| pter | small genus sometimes included in genus Onoclea |
|---|---|
| pter | tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes |
| pter | one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems |
| pter | a genus of ferns belonging to the family Dennstaedtiaceae |
| pter | large coarse fern often several feet high |
| pter | fern of southeastern Asia |
| pter | containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns |
| pter | plants having vascular tissue and reproducing by spores |
| pter | an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) |
| pter | used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales |
| pter | used in some classification systems: a group of extinct fossil gymnosperms coextensive with the order Cycadofilicales |
| pter | extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies |