaceae Drepanophycaceae Drepanophycales is an order of extinct lycophyte plants of Late Silurian to Late Devonian age (around 430 to 360 million years ago), found in North America, China, Russia, Europe, and Australia.

Extinct terrestrial vascular plants of the Silurian to Devonian periods.

Vascular bundle an exarch actinostele, tracheids of primitive annular or helical type (so-called G-type).

However, Kenrick and Crane (1997) in their cladistic study place Asteroxylon in the clade Drepanophycaceae.

[3] The anatomical details for the genera in the included families are tabulated by Gensel (1992) [4] A large unnamed drepanophylacean is also known from the Early Devonian Hunsrück Slate of Germany.