Isoetes louisianensis
| Isoetes louisianensis | |
|---|---|
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Lycophytes |
| Class: | Lycopodiopsida |
| Order: | Isoetales |
| Family: | Isoetaceae |
| Genus: | Isoetes |
| Species: | I. louisianensis
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| Binomial name | |
| Isoetes louisianensis Thieret
| |
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| Range of Isoetes louisianensis | |
Isoetes louisianensis, the Louisiana quillwort, is a small, grass-like aquatic plant of the family
Washington Parishes of Louisiana, as well as some spots in southern Mississippi and south-central Alabama.[3] It is federally listed as an endangered species, partly due to its highly restricted range.[4]
The Louisiana quillwort occurs predominantly on sand and gravel bars on small to medium-sized streams. These plants live for periods underwater. They are regularly inundated as much as 50 centimeters (20 inches) following rains, and may be inundated for long periods in wet seasons. Its
Distinctive characteristics of this species include brown-spotted sporangial walls and megaspores with highly reticulate ridges, producing a spiny effect. The leaves are up to 40 cm long.
The Louisiana quillwort was described recently, in 1973, and was listed as an endangered species in 1992.[4]
References
- ^ "Isoetes louisianensis". NatureServe Explorer. NatureServe. Archived from the original on April 15, 2013. Retrieved 2007-12-19.
- ^ a b I. louisianensis. Archived 2010-12-15 at the Wayback Machine Center for Plant Conservation.
- ^ Mississippi Ecological Services Field Office. (2011). Louisiana quillwort (Isoetes louisianensis) 5 Year Review: Summary and Evaluation. U.S. Fish and Wildlife Service. https://esadocs.defenders-cci.org/ESAdocs/five_year_review/doc3996.pdf
- ^ a b USFWS. Determination of Endangered Status for the Plant Isoetes louisianensis (Louisiana Quillwort). Federal Register October 28, 1992.