staurophyll (σταυρός, a pale), a leaf consisting of palisade tissue.
sterrhi´um (στερρός, barren), a moor formation; sterrhad, a moor plant.
-strote (στρώτος, strewn), combining term for means of migration.
subcopious, scattered somewhat loosely.
subgregarious, arranged in loose groups.
subquadrat, a quadrat of 1–8 decimeters.
succession, complete and continuous or repeated invasion, in consequence of which formations succeed each other.
symmetry, used of topography when it shows uniform changes; radial, a condition in which the different areas are concentric; bilateral, where the areas occur in two similar rows.
syrtidi´um (σύρτις, ιδος, sandbar), a dry sandbar formation; syrtidad, a plant of a dry sandbar.
taphri´um (τάφρος, ditch), a ditch formation; taphrad, a ditch plant.