The use of types and structural types conforms fairly closely to accepted practice. Major organs and their component parts are basic morphology. The subclassifications, as in fruit types and arrangement, have been made for greater learning effectiveness and for compliance with traditional usage. The treatment of position-arrangement, shapes, and surface have been ordered or ranked to make those classifications comparative. The ratios and fractions of the subsection on shapes, if applied, will make the relative terms or character states more consistent in application.
Structural types includes typical and specialized structures.
Section C and Section D are glossaries of terms pertinent to gymnosperms and lower vascular plants. The index includes all terms presented in the chapter. Unspecialized and specialized structures are included in the structural type classification for completeness of treatment. All terms within a subject are alphabetized except those in shape where it was deemed best to group related terms. Adjectives or noun forms, usually not both, are used throughout a classification.