woolly thistle
n 1: biennial Eurasian white hairy thistle having pale purple
flowers; naturalized in North America [syn: {cotton
thistle}, {woolly thistle}, {Scotch thistle}, {Onopordum
acanthium}, {Onopordon acanthium}]
2: thistle of western North America having white woolly leaves
[syn: {woolly thistle}, {Cirsium flodmanii}]