Dioscorea japonica var. pseudojaponica

基隆野山藥

endemic

Dioscorea japonica Thunb. var. pseudojaponica (Hayata) Yamam.

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

名彙資訊

學名發表文獻

Yamamoto, Journal of the Society of Tropical Agriculture 10: 182. 1938. (J. Soc. Trop. Agr.)

台灣首次記錄發表文獻

同發表文獻

異名

Dioscorea pseudojaponica Hayata

Hayata, Icones Plantarum Formosanarum 10: 42. fig. 21. 1921. (Icon. Pl. Formos.)
Dioscorea japonica Thunb. var. kelungensis (R. Knuth) Prain & Burkill

Prain & Burkill, Bulletin of miscellaneous information (Royal Botanic Gardens, Kew) 119. 1926. (Bull. Misc. Inform. Kew)

各語言俗名

日

きーるんやまのいも.
台

Soan iòh chû.

參考文獻

Yang, A list of plants in Taiwan . 1982. (List Pl. Taiwan)

特徵描述

生活型

twiner

形態特徵

Scandent perennials; stems ca. 2 mm thick, glabrous, with purplish spots.
Leaves opposite, chartaceous, elliptic or ovate-triangular, apex caudate-acute, base auriculate and more or less truncate, margins subentire, 6-12 cm long, 4-6 cm wide, nerves 7, glabrous; petioles sulcate above, slender, 3-5 cm long, glabrous; tubers axillary, ovoid, ca. 5 mm in diam.
Staminate spikes axillary, whorled, 3-5 cm long, glabrous; bracteoles triangular, cuspidate, 1 mm long; staminate flowers sessile, globose, 2 mm in diam.; perianth segments 6, imbricate, reddish punctate, outer 3 larger, rounded-oblong, apex obtuse, 1.5 mm long, concave, glabrous, inner 3 smaller, stamens 6, subsessile; anthers oblong, 0.7 mm long, apex emarginate; rudimentary ovary absent.
Capsules wide reniform, apex obcordate, base cordate, 1.8 cm long, 3 cm wide; seeds flat, with membranaceous wings.
This variety differs from var. <i>japonica</i> in having larger and more or less coriaceous leaves.

引證標本

TAIPEI: Yangmingshan, Simada 1282; Peitou, Hsiao 450, 453. TAOYUAN: Lalashan, Matuda 362. KAOHSIUNG: Alikang, Matuda s. n. 1917. HUALIEN: Taroko, Sasaki s. n. 1933.