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Description of Orchidaceae

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Description: Habit and leaf form; Anatomy; Morphology; Physiology; Biochemistry; Geography.
Angiosperm families - Orchidaceae Juss. The families of flowering plants Herbs (of diverse forms). ‘Normal’ plants, or switch-plants, or plants of very peculiar vegetative form (some producing but a single leaf, some achlorophyllous, two species completely subterranean); sometimes with the principal photosynthesizing function transferred to stems, or ‘cactoid’; sometimes no clear distinction between stems, roots and leaves, the stem bearing photosynthetic appendages equipped with animal-trapping bladders. Leaves well developed, or much reduced, or absent (sometimes). Plants succulent (often), or non-succulent; autotrophic, or saprophytic. Perennial; with a basal aggregation of leaves, or without conspicuous aggregations of leaves; cormous, or rhizomatous, or tuberous (or ‘pseudobulbs’). Self supporting, or epiphytic (predominantly), or climbing. Helophytic, or mesophytic, or xerophytic. Leaves small to large; alternate (usually), or opposite (rarely), or whorled (rarely); spiral, or distichous; flat, or folded, or rolled, or terete; ‘herbaceous’, or leathery, or fleshy, or membranous; imbricate, or not imbricate; petiolate; sheathing.
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