千日紅(センニチコウ) bachelor's button

　センニチコウ(千日紅)は、千日もの間紅色があせないという意味と思いますが、白やピンクなどもあるのに、なぜ紅なのでしょう。そういえば、百日紅(サルスベリ)も、白やピンク色などの花が咲きますね。

　The Japanese name of bachelor's button means that the red color does not fade for a thousand days. However, beside red color, there are also white, pink and etc., so why is it red?  Come to think of it, the Japanese name of crape myrtle means that red color does not fade for a hundred days. But there are also white, pink and etc.