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(First upload on January 22 2012. Last on September 23 2016) [ 日本語 | English ]

Coix L. (ジュズダマ) C. lacryma-jobi L. (ジュズダマ, s.l.) var. lacryma-jobi (オニジュズダマ), the type, syn. var. maxima Makino var. lacryma-jobi (ジュズダマ, 数珠玉), gromwell reed or Job's tear トウムギ (唐麦) Life form: perennial grass (annaul in cold regions, including Kanto) Distribution: originally in tropical Asia imported to Japan 6000 ya in Jomon Era (縄文時代), now in south to Kanto District Habitat: wet, sunny grasslands and foothills

Chromosome number: 2n = 20 Synonyms: Coix agrestis Matsumura var. ma-yuen (Rom. Caill.) Stapf (ハトムギ), cultivated variety Synonyms: - ssp. ma-yuen (Rom. Caill.) T. Koyama - var. frumentacea Makino var. stenocarpa (Oliv.) Stapf (ナガミノジュズダマ), originally in eastern Asia, cultivated in China

Coix lacryma-jobi in Japan

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[1-3] in Jindai Botanical Gardens Aquatic Plant Garden, Chofu, central Japan, on July 30 2025.