Authors who have seen the species in the East do not hesitate to say that it is subspontaneous.
Many floras of the south of Europe speak of it as a subspontaneous or naturalized species.
Usually they indicate the carob tree, as cultivated and subspontaneous, or nearly wild.
1650s, from Late Latin spontaneus "willing, of one's free will," from Latin (sua) sponte "of one's own accord, willingly;" of unknown origin. Related: Spontaneously. Earliest use is of persons and characters. Spontaneous combustion first attested 1795. Spontaneous generation (the phrase, not the event) attested from 1650s.