It is posslble to tell the approximate time of day from the opening and closing of flowers
Dog-rose
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opens between 4 and 5 AM
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Black nightshade
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opens between 5 and 6 AM
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Cyclamen and chicory
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open between 6 and 7 AM
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Meadow buttercup, dandelion, prickly lettuce,
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and common carline-thistle
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open between 7 and 8 AM
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Anemone, Hepatica, Calendula and speedwell
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open between 8 and 9 AM
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Colchicum, yellow Adonis, pasque-flower, water lily, and wood-sorrel
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open between 10 and 11 AM
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Bladder campion
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opens at 12 noon
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Sow-thistle
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closes between 1 and 1:30 PM
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Prickly lettuce
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closes between 1 and 2 PM
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Chicory and dandelion
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closes between 2 and 3 PM
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Rootless duckweed
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closes between 3 and 4 PM
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Calendula
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closes between 4 and 5 PM
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Yellow Adonis, anemone, Hepatica, and Colchicum
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close between 5 and 6 PM
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Pasque-flower, wood-sorrel,
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and common carline-thistle
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close between 6 and 7 PM
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Water lily and meadow buttercup
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close between 7 and 8 PM
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Dog-rose
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closes between 8 and 9 PM
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