Arum echinatum Wallich, Pl. Asiat. Rar. 2: 30. 1831.

Tuber depressed globose, 2-4 cm in diam. Cataphylls 2, green, 4-20 cm. Cataphylls, petiole, and peduncle green, unmarked. Leaf solitary; petiole ca. 30 cm, basal ca. 6 cm 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 × 2.8 cm; outer leaflets 7-8.5 × ca. 1.4 cm. Peduncle emerging from petiole sheath, much shorter than petioles, ca. 17 cm. Spathe green, not marked by spots or stripes; tube cylindric, ca. 5.5 × 1.5 cm, slightly recurved at throat; limb slightly outcurved at base, otherwise incurved, ovate, ca. 8 × 5 cm, long caudate, with filiform tail to 8 cm. Spadix unisexual; female zone conic, ca. 2.3 × 1.4 cm, flowers dense; ovary green, subglobose; stigma punctate, violet; male zone 1.5-3 cm, 3-5 mm in diam. at base; synandria lax; anthers 4, dehiscing by apical pores. Appendix green, cylindric, ca. 4 cm × 5-6 mm, base abruptly narrowed and stipitate, apex obtuse and echinate; stipe ca. 5 mm. Fl. Jun.

Himalayan plants differ from those in Gaoligong Shan in having the spathe green, white striped outside, and dark purple inside.

Forested slopes; 2600-3100 m. S and SE Xizang (Gyirong, Nyingchi, Zayü), W Yunnan (Baoshan, Gaoligong Shan, Lijiang) [Bhutan, India (Sikkim), Nepal].