Category Name Characteristics Kingdom Plantae Organisms that usually have rigid cell walls and usually possess chlorophyll. Subkingdom Embryophyta Plants forming embryos. Phylum Tracheophyta Vascular plants. Subphylum Pterophytina Generally large, conspicuous leaves, complex vascular system. Class Angiospermae Flowering plants, seed enclosed in ovary. Subclass Dicotyledoneae Embryo with two seed leaves. Order Sapindales Soapberry order consisting of a number of trees and shrubs. Family Aceraceae Maple family. Genus Acer Maples and box elder. Species Acer rubrum Red maple.