ssp euxinum , ssp hygrophilum
Tuber vertical. Petiole of leaves 15-20 cm, often purplish. Lamina oblong-hastate, 5-11 x 2-5 cm, obtuse to acute, with very short basal lobes. Scape 18-45 cm, always longer than petioles. Spathe purplish or greenish-purple outside, darker towards base, whitish with purple border inside, often cucullate, 6.5-11 x 1.5-4 cm; tube 1.5-3 cm, dark purple inside; lamina ovate-lanceolate, acute or shortly acuminate. Spadix 4.5-7 cm, 0.55-0.9 x spathe. Female inflorescence 6-10 mm; lower sterile zone 2-3.7 mm;male zone 1.5-4 x 2-3.5 mm; upper sterile zone 3-7 mm. Sterile filaments reddish-purple or -violet, lower 2-3 mm, upper 4-5 mm. Appendix not stipitate, very slender, 2.5-4.5 cm x 1.5-2.2 mm. Fl. 4-6. Rocky places, woodland, marshy meadows, 300-1680 m.