The continuation of the petiole of a pinnately compound leaf around which the leaflets attach.
The strengthened vein down the middle of a flower petal or simple leaf or leaflet.
the vertical layering of vegetation in a forest
society's categorization of people into socioeconomic strata
process of treating seeds to simulate natural conditions that the seeds must experience before germination can occur; most often the process involves exposure to cold in which case it may also be called cold treatment
the process leading to the formation or deposition of layers, especially of sedimentary rocks
a layering of musical texture