|Eastern skunk cabbage|
|Skunk cabbage in early spring|
Symplocarpus foetidus, commonly known as skunk cabbage, eastern skunk cabbage, swamp cabbage, clumpfoot cabbage, meadow cabbage, foetid pothos or polecat weed, is a low growing, foul smelling plant that prefers wetlands. Native to eastern North America, it ranges from Nova Scotia and southern Quebec west to Minnesota, and south to North Carolina and Tennessee. It is protected as endangered in Tennessee.
Eastern skunk cabbage has leaves which are large, 40–55 cm (15.75–21.5 in) long and 30–40 cm (12–15.75 in) broad. It flowers early in the spring when only the flowers are visible above the mud. The stems remain buried below the surface of the soil with the leaves emerging later. The flowers are produced on a 5–10 cm (2–5 in) long spadix contained within a spathe, 10–15 cm (4–6 in) tall and mottled purple in colour. The rhizome is often 30 cm (1 ft) thick.
Breaking or tearing a leaf produces a pungent but not harmful odor, the source of the plant's common name; it is also foul smelling when it blooms. The plant is not poisonous to the touch. The foul odor attracts its pollinators, scavenging flies, stoneflies, and bees. The odor in the leaves may also serve to discourage large animals from disturbing or damaging this plant which grows in soft wetland soils.
Eastern skunk cabbage is notable for its ability to generate temperatures of up to 15–35 °C (27–63 °F) above air temperature by cyanide resistant cellular respiration in order to melt its way through frozen ground, placing it among a small group of plants exhibiting thermogenesis. Even though it flowers while there is still snow and ice on the ground it is successfully pollinated by early insects that also emerge at this time. Some studies suggest that beyond allowing the plant to grow in icy soil, the heat it produces may help to spread its odor in the air. Carrion-feeding insects that are attracted by the scent may be doubly encouraged to enter the spathe because it is warmer than the surrounding air, fueling pollination.
Eastern skunk cabbage has contractile roots which contract after growing into the earth. This pulls the stem of the plant deeper into the mud, so that the plant in effect grows downward, not upward. Each year, the plant grows deeper into the earth, so that older plants are practically impossible to dig up. They reproduce by hard, pea-sized seeds which fall in the mud and are carried away by animals or by floods.
In the 19th century the U.S. Pharmacopoeia listed eastern skunk cabbage as the drug "dracontium". It was used in the treatment of respiratory diseases, nervous disorders, rheumatism, and dropsy. In North America and Europe, skunk cabbage is occasionally cultivated in water gardens. Skunk cabbage was used extensively as a medicinal plant, seasoning, and magical talisman by various tribes of Native Americans. While not considered edible raw, because the roots are toxic and the leaves can burn the mouth, the leaves may be dried and used in soups and stews.
- Lysichiton americanus (western skunk cabbage): also known for producing a foul smell, and often confused with eastern skunk cabbage
- Lysichiton camtschatcensis (Asian skunk cabbage): from north-east Asia, but not known for producing a foul smell
- Kew World Checklist of Selected Plant Families
- USDA PLANTS Database: S. foetidus
- Thorington, Katherine K.: "Pollination and Fruiting Success in the Eastern Skunk Cabbage", The Journal of Biospheric Science , vol 1 no. 1 April 1999, accessed March 4, 2007, <http://www.mtholyoke.edu/courses/mmcmenam/journal.html
- Marinelli, Janet: "Turning Up the Heat on Your Property", Backyard Habitat – National Wildlife Magazine, vol. 45 no. 1 Dec/Jan 2007, accessed March 3, 2007, <http://www.nwf.org/nationalwildlife/article.cfm?issueID=112&articleID=1418
- Flora of North America: S. foetidus
- Dr. Moerman's Native American Ethnobotanical Database: S. foetidus
|Wikimedia Commons has media related to Symplocarpus foetidus.|
|Wikiversity has bloom time data for Symplocarpus foetidus on the Bloom Clock|