navigation
Previous Plant Next Plant

xxxHome
x
xAbsinth wormwood
x
xAlligatorweed
x
xAmerican Lotus
x
xAmerican Pondweed
x
xAmpelopsis
x
xAustralian Pine
x
xBaccharis
x
xBamboo
x
xBanana Passionflower
x
xBarnyard Grass
x
xBermuda Grass
x
xBirdsfoot Deervetch
x
xBlack Locust
x
xBlack Mustard
x
xBlue Lettuce
x
xBrazilian Elodea
x
xBrazilian Peppertree
x
xBufflegrass
x
xBull Thistle
x
xBulrush
x
xBurdock
x
xButtonbush
x
xCanada Thistle
x
xCattails
x
xCheatgrass
x
xCherry Silverberry
x
xChinaberry
x
xChineese Lespedeza
x
xChinese Bush Clover
x
xChinese Privete
x
xChinese Tallow Tree
x
xClimbing Hempweed
x
xCogon Grass
x
xCommon Buckthorn
x
xCommon Cocklebur
x
xCommon Reed
x
xCommon Sowthistle
x
xCoontail
x
xCottonwood
x
xCrownvetch
x
xCurlyleaf Pondweed
x
xDalmation Toadflax
x
xDiffuse Knapweed
x
xDuckweed
x
xDyer's Woad
x
xElephant Ears
x
xElodea
x
xEnglish Ivy
x
xEurasian Watermilfoil
x
xEuropean Stickseed
x
xField Bindweed
x
xField Mustard
x
xField Sowthistle
x
xFloating Heart
x
xFloating Primrose
x
xFlowering Rush
x
xFragrant Water-Lilly
x
xGallant Solder
x
xGarlic Mustard
x
xxGiant Foxtail
x
xGiant Reed
x
xGiant Salvinia
x
xGlossy Buckthorn
x
xGorse
x
xHalogeton
x
xHempnettle
x
xHimalayan Raspberry
x
xHoary Cress
x
xHorsenettle
x
xHorseweed
x
xHoundstongue
x
xHydrilla
x
xIvy Gourd
x
xJapanese Barberry
x
xJapanese knotweed
x
xJohnson Grass
x
xJointed Goatgrass
x
xKlamath Weed
x
xxKochia
x
xKoster's Curse
x
xKudzu
x
xLeafy Spurge
x
xLimnophila
x
xLongspine Sandbur
x
xMalaleuca
x
xMedusahead
x
xMiconia
x
xMimosa
x
xMiramar Weed
x
xMultiflora Rose
x
xMusk Thistle
x
xNepalese Brown Top
x
xNorway Maple
x
xOld World Climbing Fern
x
xOrange Hawkweed
x
xOxeye Daisy
x
xPale Yellow Iris
x
xPaper Mulberry
x
xPara Grass
x
xParrotfeather
x
xPerenial Pepperweed
x
xPeriwinkle
x
xPlumeless Thistle
x
xPoison Hemlock
x
xPorcelainberry
x
xPrincess Tree
x
xPuncturevine
x
xPurple Loosestrife
x
xPurple Starthistle
x
xPupletop Vervain
x
xQuackgrass
x
xQueen Anne's Lace
x
xRedroot Pigweed
x
xReed Canarygrass
x
xRice Cut-Grass
x
xRiviere Golden Bamboo
x
xRussian knapweed
x
xRussian Thistle
x
xSalvinia minima
x
xScotch Broom
x
xScotch Thistle
x
xSkeleton Weed
x
xSlender Naiad
x
xSmartwed
x
xSmooth Brome
x
xSouthern Naiad
x
xSpatter-Dock
x
xSpiny Naiad
x
xSpotted Knapweed
x
xStrawberry Guava
x
xSulfur cinquefoil
x
xSunflower
x
xSwallowworts
x
xTamarisk/Salt Cedar
x
xTansy Ragwort
x
xTeasel
x
xTexas Blueweed
x
xTorpedo Grass
x
xTree of Heaven
x
xTropical Soda Apple
x
xTumble Pigweed
x
xUruguayan Primrose
x
xVariable-Leaf Milfoil
x
xWater Buttercup
x
xWater Chestnut
x
xWater Moss
x
xWater Paspalum
x
xWater Shield
x
xWater Hyacinth
x
xWater Lettuce
x
xWater Willow
x
xWestern Water Hemlock
x
xWhite Sweetclover
x
xWhitetop
x
xWild Mustard
x
xWild Parsnip
x
xWillows
x
xYellow Nutsedge
x
xYellow Starthistle
x
xYellow Toadflax


Giant Salvinia - Salvinia molesta
Family: Salviniaceae

play video

TpIUC

Description

Giant salvinia is a free floating aquatic fern. An individual plantlet consists of a horizontal stem that produces two floating leaves (fronds) up to 25 cm long and a highly dissected submerged frond up to 25 cm. The floating leaves are green, sessile to short petiolate, broadly ovate in shape with entire margins. The midrib extends from the base to the apex of the leaf. The upper surface of the floating fronds is covered with parallel rows of hairs that have a characteristic "cagelike" structure at the apex. When plants are young, these leaves are small and float on the water surface. As plants age, the floating leaves become crowded and fold against one another resulting in a more vertical leaf position. The brown, feathery submerged leaf resembles and functions as a root. This frond bears the sporocarps or spore forming structures. The globose sporocarps are densely hairy, short stalked and 2-3 mm in diameter. Spores are rarely formed and if present are deformed and infertile.

Interesting facts

Salvinia molesta is native to southeastern Brazil. Introduction of the mat forming fern is thought to have arisen from the water gardening and/or aquarium trade where plants are either sold directly or occur as contaminants in water garden stock

Giant salvinia grows best in stagnant or slow flowing water. Quiet waters of lakes, ponds, bays, oxbows, ditches, swamps, and marshes may be susceptible to invasion. In Ceylon, the species has proven to be problematic in rice fields. The rhizomatous plant can rapidly form dense floating mats of vegetation. Disturbance usually results in fragmentation and any fragment having an axillary bud can give rise to a new plant. The optimum temperature range for growth is 25-28 C and under these conditions plants can double within 1 week.

Giant salvinia can impact irrigation systems, navigable waters, fisheries, electric power production, and rice farming. Giant mats reduce light penetration and result in oxygen depletion. As light becomes limiting, it affects the growth and survival of phytoplankton and vascular plants. Oxygen depletion may be so severely reduced beneath a mat that it influences fish survival. Extensive mats may exacerbate a situation because they prevent water circulation and mixing.


VIDEO


Links to more information


Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers

 

New Biology Video Podcast The Wild Classroom Biology Concepts Biodiversity Home