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The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.




Aeschynomene fluitans
Aeschynomene fluitans
(giant water sensitive plant)
Plants
Exotic

Copyright Info
Aeschynomene fluitans Peter

Common name: giant water sensitive plant

Synonyms and Other Names: Botswana wonder, water pea, golden Botswana, giant sensitive plant, large leafed sensitive plant

Identification: According to Verdcourt (2000):

Habit: perennial, floating, aquatic forb

Stems/Roots: hollow to spongy stems and dense adventitious roots.

Leaves: pinnately compound leaves up to 8 cm with 16-26 pairs of leaflets; leaflets 9-25 mm long, typically glabrous, blue-green in color; margin entire or finely serrate. Leaves close slowly when touched, as in Mimosa spp.

Flowers: solitary, yellow, papilionacious flowers in the leaf axils.

Fruits/Seeds: segmented loment (indehiscent legume) is straight or slightly curved and 1.5-5 cm long with a ridge around the margin.

Look-a-likes: other jointvetch species (Aeschynomene spp.) in the US have similar leaves and flowers, but are not aquatic, floating plants.

Size: 1 to 4.5 m total length (Verdcourt 2000)

Native Range: Southern Africa (Angola, Botswana, Democratic Republic of the Congo, Namibia, Tanzania, Zambia) (Verdcourt 2000)

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Aeschynomene fluitans are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
FL201120172Peace; Tampa Bay
LA200720071Liberty Bayou-Tchefuncta

Table last updated 10/19/2021

† Populations may not be currently present.


Ecology:

Habitat: slow-moving rivers, ponds, and floodplains (Verdcourt 2000).

Tolerances: reported hardy in USDA zones 8-11 (Florida Aquatic 2008, Pond Megastore Wholesale Waterlilies Department 2017) where average annual minimum temperatures range between -12° and 4.4° C (10° to 40° F) (USDA-ARS 2012).

Community: associated with other aquatic and riparian plant species in native Botswana and Namibia, such as Ceratophyllum, Cyperus, Ludwigia, Mikania, Mimosa, Nymphaea, Persicaria, Phragmites, and Schoenoplectus (Ellery and Tacheba 2003, Strohbach 2013).

Means of Introduction: This plant is available for sale in the US as an ornamental pond plant through the internet and various nurseries and catalogs (Allen et al. 2017). Improper disposal or intentional release by a home-owner is the most likely initial pathway.

Status: The status of the Lousiana population is unknown; a waste water treatment facility just downstream of Lake Arrow Wood may serve to reduce the number of viable seeds or plant fragments dispersing downstream to the Abita River (K. Rust, pers. comm. 2007). The SW Florida population is established and has likely spread from Lake Dosson into neighboring Sunshine Lake (L. Holland, pers. comm. 2017).

Remarks: The habit, leaves and fruit match specimens from native range. Sample or detailed photograph of flower required to confirm to species (G. Lewis, pers. comm. 2007).

References: (click for full references)

Agricultural Research Service, U.S. Department of Agriculture (USDA-ARS). 2012. USDA Plant Hardiness Zone Map. http://planthardiness.ars.usda.gov. Accessed on 08/28/2017.

Allen, K., R.T. Isaacson, C. Aho, S. Cross, and C.R. Jensen. 2017. Aeschynomene fluitans | Plant Information Online. https://plantinfo.umn.edu/node/1445007. Accessed on 08/28/2017.

Ellery, W.N., and B. Tacheba. 2003. Floristic Diversity of the Okavango Delta, Botswana. Pages 69-96 in Alonso, L.E., and L. Nordin, eds. A Rapid Biological Assessment of the Aquatic Ecosystems of the Okavango Delta, Botswana: High Water Survey. RAP Bulletin of Biological Assessment 2. Conservation International. Washington, D.C.

Florida Aquatic. 2008. Aeschynomene fluitans. http://floridaaquatic.com/surface_aeschynomene_fluitans.html. Accessed on 08/28/2017.

Franck, A.R. (curator). 2015. University of South Florida Herbarium (USF). University of South Florida, Tampa, FL. http://www.florida.plantatlas.usf.edu/.

Holland, L. 2017. Personal Communication.

Lewis, G. 2007. Personal Communication.

Pond Megastore Wholesale Waterlilies Department. 2017. Botswana Wonder | Aeschynomene fluitans | Large Sensitive. https://wholesalewaterlilies.com/collections/floating-pond-plants-wholesale-distributor/products/botsawana-wonder-aeschynomene-fluitans. Accessed on 08/28/2017.

Rust, K. 2007. Personal Communication. Absolute Aquatics, Inc.

Strohbach, B. 2013. Vegetation of the Okavango River valley in Kavango West, Namibia. Pages 321-339 in Oldeland, J., C. Erb, M. Finckh, and N. Jürgens, eds. Environmental Assessments in the Okavango Region. Volume 5. Biodiversity & Ecology.

Verdcourt, B. 2000. Papilionideae. Page 175 pp in Pope, G.V, ed. Flora Zambesiaca. Volume 3, Part 6. Royal Botanic Gardens. Kew, Richmond, UK. http://plants.jstor.org/stable/10.5555/al.ap.flora.fz2618.

Other Resources:

Aeschynomene fluitans - Species Page - ISB: Atlas of Florida Plants (photos and vouchers)

Flora of Zimbabwe (photos and record details)

Author: Pfingsten, I.A.

Revision Date: 10/11/2018

Citation Information:
Pfingsten, I.A., 2021, Aeschynomene fluitans Peter: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2730, Revision Date: 10/11/2018, Access Date: 10/19/2021

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.

Disclaimer:

The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2021]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [10/19/2021].

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