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IUCN/SSC Invasive Species Specialist Group (ISSG)/Features
Tonga, as in French Polynesia. It grows in dense stands, commonly with other weedy species. The seeds are wind-dispersed. Wedelia trilobata (Singapore daisy) ... Niue and eradication efforts there are ongoing. Psidium cattleianum (strawberry guava), a small tree that forms dense thickets. It is a major problem species in a number of island ecosystems including ...
www.issg.org

Invasive Non-Native Plants
Dutch elm disease. It forms dense thickets under which nothing else grows. Its small oval leaves have a single tooth. ... of the forest understory, eventually killing them, and changing the open structure of the forest into a dense tangle. DO NOT PLANT NEXT TO OPEN SPACE. KUDZU (Pueraria lobata), the vine that smothered the ...
www.mdflora.org

Report on invasive plant species in Niue
It is quite prevalent on most Pacific islands. Pennisetum purpureum (elephant grass) forms dense stands and is the most troublesome grass on Niue. Solanum torvum (prickly solanum, devil' ... can gradually spread into forested ecosystems. In the case of vines and plants that form dense ground cover, the regeneration of native species can be inhibited. Some of these species could ...
hear.org

Report on invasive plant species on Tonga
It reproduces from root suckers and can form dense thickets, crowding out other species. Clerodendrum quadriloculare is suspicious because it appears to have the ... cultivated). The seeds are bird-dispersed. Psidium cattleianum (strawberry guava) is a small tree that forms dense thickets. It is a major problem species in a number of island ecosystems including ...
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Invasive Tree Species
Moist deciduous woods Description : 40 m high, needles straight, stiff, sharp, dark green, cones cylindrical, 10-18 cm long Usage : Ornamental Invasive Potential : P Control Method(s) : 4, 6 Additional Comments : Forms dense evergreen storey Pinus sylvestris Common Name(s) : Scots pine, Scotch pine Origin : Europe Status : Available Provincial Location(s) : BC, SK, AB, MB, ON, QC, NF, NB, NS, ...
www.rbg.ca

Invasive Shrubs and Vines
Perennial, 1-1.5 m, loose, delicate white flowers, long canes, prickly stem, fruits aggregation of drupes, black Invasive Potential : P Usage : Ornamental Control Methods : 1, 2 Additional Comments : Forms dense thickets Syringa vulgaris Common Name(s) : Lilac Origin : Europe Status : Available Provincial Location : SK, ON, QC, NF, NB, NS Habitat : Old homesteads Description: 5 m high, flowers ...
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Acroceras macrum
Uses A very palatable grass and rather extensively cultivated as pasture and hay, especially in the highyield areas of South Africa. Forms dense cover used for grazing and haymaking. Unsuitable for leys, as it is difficult to eradicate. Very useful as fodder source during dry season. The grass has been described, perhaps hyperbolically, as "the king of fodder ...
www.hort.purdue.edu

NCNatural Guide - Coastal Flowers of NC
North Carolina a bay is low, wet forest that is dominated by the Loblolly Bay tree which forms dense thickets and is very hard to get through. (We generally call our bodies of water that are protected by land "Sounds".) The Loblolly Bay is at the northern limit of its range in NC. It is a predominant plant ...
www.ncnatural.com

Herbaceous Invasive Species
Description : Biennial, 1-1.5 m high, purple disk flowers, 2 cm long, leaves alternate, stem spiky, erect Usage : Weed Invasive Potential : P Control Method(s) : 3 Additional Comments: Forms dense stands Centaurea maculosa Common Name(s): Spotted knapweed Origin : Europe Status : Available Provincial Location(s) : BC, SK, AB, MB, ON, QC, NF Habitat : Mountain meadows Description : ...
rbg.ca

Poison Ivy
Great Plains. Aromatic Sumac (Rhus aromatica) Also known as Skunkbush, Aromatic Sumac forms dense thickets up to 7 feet tall. It is native to the eastern half of the U. S. ... will be found on rocky outcroppings and fence rows. Its berries are red and densely hairy and form in dense clusters. While in the same family as Poison Ivy, it does not contain urushiol. Box Elder (Acer ...
gpnc.org