Scorpioid (scorpioideus). One-sided and coiled at the top.
Segment (segmentum). A division of a deeply divided leaf, or a division of the perianth, especially when the latter is deeply divided.
Sepal (sepalum). An outer perianth-leaf, usually small, green, and of a firm texture.
Sepaloid (sepaloideus). Sepal-or calyx-like.
Septate (septatus). Chambered, i.e., divided into cells by dissepiments.
Septicidal (septicidus). Opening at the dissepiments or placentas.
Septifragal (septifragus). Opening so that the valves of the fruit break away from the dissepiments.
Serrate (serratus). Cut at the margin into sharp teeth direct towards the apex.
Sessile (sessilis). Without a stalk.
Sheath (vagina). The dilated base of certain leaves.