Sessile. Without a stalk.
Shrub. A bushy, woody growth, usually branched at or near the base, less than 15 feet in height.
Simple. Of one piece; not compound.
Sinuate. Strongly wavy. Page [xiii.]
Sinuous. In form like the path of a snake.
Sinus. The cleft or space between two lobes.
Smooth. Smooth to the touch; not pubescent.
Spatulate. Wide and rounded at the apex, but gradually narrowed downward. Page [xii.]
Spike. A simple inflorescence of sessile flowers arranged on a common, elongated axis (rachis). Page [xiv.]
Spine. A sharp woody outgrowth from a stem.