Seed are sometimes sold commercially while still enclosed within the hard wall of the fruit, which must be split open to reach the seed. Different groups of plants have other modifications, the so-called stone fruits (such as the peach) have a hardened fruit layer (the endocarp) fused to and surrounding the actual seed. Nuts are the one-seeded, hard-shelled fruit of some plants with an indehiscent seed, such as an acorn or hazelnut. Seeds are produced in several related groups of plants, and their manner of production distinguishes the angiosperms ("enclosed seeds") from the gymnosperms ("naked seeds"). Angiosperm seeds are produced in
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