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.

參考文獻

• HUANG, Tseng-Chieng and HSIAO, Jin-Long, Flora of Taiwan, second edition 5: 94. 2000.  (Fl. Taiwan 2nd edit.)