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(First upload on October 10 2009. Last on September 20 2021) [ 日本語 | English ]

Hypericum L. (オトギリソウ) Otogirisou (オトギリソウ, 弟切草), upright St. John's wort Lifeform: deciduous perennial forb < 60 cm high Distribution: China - Korea - Japan flora on: Mounts Koma and Usu Habitat: grasslands and sparse forests Chromosome number: 2n = 16 var. erectum f. erectum (オトギリソウ, s.s.) Leaf: pale glands and many black glands var. caespitosum Makino (フジオトギリ), on Mount Fuji (local)

var. longistylum (Y. Kimura) Y. Kimura (オクヤマオトギリ/ニッコウヤマオトギリ), local (syn. H. gracillimum Koidz.) var. subalpinum (Y. Kimura) Y. Kimura (シナノヤマオトギリ), in north to central Honshu (local) var. parviflorum (Y. Kimura) Y. Kimura (エゾヤマオトギリ), on Mts. Daisetsu (local) var. deviatum Y. Kimura (ニセオトギリ), in Honshu (putative hybrid, local) f. perforatum Y. Kimura (メイテンオトギリ), black galnds → pale glands

Hypericum erectum in Japan

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4 5
[1/2] on a trail to go Mount Tomamu (1,239 m elevation) on July 20 2012. [3] along a stream in the Tomakomai Experimental Forest of Hokkaido University on September 12 2019. [4/5] along O-sawa Course in Nopporo Forest Park on July 17 2021. Records: along Hirai River downsteam from the office building of Wakayama Experimental Forest of Hokkaido University, western Japan, on June 27 2024.

On volcanoes in Hokkaido

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[1/2] seedlings emerged from seeds in the former topsoil on Mount Usu. The topsoil was collected in September 2008. Plants grew on July 14 2009 in the greenhouse of Center of Advanced Science and Technology (CAST), HU. [3-6] on the summit area of Mount Koma on July 21 2011. Note: One species, H. erectum is reported in Flora of Mount Usu (Hara 1978). Lab-experiment on seedbank (埋土種子) in the former topsoil of Mount Usu: Seedling emergence began one week after seed-sowing, and ceased about 20 days later (Tsuyuzaki & Goto 2001). Of the native species, this species has only black gland.