Arisaema dahaiense H.Li

Plants dioecious. Rhizome horizontal, outside pale brown, inside yellowish, cylindric, 7–8 × 5.5–8cm, bearing some offsets around. Cataphylls 2 or 3, deciduous, transparent, pink, 30–60 cm, membranous. Leaf 1; petiole violet, greenish distally, smooth and not spotted, ca. 80cm, ca. 3cm in diam. in proximal pseudostem part; leaf blade 3-foliolate; leaflets with petiolules 2–3.5cm, blade greenish abaxially, green adaxially, papery, usually covered with hairs; central leaflet narrowly ovate, to 25 × 18cm, base rounded, apex acuminate with a long tail; lateral leaflets obliquely ovate, to 18 × 17cm in outline, base outside ca. 2 × as wide as inside, auriculate. Peduncle erect, pinkish green, not spotted, to 25cm. Spathe dark purple with whitish longitudinal lines; tube cylindric, 8–9 × 2–3cm, throat margins slightly recurved, smooth on both sides; limb galeate, oblong, 8–10cm, apex acuminate, tip with an acumen 2.5–5cm; lateral sides widened, membranous, as wings, with whitish reticulate networks, whitish longitudinal lines from tube connected at middle of limb. Spadix unisexual; female zone sub-conic, ca. 2.2 × 1.3cm; ovary pale green, cylindric; stigma sessile; appendix violet, base truncate with a stipe ca. 8mm, proximally narrowly pyramidal, distally pendulous, filiform, to 50cm or more in total, somewhat longer in female spadix, smooth; male zone cylindric, ca. 4cm × 3–8mm (ca. 8mm in diam. at base), dark violet; synandria violet consisting of 3 or 4 stamens; connected filaments violet, ca. 1.5mm; thecae fused, violet, dehiscing by horseshoe-shaped slit. 2n = 26.