(First upload on October 6 2011. Last on September 14 2014) [ 日本語 | English ]

Metaplexis japonica (Thunb.) Makino

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

[Engler's syllabus (エングラー体系), APG: grouped into Apocynaceae]

Asclepiadaceae Burnett (ガガイモ), milkweed family

More than 250 genera in the world (mainly in temperate regions)
Lifeform: vines, herbs and shrubs
Six genera in Japan
Asclepias (トウワタ), American Continent
Cynanchum L. (イケマ)
Gymnema R. Br. (ホウライアオカズラ), not in Japan
Hoya R. Br. (サクララン), southern Japan
Marsdenia R. Br. (キジョラン), southwest Japan
Metaplexis R. Br. (ガガイモ), east Asia
Stephanotis Thouars (シタキソウ), southwest Japan
Tylophora R. Br. (オオカモメヅル), tropical to temperate regions
Vincetoxicum Wolf, auct. non Walter (カモメヅル), when separated from Cynanchum

Metaplexis japonica in Hokkaido

Metaplexis R. Br. (ガガイモ) in Japan
One species, Metaplexis japonica, is distributed in Japan
Gagaimo (ガガイモ, 蘿芋), rough potato
Lifeform: deciduous, perennial climber
Distribution: east Asia, including Japan
Habitat: sunny sites, such as grasslands, forest edges, and roadsides

Field training on integrated environmental research (統合環境調査法実習) (fauna and flora 種リスト)

Leaf: opposite phyllotaxis
Fruit: used for medicine (羅摩子)
Chromosome number: 2n = 22 or 24
f. albiflora Honda (シロバナガガイモ)

Welsh SL, Anderson DE. 1962. Metaplexis japonica: an oriental milkweed from an Iowa cornfield. Brittonia 14: 186-188

MetaplexisCynanchum caudatum (イケマ)
Leaf abaxial side = pale green ↔ white-green
Latex = white ↔ less

[1-4] climbing up on a fence in N27/W3, West Ward, Sapporo, on August 31 2011. [5/6] at a roadside, N23/E1, West Ward, Sapporo, on July 18 2014. Record: in the campus of Northeast Normal University in Changchun, northeastern China, on June 5 2017.