Talk:Water caltrop

Invasiveness information

The following text was added to Chinese water chestnut, but I believe it was intended for this article. Although it is good first effort for a new editor, I have placed it here rather than directly in the article because I believe it needs to be rewritten and referenced.

Confusing or surprising claims particularly deserving clarification:

• An aquatic plant has been declared a noxious weed in the largely desert state of Arizona.
• It has been declared a nuisance in three states where it does not occur (Arizona, North Carolina, and South Carolina), but not in three of the four states where it does occur (Maryland, New York, and Pennsylvania).
• Problematic populations occur in the Potomac River, but not in Virginia, a large part of whose northern border is defined by that river.

The same editor contributed some descriptive information, which I merged into this article.

— Pekinensis 16:52, 29 August 2005 (UTC)

User:Wiki skylace reverted the comment about invasiveness because "The referenced article does not call this plant an invasive species." Allow me to quote from the article:

• The article is by "R. W. Pemberton - Invasive Plant Research Laboratory"
• The article is taken from "Biological Control of Invasive Plants in the Eastern United States"
• Water caltrop "is an aquatic weed of the northeastern United States that can dominate ponds, shallow lakes, and river margins (Fig. 2). It displaces native vegetation and limits navigation and recreation."
• "This weed is difficult and expensive to control, and if unmanaged can increase dramatically. When the plant occupies a site, most recreational activities such as swimming, fishing from the shoreline, and the use of small boats are eliminated or severely impeded."
• "The specific geographic origins of the T. natans genotype(s) that has become a problem in the United States are unknown."
• "T. natans continues to be a problem that requires expensive control efforts."

So, while it's true that the word "invasive" doesn't occur within the body of the article, it's abundantly clear that the article identifies it as invasive. Waitak 16:47, 17 July 2007 (UTC)

_

Water chestnut has become such a nuisance in the US as to be declared a noxious weed in Arizona, Massachusetts, North Carolina and South Carolina. It shares this honor with kudzu, another plant native to Asia. Both plants are edible. Presently, water chestnut can be found in Maryland, Massachusetts, New York and Pennsylvania, with most problematic populations occurring in the Connecticut River valley, Lake Champlain region, Hudson River, Potomac River and the upper Delaware River.

Water chestnut can form dense floating mats, severely limiting light -- a critical element of aquatic ecosystems. This plant can also reduce oxygen levels, which may increase the potential for fish kills. It competes with native vegetation and is of little value to waterfowl. Water chestnut infestations limit boating, fishing, swimming and other recreational activities.

Old name: Water calthrop ?

I'm not sure I understand your question. Could you expand? Are you asking about the spelling, "caltrop" vs "calthrop"? — Pekinensis 18:09, 13 September 2005 (UTC)

i found this name written like above in piekarski- medical parasitology about 1962.

old form of the name ?

see morew names !:http://www.google.com/search?hl=de&q=%22water+calthrop%22&btnG=Suche&meta=

I believe it is only a misspelling of caltrop, but of course I can't be sure. — Pekinensis 14:44, 17 September 2005 (UTC)

Confusion?

The photograph used seems to show Trapa bicornis, not Trapa natans as the legend implies. Would a botanist confirm, please? --Gak

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T. natans in Washington...

Very doubtful - In fact I believe the intention was to mean Washington, DC - not Washington State. Yes it is listed as "Washington" on the Reference Note#4 . Note that is a USDA document {Federal Government}.

Haven't really found a "Trapa" reference in Washington State documents. Particularly of note, neither the 2008 and/or 2010 Noxious Weed List of Washington State. Additionally, any reference to "Trapa" is for the 'East Coast'.