The genus Arachnis, abbreviated as Arach in horticultural trade, (common name scorpion orchid,[2][3]) is a member of the orchid family (Orchidaceae), consisting of more than 20 species native to China, India, Southeast Asia, Indonesia, the Philippines, New Guinea, and the Solomon Islands.

[4][5] The appearance of the monopodial, epiphytic herbs of the genus Arachnis is characterized by distichously arranged, linear leaves.

[9] Arachnis senapatiana has been found growing in subtropical broad-leaved forests at elevations of 1747 m above sea level.

[6] There are currently 16 accepted species, including one natural hybrid:[1] Arachnis has become extinct in Nansei-shoto.

[1] It can be cultivated under warm and moist conditions growing in pots, baskets, or mounted on slabs.