Ohwi 1985 Flora of Japan

Bulbs 2.5-3 cm. in diameter, ovoid-globose; stems 30-80 cm. long, smooth, naked below; leaves broadly lanceolate to narrowly oblong, 5-10 cm.
long, 3-3.5 cm. wide, abruptly narrowed at both ends, short-petioled, smoodi; flowers 1-3 (-6), fragrant, rose-colored, infundibuliform, the tepals oblanceolate, 5-7 cm. long, unspotted, with glabrous nectary glands, recurved slightly near the summit; style elongate, curved slightly upward at tip.

June-Aug.

Low mountains, sometimes also on alpine slopes;

Honshu (Japan Sea side of centr. and n. distr.)

 

Japan Red List (2000)

It is a perennial herb that grows in mountainous and deep mountain grasslands. The stem grows to a height of 30-80 cm. The leaves are broadly lance-shaped and are 5-10 cm long. The flowers bloom from June to August and are found in small clusters at the top of the stem. They open horizontally and have pale pink petals that emit a fragrant scent. The petals are oblong and measure 5-7 cm in length, forming a funnel-shaped structure with slightly curled tips. The pollen is yellow. This plant is a native species.

Among the 35 meshes, two already become extinct, and the current status of two meshes is unknown. Only a few individuals survive in 7 mesheds, tens of individuals survive in 20 meshes, and hundreds of individuals survive in 4 meshes, estimated to be a total of about 2000 individuals. The average rate of decline is approximately 60%, and if this rate continues, this species will become extinct in about 80 years. The probability of extinction in 100 years is 100%. Deforestation, changes in vegetation, and dam construction are the main causes of this decline [VU].