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
Seeds of Diversity and daughter of W. Garfield Weston, launched through the W. Garfield Weston Foundation, a program to be administered by USC Canada and Seeds of Diversity. The aim of the program is to work with regional partners to "build a more secure and diverse ‘made-in-Canada’ seed supply" by promoting the production and use of locally adapted and diverse seed for crop plants. Seeds of Diversity Seed of Diversity, Semences du patrimoine, is a Canadian charitable organization that aims to "search out, preserve, perpetuate, study, and encourage the cultivation of heirloom and endangered varieties of food crops", particularly Canadian plants, and to