形態特徵

• A vine, the branchlets slender, glabrous.
• Leaves petiolate, 3-foliolate; leaflets membranaceous, petiolulate, unequal, ovate to oblong, 7.5–10.5 cm long, 3.5–5.5 cm broad, the lateral ones 6.5–8.5 cm long, 3.5–4.5 cm broad, apex acuminate, base very obliquely truncate, coarsely and irregularly serrate, glabrous on both surfaces, lateral veins slender, about 6–8 on each side of the midrib, subconspicuous on both surfaces; petiolules 4–12 mm long, sometimes winged; petioles 2.5–4.5 cm long, glabrous, sometimes mem¬branaceous-winged; stipules broad, persistent; tendrils leaf-opposed, umbellately 5–6-branched at tip.
• Flowers unisexual, double or triple umbellate; primary peduncles 3–7 mm long, dark puberulous, slender; calyx obscurely lobed; petals ovate to oblong, about 1.5 mm long, persistent, at length reflexed; disc fleshy; ovary 2-celled, style short; male flowers and fruits unknown.
• A distinct species with membranaceous deeply serrate leaflets and often winged petioles, petiolules and peduncles. The flowers are in compound umbels.

分布

• 台灣 : Endemic, known only from the northern part of Taiwan.

引證標本

TAIPEI: Tanaka & Simada 13569. HSINCHU: Simada 351.

參考文獻

• LU, FU- YUAN, Flora of Taiwan, second edition 3: 705. 1993.  (Fl. Taiwan 2nd edit.)