S-T Samara: A dry, winged fruit containing one seed. Example: ash, elm. Scape: A leafless stalk of a flower or an inflorescence. Schizocarp: A fruit developed from two fused ovaries; the two fruit separate from one another at maturity; each fruit contains 1 seed. Sepal: the outer layer of floral parts, often (but not always) green and leaf-like in appearance. Serrate: Toothed Sessile: Having no stalk Simple: A leaf that is not divided into leaflets. Sinus: The portion of the edge of a leaf that is indented in between two lobes. Solitary: A single flower (as opposed to flowers in a cluster or inflorescence.) Spadix: An inflorescence with a single thickened axis embedded with numerous small flowers. Spathe: A large bract that subtends the spadix (the inflorescence found in the aroid family). Spike: An inflorescence with a single axis and flowers without stalks. Spur: A stem with very short internodes. Stamen: the pollen-bearing organ of a seed plant, usually consisting of an anther and a filament. Stigma: The top part of the female pistil. It receives pollen. Stigmatic slit: The opening to the pistil of the milkweeds (Asclepias species) Stipule: an appendage, often leaf-like Strobilus: Cone-shaped reproductive structure common in gymnosperms. Style: The section of the pistil located between the stigma and the ovary. Subtend: Situated below another structure. Tepal: When petals and sepals cannot be distinguished from one another, they are referred to as tepals. Trifoliate: A compound leaf with three leaflets. Triternate: A compound leaf with three leaflets, each of which is subdivided into three sections.