Firstly described by Standley (1927), transferred to Thismia by Jonker (1938). Accepted by Maas et al. (1986). Formally, it was thought to occur only in northern South America and Central America (Costa Rica, Panama, Ecuador), but today T. panamensis is known also from Peru and Boliva as well as the states Goiás (Guilherme et al. 2016) and Paraná of Brazil (de Souza 2021). Its flower can vary from pink to yellow, greenish and white. It is characterized by a gibbous and, therefore, zygomorphic floral tube, but having a horizontal opening with actinomorphic tepals (3 of which are filiform, 3 are ovate).
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