Evolutionary history of plants seed model is shared by basically all gymnosperms (literally: "naked seeds"), most of which encase their seeds in a woody cone or fleshy aril (the yew, for example), but none of which fully enclose their seeds. The angiosperms ("vessel seeds") are the only group to fully enclose the seed, in a carpel. Fully enclosed seeds opened up a new pathway for plants to follow: that of seed dormancy. The embryo, completely isolated from the external atmosphere and hence protected from desiccation, could survive some years of drought before germinating. Gymnosperm seeds from the Late Carboniferous have been found to contain
Passum sub iugum Passum sub iugum The passum sub iugum ("pass under the yoke") was a practice in ancient Italy where defeated enemies were made to pass beneath a yoke constructed of spears either to humiliate them or to remove blood guilt. The practice of "passum sub iugum" was a ritual humiliation of enemies practiced by the people of ancient Italy. Both the Romans and the Samnites forced the captives of their defeated enemies to pass under a yoke formed from spears. The practice is said to have originated as a form of expiation. According to Livy, Horatius killed his own sister because