Isoetes toximontana
 Isoetes toximontana is a plant species native to the Northern Cape and Western Cape regions of South Africa. It is known from only 3 sites. The type locality is on the slopes of Gifberg a mountain forming part of the eastern boundary of the Olifants River Valley. The name Gifberg means poison mountain; this is in reference to a poisonous tree called gifboom Euphorbia virosa that is endemic to the area.