Arisaema candidissimum W.W.Sm.

Plants dioecious. Tuber depressed globose, 3–5cm in diam. Cataphylls 3 or 4, pinkish brown, sparsely spotted with whitish dots, 5–24 × 4–5cm, membranous, apex obtuse, convolute, encircling pseudostem. Leaf solitary; petiole entirely green, 15–35cm, base forming pseudostem, ca. 1.2cm in diam., smooth; leaf blade 3-foliolate, papery; leaflets sessile, ovate or nearly orbicular, apex rounded or acute; central leaflet 6–8 × 7–9cm (at anthesis and much expanded later), base shortly cuneate; lateral leaflets slightly oblique, 5–6 × 4–8cm. Inflorescence arising before leaves. Spathe pale green or white with green or purple longitudinal lines; tube cylindric, 3–4 × ca. 2cm, throat margins recurved; limb ovate to ovate-lanceolate, 5–6 × 3–4cm, apex with a tail 2–3cm. Spadix unisexual; female zone oblong, ca. 2 × 1cm; ovary green, obovoid; stigma subsessile, rounded; male zone cylindric, 1.6–2cm × 3–4mm; synandria consisting of 2 or 3 anthers; thecae yellow, sub-globose, opening by apical pores. Appendix suberect or erect, white or pale green, funnel-shaped, subcylindric, 3–4.5cm × 2–5 mm, naked, base attenuate, subsessile to stipitate, apex acute or obtuse.