staminate. Said of a flower that has stamens and no pistils.
stigma. The part of the pistil (usually on a stalk or style) on which the pollen germinates; it is sticky, rough, or hairy at maturity.
stipel. A stipule of a leaflet.
stipule. A leafy or scale-like appendage at the base of a petiole. Stipules are usually two in each case.
stomate, stoma (plural stomates or stomata). The openings on leaves and green parts through which gases pass; diffusion-pores or “breathing-pores.”
stone-fruit. A drupe.
strict. Said of a stem that grows straight up, without breaking into branches.
style. The stalk between the ovary and the stigma; sometimes not present.
syngenesious. Said of anthers when they cohere in a ring, as in the Compositæ, the style usually being inclosed.
tap-root. A single or leading strong root that runs straight down into the earth.