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- Title
A Brief History of Purple Loosestrife, Lythrum salicaria, in Manitoba and its Status in 2001.
- Authors
Lindgren, Cory J.
- Abstract
Purple Loosestrife (Lythrum salicaria L.) has become recognized as an invasive alien plant having deleterious impacts on Manitoba's natural areas. The first herbarium specimen of Purple Loosestrife was collected in 1896 near Neepawa followed by infestations in 1944 at Lockport and in 1951 in Winnipeg. As of 1991 there were 38 known populations of Purple Loosestrife in Manitoba. By the fall of 2001, there were a known 492 populations covering an estimated 5575 ha of habitat. These data indicate a 13-fold increase in the number of Purple Loosestrife infestations between 1991 and 2001 in Manitoba. The majority of Purple Loosestrife (77.6%) was found in central Manitoba infesting 4324 ha. The Netley-Libau Marsh, located in central Manitoba accounted for 26% of all Purple Loosestrife in Manitoba. Central Manitoba (42.6%) had the majority of all Purple Loosestrife infestations followed by the city of Winnipeg (41.4%), eastern Manitoba (9.9%) and western Manitoba (6.1%), Purple Loosestrife was commonly found in roadside ditches (46%), river banks (25%) and wetland habitats (10%,). Typha spp., Phalaris arundinacea and Carex spp. were commonly associated with Purple Loosestrife infestations. Infestations ranged from one plant to thousands of plants. Of the infestations surveyed, 9% had over 1000 plants while 52% had under 100 plants.
- Subjects
MANITOBA; CANADA; PURPLE loosestrife; LYTHRUM; LYTHRACEAE; PLANT invasions
- Publication
Canadian Field-Naturalist, 2003, Vol 117, Issue 1, p100
- ISSN
0008-3550
- Publication type
Article
- DOI
10.5962/p.353867