old-man's-beard(redirected from old man's beard)
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old-man's-beard,name for several plants, among them a clematisclematis
, any plant of the large genus Clematis (sometimes subdivided into three or four genera), widely distributed herbs or vines of the family Ranunculaceae (buttercup family), many of them native to the United States. Some have an irritating sap.
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, usually slow-growing organism of simple structure, composed of fungi (see Fungi) and photosynthetic green algae or cyanobacteria living together in a symbiotic relationship and resulting in a structure that resembles neither constituent.
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