(First upload on March 21 2012. Last on August 31 2022) [ 日本語 | English ]

Trillium apetalon Makino

Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily

Trillium L. (エンレイソウ)
Enreisou (エンレイソウ, 延齢草), Japanese trillium
Lifeform: deciduous perennial herb
Distribution: Sakhalin - Japan - south Kuril
Habitat: floor of deciduous forest, spring ephemeral

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)
HUSTEP: Plants and Plant communities in Japan (flora list)

Chromosome number: 2n = 20

Trillium smallii auct. non Maxim.

Varieties based on the colors of ovary and fruit
var. apetalon, originally green (アオミノエンレイソウ)
var. rubrocarpum J. Samejima, nom. nud. (アカミノエンレイソウ), red
var. viridipurpureocarpum (Makino) Samejima, nom. nud. (ウスグロミノエンレイソウ)
f. album J. Samejima (トイシノエンレイソウ)
f. atropurpureocarpum Makino, nom. nud. (クロミノエンレイソウ), black
f. tripetalum J. Samejima, nom. nud. (アカバナノエンレイソウ)

Trillium apetalon in Hokkaido

[1] at Otokoyama Nature Park, Asahikawa, on May 5 2012. It was rain. [2] at the backyard of GSES, HU, on May 4 2022. [3/4] at the south slope of Mount Usu (有珠山) on May 13 2011. [5] at the foot of Mount Usu on May 13 2014. The colors of calyces are russet or green. [6] on Fukuura-jima Island in Matsushima Islands, northern Honshu, on March 21 2016 (contagious distribution). [7] near the JaLTER site in the Uryu Experimental Forest of Hokkaido University, northern Hokkaido, on May 29 2018. [8] on Mount Yosomi (四十三山) close to the entrance of Geopark trail at Usu Volcano Ovservatory of Hokkaido University on April 10 2020. [9] at Naka-Toya Camp Site faced to Toya Lake on April 10 2020. Records: in a forest (Symbiosis Forest) near Nopporo Forest Park on May 5 2020. Also, flowering recorded at the south slope of Mount Usu on April 25 2022. in a forest growing the One-thousand Branched Oak in Hamamasu on May 6 2024. Along a forest road on Mount Kuromatsunai, southwestern Hokkaido, on May 22 2024.

f. atropurpureocarpum, nom. nud.

[1] at Kyogoku Fukidashi Park on June 26 2012.