sentences:  "S. edentatum" was a previously overlooked species that is related to and appears similar to "S. calcaratum" and "S. ecorne".Allen Lowrie and Sherwin Carlquist described this species in 1989 and argued that if "S. ecorne" is considered distinct from "S. calcaratum", then certainly "S. edentatum" warrants placement at the species level.It differs from "S. calcaratum" and "S. ecorne" by the long petioles on its recurved leaves, and the cuneate, obtuse, and unlobed posterior corolla lobes.