During the Late Devonian the oldest known seed-bearing plants grew in Pennsylvania.
Seedlings are usually seen on disturbed area where seed-bearing plants exist.
Reproduction can be enhanced by disturbing the soil close to seed-bearing plants before the seasonal rain begins.
The plants are part of the group called seed ferns because they are seed-bearing plants with fern-like leaves.
The term Pteridospermatophyta (or "seed ferns") refers to several distinct groups of extinct seed-bearing plants (spermatophytes).
Class Spermatopsida (or sometimes as several different classes of seed-bearing plants)
Division Spermatophyta (or as several different divisions of seed-bearing plants)
Early seed-bearing plants include the ginkgo and conifers.
His main research interest was in the origin and evolution of gymnosperms, non-flowering seed-bearing plants such as conifers and cycads.
The first seed-bearing plants spread across dry land, forming huge forests.
