Brazilian plume flower; Justicia carnea
A flowering plant native to South America, often grown as an ornamental. The name is a direct loan from English.
The Brazilian plume flowers were blooming beautifully in the greenhouse.
Katakana spelling is standard for this plant name; usually written in kana.
Kanji spelling is rare and mainly used in botanical contexts; learners will almost always encounter the katakana form.
From English 'Brazilian plume flower', adapted into Japanese as サンゴバナ. The kanji 珊瑚花 (literally 'coral flower') is a rare ateji spelling.