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
Botanical Garden named after Rostovtsev Botanical Garden named after Rostovtsev The Botanical Garden named after S. I. Rostovtsev () is a Botanical Garden in Moscow at the Timiryazev Agricultural Academy. Founded in 1895 on the initiative of botanist S. I. Rostovtsev. The garden area is about 1.2 hectares. The Botanical Garden is part of the complex reserve "Petrovsko-Razumovskoye" and has the status of a specially protected natural area of federal significance. The founder of the botanical garden S. I. Rostovtsev will divide it into 3 departments: systematic, biological and experimental. In the systematic department, students studied the systematics of plants. The biological department was designed