Hosta tardiva subsp. tardiva

Yahara, Tetsukazu, Hirota, Shun K., Fujii, Seiko, Kokami, Yasushi, Fuse, Kengo, Sato, Hiroyuki, Tagane, Shuichiro & Suyama, Yoshihisa, 2023, Molecular phylogeny and taxonomy of Hosta (Asparagaceae) on Shikoku Island, Japan, including five new species, one new subspecies, and two new status assignments, PhytoKeys 235, pp. 137-187 : 137

1A. Hosta tardiva subsp. tardiva

Phenology.

August to September.

Distribution and habitat.

Japan (Shikoku Island). This species is widely distributed in Shikoku and typically thrives on herbaceous slopes near villages. It is cultivated in Honshu but often naturalized when it escapes cultivation.

Conservation status.

Using criterion D1 for IUCN Red List categories ( IUCN 2012, IUCN 2022), we recommend that this species be qualified as LC (Least Concern) because its population is estimated to exceed 1000.

Japanese name.

Nankai-giboshi ( Nakai 1930).

Specimens examined.

Japan. Kochi Pref.: Takaoka-gun, Kubokawa-cho , 8 Aug. 2001, Se. Fujii 8725 ( JPN10003 , FU!), ditto, 23 Aug. 2002, Se. Fujii 9271 ( JPN10002 , FU!); Cultivated at Makino Botanical Garden (32 specimens listed in the Suppl. material 1; FU!) .

Note.

In Shikoku, it usually grows near mountain villages, suggesting that its wild populations escaped from cultivation.