Botany Terms

Name Structure/ Category Description
Pistillate [Flowers] {gender} Having functional pistils, but no functional stamens, making the flower unisexual and female.
Pith The more or less soft and spongy tissue in the center of some stems and roots; sometimes degenerating to leave a hollow tube.
Placentation The arrangement of ovules within the ovary.
Plane [Leaf margins, Leaflet margins] {vertical disposition} With midrib and margin all in one plane, or nearly so; flat.
Plated [Bark of mature trunks] {surface appearance} Bark with relatively large, more or less flat plates, as in mature loblolly pine (Pinus taeda) or mature white oak (Quercus alba).
Plumose feathery, plume like. For example, wind-pollinated female flowers often have plumose stigmata so that they are more likely to receive the pollen of male flowers. Sometimes the hairs at the apex of a wind-dispersed achene (or seed) are called 'plumose' because they are branched and feathery in appearance, rather than straight and bristly
Pollen The small, often powdery, grains which contain the male reproductive cells of flowering plants and gymnosperms.
Pollen cone A male or pollen-producing cone; typically smaller and of shorter duration than seed cones.