Thistles (Carlina acaulis)

Thistles (Carlina acaulis)

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Credit: BRUNO PETRIGLIA/SCIENCE PHOTO LIBRARY

Caption: Stemless carline thistles (Carlina acaulis). This plant can be used to help forecast the weather. The dried flowers respond to the amount of humidity in the air and can be used as hygrometers. The flower closes at the approach of rain.

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Keywords: angiosperm, angiosperms, asteraceae, biological, biology, botanical, botany, carlina acaulis, compositae, countryside, duo, dwarf carline thistle, flower, foliage, humidity, moisture, nature, pair, plant, sensitive, silver thistle, spike, spikes, spiky, spindle, spindles spindly, stemless carline thistle, thistles, thorn, thorns, thorny, traditional, two, weather forecasting, white, wildflower, wildflowers

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