Arisaema speciosum var. speciosum

Plants dioecious. Rhizome cylindric, 4–10 × 2–4cm. Cataphylls 2 or 3, reddish brown, inner one to 15cm. Leaf solitary; petiole pale green, not spotted, 15–50cm, base forming pseudostem, 1–1.5cm in diam.; leaf blade 3-foliolate; leaflets with petiolules 1–1.5cm, pale green with narrow red margin, not spotted; central leaflet dull adaxially, ovate or oblong, 11–13 × 4–7cm, base cuneate, apex acuminate or acute; lateral leaflets obliquely oblong to lanceolate, larger than central leaflet, 13–16 × 4.5–6.5cm, base strongly oblique (one side cuneate, other deeply cordate), apex abruptly shortly acuminate. Peduncle whitish with tiny brown dots, much shorter than petioles, 2.5–10cm. Spathe dark purple, with whitish longitudinal lines; tube cylindric, 4–10 × 1–3cm, throat margins obliquely truncate, slightly outcurved; limb arching over spadix, oblonglanceolate, 8–20 × 6–8cm, margins narrowly recurved, apically gradually acuminate, drooping. Spadix unisexual; female zone subconic, ca. 1.7 × 1.2cm; ovary obovoid; stigma sessile, punctate; male zone cylindric, ca. 2.5 cm × 5mm; male flowers purple; synandria of 3–5 stamens; connected filaments distinct; thecae dehiscing by a single horseshoe-shaped slit. Appendix pink to dark purple, very narrowly conic, filiform distally, 20–80cm, base to 8 mm in diam., narrowed into a stipe ca. 1cm. Fruiting peduncle erect. Berries red, obovoid-obconic, angulate.