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
Native Seeds/SEARCH grant to pursue his studies of the agronomic characteristics and health value of desert food plants, including in relation to controlling diabetes among Indians and Hispanic Americans. As of 2016, the Native Seeds/SEARCH seed bank contained seeds from over 1800 plant varieties. In addition to a seed bank, Native Seeds/SEARCH opened a conservation farm in 1997. Seeds are distributed by mail order and a retail store in Tucson. Since 2001, Native Seeds/SEARCH has operated Southwest Regis-Tree to conserve Native Southwestern perennial species. Native Seeds/SEARCH Native Seeds/SEARCH, founded in 1983, is a nonprofit conservation organization located in Tucson, Arizona in the