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北アメリカが原産です。わが国へは明治時代の中頃に渡来しました。高さは50〜100センチになります。葉は卵形から長卵形でやや薄く、毛はなく、対生します。7月から9月ごろ、黄色から橙黄色の頭花を咲かせます。舌状花は8〜15個あります。別名で「ひめひまわり(姫向日葵)」あるいは「きくいももどき(菊芋擬き)」と呼ばれます。
写真中13・下は、園芸品種の「ゾンマーゾンネ(cv. Sommersonne)」。
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キク科ヘリオプシス属の多年草で、学名は Heliopsis scabra (syn. Heliopsis helianthoides var. scabra)。英名は Rough heliopsis、Orange sunflower。
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The Rough heliopsis (Heliopsis scabra) belongs to Asteraceae (the Aster family). It is a perennial herb that is native to North America. It was introduced into Japan in the middle days of Meiji Era (1868-1912). This herb can reach 50-100 cm in height. The leaves are ovate to long-ovate, thinnish, hairless and arranged in opposite. The yellow to orange-yellow flower-heads bloom from July to September. The flower-head has 8-15 ray flowers. It is also known as "Hime-himawari" or "Kikuimo-modoki" in Japan. The 14th and bottom photos show the horticultural variety 'Sommersonne'.
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[上・中1〜3] 長野県小海町親沢にて、2005年07月11日撮影。 [中4〜中6] 東京都文京区「小石川植物園」にて、2009年08月09日撮影。 [中7・中8] 東京都小平市「都薬用植物園」にて、2009年8月09日撮影。 [中9・中10] 長野県塩尻市旧塩尻にて、2005年09月21日撮影。 [中11・中12] ポルトガル・セントロ地方・レイリア市にて、2023年09月13日撮影。(photo by Yumi Gunji) [中13・下] アメリカ・テキサス州「フォートワース植物園」にて、2007年05月13日撮影。(photo by Jon Suehiro)
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