Plural of heliotrope; ornamental flowering plants known for their fragrant purple or white clustered flowers that track the sun throughout the day.
From Greek 'helios' (sun) and 'tropos' (turning, direction). The plant genus name reflects its characteristic sun-tracking behavior observed by ancient botanists.
Heliotrope flowers are basically little solar panels—they literally follow the sun from east to west and back at night, and they're one of the few flowers that smell as good as they look.
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