Arisaema flavum subsp. tibeticum J.Murata

Plants monoecious and male. Tuber subglobose, 1.5–2.5cm in diam. Cataphylls 3–5, green, 8–25 cm. Leaves 1 or 2; petiole green to purplish, unmarked, 11–35cm, sheathing for ca. 4/5 length forming pseudostem; leaf blade pedate; leaflets 5–11(–15), sessile, glaucous abaxially, green adaxially, oblong-lanceolate or obovate-lanceolate, base cuneate, apex acuminate; central leaflet largest, 9–12 × 3–5 cm; outer (lateral leaflets) gradually decreasing to outermost (1.5–4 × 1–1.2cm). Peduncle emerging from pseudostem, green, 15–30cm. Spathe smallest in genus, 2.5–6 cm in total; tube yellowish green, ovoid to globose, 1–1.5 × 1–1.4 cm, constricted at dark purple throat with nectar inside; limb yellow or green, inside dark purple at least at basal part, oblong-ovate, 1.5–4.5 × 0.8–2cm, apex acuminate, slightly incurved. Spadix bisexual or male, very short, 1–2cm in total; female zone proximal, 3–7 × 5–7mm; ovaries congested, greenish, obovoid; stigma sessile; male zone distal, light yellow, cylindric, 3–7 × 2–3 mm; synandria congested, usually consisting of 2 anthers; thecae sessile, dehiscent by apical pore. Appendix yellowish or yellow green, ellipsoid, 2–5 × ca. 1.5mm, very short, rugose when dry. Mature infructescence nodding, subglobose, ca. 4cm in diam. Berries obovoid, 3–4 × 3–5mm. Seeds 3, pale yellowish, 2–2.5 mm.