Hibiscus flower is called "___ flower" by Koreans.

Which of the following plants does not have red flowers? A: Amygdalus persica B: Rosa rugosa C: Hibiscus mutabilis Linn. D: Pyrus sorotina.

Refuse frost flower" is an alias of which of the following flower viewing trees？ A: White magnolia (Magnolia denudata) B: Albizia (Albizia julibrissin) C: Wintersweet (Chimonanthus praecox) D: Cotton rose (Hibiscus mutabilis)