There are about 10 species of tall annual plants of the Asteraceae family found in Mexico and Central America. The ornamental Tithonia is one of them, the Mexican sunflower ( T. rotundifolia Blake). This wild species grows to a height of over 2m, but the cultivated species, Torch, has an upright stem and grows to a height of about 1m. It has broad ovate leaves, blooms early, and in summer, it branches roughly and produces solitary scarlet-orange sunflower-like flowers at the ends of the branches. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
メキシコから中央アメリカにかけて約10種ある丈の高いキク科の一年草。観賞用に利用されるチトニアは,それらのうちのメキシコヒマワリ(ヒロハヒマワリ)T.rotundifolia Blake(英名Mexican sunflower)である。この野生系統は高さ2mをこえるが,栽培されるのはその改良種トーチTorchで,茎は直立し,高さ1mほど。葉は広卵形,早咲きで,夏には粗く分枝して緋橙色のヒマワリに似た花を枝端に単生する。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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