<![CDATA[Image RSS Feed for Image Collection 349 - Selected Images for water-chestnut (Trapa natans) in Invasive Species Most Unwanted - Selected Images only]]> http://www.ipmimages.org/collections/viewcollection.cfm?id=349 Overview

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Trapa natans is a rooted, floating plant that invades shallow to deep, fresh water habitats in the northeastern United States. It can grow in 12-15 ft. (3.6-4.6 m) of water and forms dense, floating mats, often three layers deep.

Foliage

The rosette of leaves on the surface of the water are alternate, triangular in shape, strongly dentate (toothed) and connected to the stem by an inflated petiole. Submerged leaves are feathery and either opposite or alternate.

Flowers

Trapa natans has small, four-petaled flowers that bloom from July to frost.

Fruit

The nut-like fruit has two to four, 0.5 in. (1.3 cm) long, sharp, barbed spines. They ripen in about a month and can remain viable as long as 12 years. Each seed can produce 1-15 rosettes and each rosette can produce as many as 20 seeds. The spines can penetrate shoes.

Ecological Threat

The dense, floating mats of Trapa natans restrict light availability, reduce the oxygen content, and displace other emergent and floating vegetation. It also limits boating, fishing, swimming and other recreational activities. Trapa natans is native to Europe and Asia and was first observed in the United States in Massachusetts in the late 1800s.

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Thu, 28 Mar 2024 13:51:40 -0400 Thu, 28 Mar 2024 13:51:40 -0400 http://Images.bugwood.org/ <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5274095 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5274095 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=2308042 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=2308042 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5274097 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5274097 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5274098 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5274098 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=0002120 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=0002120 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=2308043 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=2308043 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5309017 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5309017 <![CDATA[European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5309016 European water chestnut Trapa natans]]> http://www.ipmimages.org/browse/detail.cfm?imgnum=5309016