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Papaveraceae Juss.
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- Family of flowering plants, most of these are herbaceous plants, but the family also includes some woody shrubs and a genus of small tropical trees. The family is outstanding for its many garden ornamentals and pharmaceutically important plants. Most species are found in the Northern Hemisphere.
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Oxyria Hill
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- a genus of flowering plants in the family Polygonaceae. Species of Oxyria are perennial herbaceous plants or weakly shrubby.
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Oxford University Press
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Orobanchaceae Vent.
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- A family of flowering plants, comprising of parasitic plants. The largest family of parasitic plants, its members are found nearly worldwide and are especially common in Africa, Madagascar, and warm areas of the north temperate zone. A number are serious agricultural pests.
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Ornithology
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- a branch of zoology dealing with the study of birds.
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Orchidaceae Juss.
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- a very large family of highly specialized perennial herbaceous monocotyledonous plants. Plants are distributed throughout the world, especially in wet tropics.
- commonly known as the orchid family
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Oral History
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Omphalogramma Franch.
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- is a genus of flowering plants belonging to the family Primulaceae. Its native range is the Himalayas to Central China and Northern Myanmar.
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Oleaceae Hoffmanns. & Link
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- Oleaceae are woody plants native to forested regions. Most members are trees or shrubs, but a minority, such as most jasmines, are woody climbers. Plants of the family are distributed throughout the world, except for the Arctic; they are especially abundant in tropical and temperate Asia. The tropical and warm-temperate species are evergreen; those from the colder North Temperate Zone are deciduous.
- the olive family
- A number of plants in the family are of economic or aesthetic importance: the olive tree is the source of olives and olive oil; the ashes (genus Fraxinus) are noted for their hardwood timber; and many genera are famous for their horticultural merit—e.g., Syringa (lilacs), Jasminum (jasmines), Ligustrum (privets), Forsythia (golden bell), and Osmanthus (tea olive).
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Noccaea Moench
Use for:
Iberidella Boiss.
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- a genus of flowering plants in the family Brassicaceae, native to temperate areas of western North America, southern South America, northern Africa, Europe and Asia.
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