Arisaema consanguineum Schott

Robust perennial herb up to 1 m tall with subglobose tuber. Leaf solitary, surrounded at base by about 3 oblong bracts (cataphylls); petiole sheathed for about half its length, above sheath uniform mid green, becoming striated with brown basally, sheath pink-tinged brown; blade radiatisect, leaflets 7-11, sessile narrowly-elliptic to sublinear, 24-33 cm long, 3-6.5 cm broad, acute-acuminate (filiform in some collections), cuneate basally, glossy darkish greeen aboev, paler below, subequal, margins entire. Inflorescence shorter than leaves (equal in some forms), peduncle pale green. Spathe-tube cylindric, 5 cm long, 1.4 cm in diam., pale green with slightly paler veins, white at extreme base; limb with lower part broadlyovate, 7 cm long, 4.4 cm broad, broadly auriculate with somewhat revolute margins, exterior green with purple-tinged veins, interior pale green with brown-purple margins, upper part a long, pendent, subulate to filamentous tail up to 18 cm long. Spadix female (in our plant); appendix clavate, longer than spathe tube and curved forwards at swollen, rounded apex, 6 cm long, 0.7 cm in diam. near apex, pale green, basal half erect, cylindric, bearing a few up-curved, subulate projections; female zone conic, 2.3 cm long, 1 cm in diam. Female flowers 1 mm in diam., ovary globose, style very short, apiculate, stigma capitate. (Male spadix as represented in Kew Herbarium by other collections from the Chiang Mai region of northern Thailand differs in lacking projections at the base of the spadix. Male flowers subsessile or sessile, anthers dehiscing by circular pores.)