This group includes angiosperms in which the seed bearsonly one cotyledon. The leaves are simple and exhibit parallel venation Closed type of vascular bundles because cambium is absent in it Vascular bundles are scaered inparenchyrna Flowers are usually trimerous Roots arc adventitious. It is divided into the following seven series.
- Microspermae : Ovary is inferior; seeds are minute and non-endospermic.
- Epigynae : Ovary inferior, seeds are large and endospermic.
- Coronarieae : Ovary superior, perianth petalloid.
- Calycinae : Ovary superior, perianth sepalloid.
- Nudiflorae : Perianth reduced or absent. Seeds are endospermic.
- Apocarpae : Carpels more than one, free, seeds are endospermic.
- Glumaceae : Perianth reduced or absent, scaly bracts present.
