Isoetes toximontana
| Gifberg Quillwort | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Lycopodiophyta |
| Class: | Isoetopsida |
| Order: | Isoetales |
| Family: | Isoetaceae |
| Genus: | Isoetes |
| Species: | I. toximontana |
| Binomial name | |
| Isoetes toximontana Musselman & J.P. Roux | |
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.[1] 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. The specific epithet "toximontana" is a Latin translation of the Afrikaans name of the mountain. [2]
Isoetes toximontana is an herb which grows in shallow water, very often emerging above the surface. Leaves are 3-10 per plant, up to 42 mm long, elliptical in cross-section. Mega- and microsporophylls may be found on the same plant. Megaspores number up to 36 per sporangium, gray-green, drying olive green, each up to 320 μm in diameter, covered with tubercules (bumps) over most of the surface. Microspores are brown, up to 25 μm in diameter. [3]