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herbaceous plant
herbaceous plant , plant whose stem is soft and green and shows little growth of wood. The term is used to distinguish such plants from woody plants. Herbaceous plants, or herbs, as they are commonly called, may be annual —that is, the plants die after a year's growth, and the plants are pr...
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medicinal plants
medicinal plants plants used as natural medicines. This practice has existed since prehistoric times. There are three ways in which plants have been found useful in medicine. First, they may be used directly as teas or in other extracted forms for their natural chemical constituents. Second, they m...
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Barking and Dagenham
Barking and Dagenham , outer borough (1991 pop. 139,900) of Greater London, SE England. The borough has a power plant and an automobile manufacturing plant as well as engineering, chemical, paint, wood, and other industries. The remains of a Benedictine abbey (c.670) are there.
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essential oils
essential oils volatile oils that occur in plants and in general give to the plants their characteristic odors, flavors, or other such properties. Essential oils are found in various parts of the plant body (in the seeds, flowers, bark, or leaves) and are also concentrated in certain special cell...
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budding
budding type of grafting in which a plant bud is inserted under the bark of the stock (usually not more than a year old). It is best done when the bark will peel easily and the buds are mature, as in spring, late summer, or early autumn. Budding is a standard means of propagating roses and most f...
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stem
stem supporting structure of a plant, serving also to conduct and to store food materials. The stems of herbaceous and of woody plants differ: those of herbaceous plants are usually green and pliant and are covered by a thin epidermis instead of by the bark of woody plants. There is relatively more...
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cambium
cambium , thin layer of generative tissue lying between the bark and the wood of a stem, most active in woody plants. The cambium produces new layers of phloem on the outside and of xylem ( wood ) on the inside, thus increasing the diameter of the stem . In herbaceous plants the cambium is almost i...
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rubber plant
rubber plant name for any plant that yields rubber, specifically the India-rubber tree ( Ficus elastica ), an Asian fig .
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dioecious plant
dioecious plant , plant in which the male and female reproductive structures are found in different individuals, as distinct from a monoecious plant (see hermaphrodite ), in which they are found in the same individual.
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cork
cork protective, waterproof outer covering of the stems and roots of woody plants. Cork is a specialized secondary tissue produced by the cork cambium of the plant (see meristem , bark ). The regularly arranged walls of cork cells are impregnated with a waxy material, called suberin, that is almo...
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