Sweet William Silene Invasive Plant Information


Sweet William Silene has been reported in the following 34 states:

Alaska, Connecticut, District Of Columbia, Georgia, Illinois, Indiana, Maryland, Minnesota, Montana, New Hampshire, North Carolina, Pennsylvania, South Carolina, Utah, Vermont, Wisconsin, Oregon, West Virginia, Arkansas, California, Delaware, Florida, Iowa, Louisiana, Maine, Massachusetts, Michigan, Missouri, New Jersey, New York, Ohio, Rhode Island, Virginia, Washington


Images of Sweet William Silene:



Information about Sweet William Silene:


The following information is licensed as Creative Commons content from Wikipedia and the USDA.
More information about Sweet William Silene may be found here, or from the US Department of Agriculture.

Silene armeria, commonly known as the Sweet William catchfly, is a plant of the family Caryophyllaceae. Originally a native of Europe, it has become widespread in the USA. Perennial in USDA plant hardiness zones 5 to 8. A small-growing form is known as dwarf catchfly. The name comes from the way in which small insects are trapped by the sticky sap exuded onto the stem. However it is not currently regarded as a carnivorous plant, though it has been identified as a carnivorous plant in the past.

The plant between 20-70 cm in height. Leaves numerous 2.5-5 cm long, elliptic, oval, or narrowly oval, smooth. Blooming period in British Isles - June-July. Clusters of pink or lavender flowers arranged somewhat openly or compactly at end of stems. Stem hairless (glabrous) or slightly hairy with sticky areas, especially just below the cluster.
A plant native of Europe in roadsides, weedy places. Has been introduced to North America and latter escaped cultivation become an invasive species.
Some parts of plant are poisonous if ingested.
WCSPF defines the following Silene armeria L. synonyms:
The source marks all these WCSPF synonym entries as "low confidence" and "awaiting review". Silene lituanica that has been described as species in 1911 was still considered species by Lithuanian botanists in 2009 and as such is included into the list of extinct and endangered species of Lithuania since 1962.


Other links with information about Sweet William Silene:


Reported Urban
Infected Regions:

Lakes, AK
Knik-fairview, AK
Wasilla, AK