Meaning of old man's beard

(noun) dense festoons of greenish-grey hairlike flexuous strands anchored to tree trunks and branches by sparse wiry roots; southeastern United States and West Indies to South America

vigorous deciduous climber of Europe to Afghanistan and Lebanon having panicles of fragrant green-white flowers in summer and autumn

common climber of eastern North America that sprawls over other plants and bears numerous panicles of small creamy white flowers