Arisaema echinatum (Wall.) Schott

Tuber depressed globose, 2–4cm in diam. Cataphylls 2, green, 4–20cm. Cataphylls, petiole, and peduncle green, unmarked. Leaf solitary; petiole ca. 30cm, basal ca. 6cm sheathing into pseudostem; leaf blade radiate; leaflets 7–11, sessile, glaucous abaxially, green adaxially, narrowly elliptic or oblanceolate, unequal, attenuate to base, apex long acuminate, sometimes caudate with a short filiform tail; central leaflet ca. 12.5 × 2.8cm; outer leaflets 7–8.5 × ca. 1.4cm. Peduncle emerging from petiole sheath, much shorter than petioles, ca. 17cm. Spathe green, not marked by spots or stripes; tube cylindric, ca. 5.5 × 1.5cm, slightly recurved at throat; limb slightly outcurved at base, otherwise incurved, ovate, ca. 8 × 5cm, long caudate, with filiform tail to 8cm. Spadix unisexual; female zone conic, ca. 2.3 × 1.4cm, flowers dense; ovary green, subglobose; stigma punctate, violet; male zone 1.5–3 cm, 3–5mm in diam. at base; synandria lax; anthers 4, dehiscing by apical pores. Appendix green, cylindric, ca. 4 cm × 5–6mm, base abruptly narrowed and stipitate, apex obtuse and echinate; stipe ca. 5 mm.