Squarrose. Having spreading and projecting processes, such as the tips of involucral scales.
Squarrulose. Diminutively squarrose.
Stamen. One of the pollen-bearing or fertilizing organs of the flower.
Staminodium. A sterile stamen, or any structure without anther corresponding to a stamen.
Standard. The upper dilated petal of a papilionaceous corolla.
Stellate, Stelliform. Star-shaped.
Stem. The main ascending axis of a plant.
Sterile. Unproductive, as a flower without pistil, or stamen without an anther.
Stigma. That part of a pistil through which fertilization by the pollen is effected.
Stigmatic. Belonging to or characteristic of the stigma.