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,
Salvia divinorum plants, notably Cacahuaxochitl ("Quararibea funebris"), again suggesting that there is no consensus. "Salvia divinorum" has large green ovate (often also dentate) leaves, with a yellow undertone that reach 10 to 30 cm (4 to 12 in) long. The leaves have no hairs on either surface, and little or no petiole. The plant grows to well over in height, on hollow square stems which tend to break or trail on the ground, with the plant rooting quite readily at the nodes and internodes. The flowers, which bloom only rarely, grow in whorls on a inflorescence, with about six flowers to each