Appendix is cylindrical, conical, dark brown or blackish purple, with short stems.

[6]: 130 A 2021 phenogram placed it closest to E. spiculatum,[6]: 136  but a genetic study has yet to be undertaken (apart from its use as an outgroup).

[6]: 129 It was first described as Arum intortum in 1794 by Joseph Banks and Daniel Solander in Volume II of the 2nd edition of Alexander Russel's The Natural History of Aleppo.

[7][10] A 2023 study aimed at metabolite profiling was the first mass spectrometry of the species, and identified the extract of its flowers as a strong cholinesterase inhibitor.

[11] A case of poisoning occurred in the countryside of Edessa when a girl consumed about 50 g of the corm of the plant raw,[a] developing SOB, a swollen tongue, a burning sensation in the mouth, hypersalivation, and eventually aphthous lesions and a necrotic wound on the underside of the tongue.