Plant morphology share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well. This aspect of plant morphology overlaps with the study of plant evolution and paleobotany. Secondly, plant morphology observes both the vegetative (somatic) structures of plants, as well as the reproductive structures. The vegetative structures of vascular plants includes the study of the shoot system, composed of stems and leaves, as well as the root system. The reproductive structures are more varied, and are usually specific to a particular group of plants, such as flowers and seeds, fern sori,
Gynura aurantiaca . Leaves, stems, and bracts are dark green, covered with soft purple hairs that impart a velvety feeling to the plant. One plant can produce 1-5 flower heads, each on its own flower stalk. The flowers have a rather strong odour. Each head contains several yellow, orange, or red disc flowers but no ray flowers. The Latin specific epithet "aurantiaca" means ”orange”, referring to the usual colour of the blooms. In cultivation in the UK this plant has gained the Royal Horticultural Society’s Award of Garden Merit. Gynura aurantiaca Gynura aurantiaca, called purple passion or velvet plant, is a species