Eriocaulon heleocharioides

[Surroundx]

Tanaka, Torio et al. (2014). Seed Germination Response to Storage Conditions of Eriocaulon heleocharioides (Eriocaulaceae), an Extinct Species in the Wild. Bull. Natl. Mus. Nat. Sci., Ser. B 40(2): 95-100.

[koeiyabe]

www.kahaku.go.jp/research/publication/botany/download/40_2/BNMNS_B40-2_95-100.pdf
www.botanic.jp/plants-ka/kosiga.htm

Eriocaulon heleocharioides Satake (Eriocaula- ceae) is an annual aquatic herb endemic to Japan and an extinct species in the wild (Ministry of the Environment, 2012). The species was collected for the first time in Koshigaya, a city in central Japan, in 1938 and described in the following year (Satake, 1939). Thereafter, it was never found at this or other sites, and hence, was considered extinct (Satake, 1982). However, the species was rediscovered, collected as herbarium specimens and deposited in the Ibaraki Prefectural Museum, at Sanuma Lake, Shimotsuma, Ibaraki Prefecture, central Japan in 1975. The lake is a large water storage reservoir for paddy fields. Further, in 1994,
this species also became extinct in Sanuma Lake. This species disappeared from its last habitat after a change in water management in 1994 and has been preserved only ex situ such as in botanical gardens.

This herb had grown in marshes; pools or riverbeds and can reach 10-30 cm in height. The leaves are linear and form in rosette. The many flower stalks are borne and bloom solitary clusters from July to September. This herb is succeeded in regermination in 2009.



Reference: 　J. J. B. 15: 627 (1939), in Nakai & Honda, Nova Fl. Jap. 6: 34, f. 14 & 15 (1940); Ohwi, Fl. Jap.: 264 (1953); T.Koyama in Ohwi, Fl. Jap. ed. Engl.: 267 (1965); Z.X.Zhang, Dissert. Bot. 313 [Monogr. Gatt. Eriocaul. Ostas.]: 244, t. 96 (1999). Type: Saitama, oppido Kosigaya (Y.Satake, 24 Oct. 1938, TI).

[Surroundx]

Tanaka, Norio, Ono, Hiroki and Nagata, Shoh. (2015). Floral Visitors of Eriocaulon heleocharioides (Eriocaulaceae), an Extinct Aquatic Species in the Wild. Bull. Natl. Mus. Nat. Sci., Ser. B, 41(4): 179-182.

[Surroundx]

Horiuchi, Yuju, Kamijo, Takashi and Tanaka, Norio. (2020). Biological and ecological constraints to the reintroduction of Eriocaulon heleocharioides (Eriocaulaceae): A species extinct in the wild. Journal for Nature Conservation 56: 125866. [Abstract]

[Surroundx]

Horiuchi, Yuju, Kamijo, Takashi and Tanaka, Norio. (2021). Floral and pollination characteristics of Eriocaulon heleocharioides, an extinct species in the wild, for evidence‐based conservation management. Plant Biology. doi: doi.org/10.1111/plb.13236 [Abstract]