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Hibiscus mutabilis

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Hibiscus mutabilis, also known as the Confederate rose, Dixie rosemallow, or the cotton rosemallow, is a plant noted for its showy flowers.

Confederate roses tend to be shrubby or treelike in zones 9 and 10, though it behaves more like a perennial further north. Flowers can be double or single and are Template:Convert in diameter; they open white or pink, and change to deep red by evening. The 'Rubra' variety has red flowers. Single blooming flowers are generally cup-shaped. Bloom season usually lasts from summer through fall. Propagation by cuttings root easiest in early spring, but cuttings can be taken at almost any time. When it does not freeze, the Confederate rose can reach heights of Template:Convert with a woody trunk; however, a much bushier plant Template:Convert high is more typical and provides more flowering. These plants have a very fast growth rate. The Confederate rose was at one time very common in the area of the Confederate States of America, which is how its common name was derived. It grows well in full sun or partial shade, and prefers rich, well-drained soil.<ref>William C. Welch: "Hardy Hibiscus", Texas A&M University</ref>

Changing colors of the flower during a day

Floral color change

Flowers are white in the morning, turning pink during noon and red in the evening of the same day. Under laboratory conditions, the color change of the petals was slower than that of flowers under outdoor conditions.<ref name=Wong>Template:Cite journal</ref> Temperature may be an important factor affecting the rate of colour change as white flowers kept in the refrigerator remain white until they are taken out to warm, whereupon they slowly turn pink.<ref>Template:Cite book</ref>

The red flowers remain on plants for several days before they abort.<ref name=Wong/> Weight of a single detached flower was Template:Convert when white, Template:Convert when pink and Template:Convert when red. Anthocyanin content of red flowers was three times that of pink flowers and eight times that of white flowers. There was a significant increase in phenolic content with color change. Overall ranking of antioxidant properties of H. mutabilis flowers was red > pink > white.

Subramanian and Nair postulated that anthocyanins in pink and red flowers of H. mutabilis are synthesized independently since there is no reduction in phenolic content.<ref>Template:Cite journal</ref> However, Lowry suggested that anthocyanins are formed through direct conversion from flavonols as they have structural similarities.<ref>Template:Cite journal</ref>

References

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