A seed plant or spermatophyte, also called a phanerogam or a phaenogam, is any plant that produces seeds. It is a category of embryophyte that includes most of the familiar land plants, including the

Calamopityaceae is the largest family of the division of extinct seed-bearing plants known as Pteridospermatophyta. It is the only family in the monotypic order Calamopityales. This family is characte