(of a flower) intermediate between single and double in having only the outer stamens converted to petals.
（花）半重瓣的
the trees burst into sumptuous semi-double flowers of pure icing-sugar pink
Example sentencesExamples
The huge showy double and semi-double flowers are real eye-catchers - many of them grow to more than three inches across.
The Hawaiian hybrid forms of Hibiscus rosa-sinensis have been bred to include a wonderful range of pinks with single, semi-double and fully double flowers, sometimes with two or three shades in each flower.
Plants tend to be hardy, low growing and produce single or semi-double flowers.
The balloon-like buds may open into semi-double flowers having ten petals instead of the regulation five which are indeed lovely.
Depending on their variety, they can have double or semi-double blossoms, with petals of darker shades at their edges.