prickly pear: see cactus.

pear, prickly: see cactus.

pear, name for a fruit tree of the genus Pyrus of the family Rosaceae (rose family) and for its fruit, a pome. The common pear (P. communis) is one of the earliest cultivated of fruit trees, both in its native W Asia and in Europe. Most of the pear strains grown for their sweet and juicy fruit are varieties of P. communis or of its hybrids with other species of Pyrus—usually P. pyrifolia, known as the Japanese, Chinese, or sand pear and indigenous to China. The main use of the sand pear today is as a rootstock in pear orchards; the related quince is used for the same purpose. Pear strains with fruit of really good eating quality were not developed until the 18th and 19th cent. in N Europe, whence almost all the present successful varieties (e.g., the Bartlett and Seckel) grown in the United States (chiefly on the Pacific coast and in the Great Lakes area) were directly imported. European production is far greater—especially in Germany, France, and Switzerland, where much of the crop is used for making pear cider (perry). Pears are also cultivated on a large scale in Japan, Turkey, Argentina, and Australia. They are usually sold fresh or canned; some are dried. Several varieties of the common pear and of other species—e.g., the small, white-foliaged snow pear (P. nivalis)—are cultivated as ornamentals, and pear wood, hard and dense, is used to a limited extent in cabinetmaking. The pear tree and its fruit are similar to the closely related apple (considered by some botanists to be of the same genus) in characteristics and in method of cultivation, but the tree is somewhat less hardy and the fruit more perishable. Pear or fire blight is the tree's most serious disease; it is also attacked by several insect pests. Pears are classified in the division Magnoliophyta, class Magnoliopsida, order Rosales, family Rosaceae.

anchovy pear: see Brazil nut.

alligator pear: see avocado.

Any of a group of flat-stemmed, spiny opuntia cacti (see cactus), native to the Western Hemisphere, or the edible fruit of certain species. Engelmann prickly pear (Opuntia engelmannii) and beaver tail cactus (O. basilaris) commonly occur in the southwestern U.S. The Indian fig (O. ficus-indica) is an important food in tropical and subtropical countries. Because their stems have a high water content, prickly pears can be used as forage crops and emergency stock feed during drought. Some species are cultivated as ornamentals and valued for their large flowers.

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Any of several species of trees of the genus Pyrus, especially P. communis, of the rose family, which is one of the most important fruit trees in the world and is cultivated in all temperate-zone countries of both hemispheres. The thousands of varieties include Bartlett (by far the most widely grown), Beurre Bosc, and Beurre d'Anjou. In the U.S., much of the crop is canned; in Europe, pears are more commonly eaten fresh or used for perry (fermented pear juice). The tree is taller and more upright than the apple tree; pear fruits are sweeter and softer than apples. Hard cells (grit, or stone cells) dot the flesh.

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Fruit of Persea americana, of the laurel family, a tree native to the Western Hemisphere from Mexico south to the Andean regions. Avocados are extremely variable in shape, size, and colour (green to dark purple). The outer skin may be thin, or coarse and woody. The greenish or yellowish flesh has a buttery consistency and a rich, nutty flavour. In some varieties the flesh contains as much as 25percnt unsaturated oil. Avocados are the principal ingredient of the Mexican sauce guacamole. They provide thiamine, riboflavin, and vitamin A.

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