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How many petals do Gentianaceae flowers usually have?
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Gentianales
Great yellow gentian (Gentiana lutea) plants in bloom.
Flowers in the Gentianaceae family typically have four or five united petals. While this range is the most common, the number of petals can vary, rarely appearing as few as three or as many as 16 in some species. These petals are joined together to form tubular corollas that may be trumpet-, funnel-, or bell-shaped.12