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 invasive plants
 
 
Cabomba (Cabomba caroliniana)Cabomba  (or  fanwort). has small  emerged white  flowers and a  dense underwater vegetation, which  can become an  obstacle to  navigation.
It was  introduced   from   fish tanks and is  known to  propagate  by careless boat  users who  don't  clean their hull  and trailer when leaving  a site.
 Two-penny grass (Lysimachia Nummularia)    
Water Chestnut (Trapa natans) This  Asian plant  is unrelated to  the water chestnut  of Chinese restaurants.
Its  leaves are arranged in an attractive floating rosette, with  a small  white  flower at  its   center Each   fruit contains a nut  and has 4 nail-sharp spikes that  can injure the  bare-footed wader.		  
Near Church lane Water lettuce (Pistia stratiotes)

Arum family

 It  is unclear if  it  is native to  the US  
Also named marsh seedbox, Onagraceae family, native to Florida, mostly introduced by fishtanks owners Water Purslane (Ludwigia palustris)    
Garlic Mustard [invasive](Alliaria petiolata)

Unlike  most  invasives, which  grow  mostly  in disturbed areas, garlic mustard invades established woodlands.

 

  
(syn. Fallopia japonica, Reynoutria japonica) invasive, difficut to eradicate Near Davidsons Mill Pond Japanese Knotweed (Polygonum cuspidatum)  
Mugwort (Artemisia vulgaris)  
Vinca invasion in Davidsons Mill Pond Park Periwinkle (Vinca minor)

Invades established woodlands. 

Vinca invasion in Davidsons Mill Pond Park

 
Invasive (crowds out native species); syn. Chinese tearthumb Mile-a-minute (Persicaria perfoliata)    
Also named "Oriental Staff Vine",Oriental Bittersweet, Japanese Bittersweet or Asiatic Bittersweet Bittersweet (Celastrus orbiculatus)

A wait-and-grow plant;  it  remains almost  dormant in wooded areas  until  sunlight becomes  abundant, then it  grows aggressively, sometimes covering   the  tallest trees.

This  plant was introduced from Europe as a popular Christmas ornamental plant.

Note : several plants are commonly named bittersweet.

  
native to temperate areas of Asia. Porcelain Berry (Ampelopsis brevipedunculata)    
Ravine totally invaded by English ivy (near Westoms Mill Pond) English  Ivy  (Hedera helix)

Here English ivy has  totally invaded several ravines along  the  Westons Mill Pond.

Invades established woodlands. 

 

  
Common Reed  (Phragmites australis) Invades sunny  flood areas    
  Japanese Honeysuckle (Lonicera japonica)

Introduced in the late 19th C. as an ornamental plant.

  
Tree of Heaven (Ailanthus altissima). Tree of  Heaven  (Ailanthus altissima)

Grows in disturb  areas. When crushed, it  leaves release an typical unpleasant odor.

  
  Norway  Maple (Acer platanoides) This  introduced tree takes  the place of native red maples in disturbed areas. Prone to  diseases  after some years.  
Invasive plant, native to Asia. Notice the clusters of many small berries. Multiflora Rose  (Rosa multiflora)

Native to Asia;   creates  impenetrable bushes. Not to  be confused with  swamp  rose, a desirable native rose.

    
See section ' invasive plants' Autumn  Olive (Elaeagnus umbellata),

A nitrogen-fixing  plant, it  can even grow in poor soils. Attract  many  birds in the fall.  Leaves are alternate

  
Opposite leaves, invasive and toxic. (Not to be confused with Elaeagnus spp., w. alternate leaves.) Bush  Honeysuckle Lonicera maacki)

 It  has  toxic fruitd and . could  be confused with  autumn  olive, which has berries at the same time. However its  leaves  are opposite.

  
 
If not  removed from the boat  trailer, those  aquatic plants (here Cabomba) may  contaminate another body of  water.  Careless boaters create the problem that  will  keep  them out of the  water.