Hosta shikokiana N. Fujita, Acta Phytotax. Geobot. 27: 93. 1976. Plants on Mt. Higashi-akaishi, Mt. Akaishi, Mt. Nishi-akaishi, and Mt. Shiragayama only.

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

4. Hosta shikokiana N. Fujita, Acta Phytotax. Geobot. 27: 93. 1976. Plants on Mt. Higashi-akaishi, Mt. Akaishi, Mt. Nishi-akaishi, and Mt. Shiragayama only.

Fig. 11

Type.

Japan. Ehime Pref., Mt. Higashi-akaishi , 7 Aug. 1957, T. Yamanaka 22475 (holotype KYO!) .

Phenology.

Flowering in July and fruiting in August.

Distribution and habitat.

Japan (Ehime and Kochi Prefectures) (endemic). This species grows in open habitats on the rocky ridgeline of Mt. Higashi-akaishi and its surrounding areas on Shikoku Island.

Conservation status.

Using criterion D1 for IUCN Red List categories ( IUCN 2012, IUCN 2022), we recommend that this species be classified as VU (Vulnerable) because its population is estimated to be between 250 and 1000.

Japanese name.

Shikoku-giboshi ( Fujita 1976).

Additional specimens examined.

Japan. Ehime Pref.: Mt. Higashi-akaishi , 15 Jul. 1952, T. Yamanaka 8901 with flowers (KYO!) ; ditto (as Mt. Akaishi ), 9 Jul. 1928, G. Koidzumi s.n. with flower buds (KYO!) ; ditto, 1650 m elev., 21 Jun. 2021, T. Yahara et al. JPN6197, 6228, 6239, 6249, and 6252 with flower buds (FU!) ; ditto, 1640 m elev., 14 Jul. 1960, K. Tsuchiya 500 with flowers (KYO!) ; ditto, Mt. Hachimaki (a peak of Mts. Higashi-akaishi), 22 Jul. 2022, Se. Fujii JPN9953, 31 Jul. 2022, Se. Fujii JPN9954 with flowers (FU!); derived from Mt. Higashi-akaishi , cultivated in Makino Botanical Garden , 8 Apr. 2021, T. Yahara & Se. Fujii JPN3939-3942 sterile (FU!); between Mt. Higashiakaishi and Mt. Hutatsudake, 1600 m elev., 8 Sep. 1961, G. Murata 14981 with fruit (KYO!) ; ditto, cultivated stock of G. Murata 14981, G. Murata s.n. with flowers (KYO!). Kochi Pref.: Mt. Shiraga (cultivated stock), T. Yahara & Se. Fujii JPN3937, 8 Apr. 2021, sterile (FU!) ; ditto, Se. Fujii JPN9955, 23 Jul. 2021 with flowers (FU!) .

Note.

The following specimens cited by Fujita (1976) are not this species; the specimen from Mt. Kanpu (Yamawaki s.n., TI) is H. samukazemontana , and the specimens from Mt. Ishizuchi (Takahashi & Fujita 226, KYO; Takafuji s.n., KYO) are H. polyneuronoides .

Figures

Figure 11. Plants of H. shikokiana A JPN 5249 B a flowering plant (photo taken on 12 Jul. 2018 by Se. Fujii; not collected). Scale bars: 10 cm (A); 5 cm (B).