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...at Lakes]] region and was first spotted in 1843<ref>{{cite web |title=List of invasive species in the Great Lakes Great Lakes United / Union Saint-Lauren ...shaped, and often lobed at the base. The [[flower]]s are in loose clusters of 3–20, (1–1.5&nbsp;cm) across, star-shaped, with five purple petals and

[[Image:Illustration Helleborus niger0.jpg|thumb|19th century illustration of ''Helleborus niger'']] [[Image:Helleborus foetidus0.jpg|thumb|right|The small green flowers of ''H. foetidus'' often have a purple edge to each 'petal']]

...ermplasm Resources Information Network |publisher=United States Department of Agriculture |date=1998-03-09 |accessdate=2010-06-26}}</ref> ...m the old Latin name for the flower. Oleander is one of the most poisonous of commonly grown garden plants, and can be very toxic if ingested in sufficie

...Genome Sciences |publisher=[[University of Maryland, Baltimore|University of Maryland Medical School]] |accessdate=2009-03-09}}</ref> Castor seed is the source of [[castor oil]], which has a wide variety of uses. The seeds contain between 40% and 60% oil that is rich in [[triglycer

...ropagation|propagation]], the combustible material present, and the effect of weather on the fire.<ref name=UToronto /> ...cial effects on wilderness areas. Some plant species depend on the effects of fire for growth and reproduction,<ref name=NOVA /> although large wildfires