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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 Leaf: sparse black spots Chromosome number: 2n = 16

var. erectum f. erectum (オトギリソウ, s.s.) var. caespitosum Makino (フジオトギリ), 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. parviflorum (Y. Kimura) Y. Kimura (エゾヤマオトギリ), local var. subalpinum (Y. Kimura) Y. Kimura (シナノヤマオトギリ), local var. deviatum Y. Kimura (ニセオトギリ) f. perforatum Y. Kimura (メイテンオトギリ)

Hypericum erectum in Hokkaido

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[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.

Hypericum erectum 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 greenhosue 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.