234 OHIO BIOLOGICAL SURVEY 



1998. Matricaria chamomilla L. German Camomile. Ottawa County. 



From Europe. 



1999. Matricaria matricarioides (Lees.) Port. Rayless Camomile. 



Stark County. From the Pacific coast. 

 2000.. Tanacetum vulgare L. Common Tansy. General. Naturalized 

 from Europe. 



2001. Artemisia caudata Mx. Wild "Wormwood. Erie County. 



2002. Artemisia annua L. Annual Wormwood. Rather general. In- 



troduced. 



2003. Artemisia biennis Willd. Biennial Wormwood. Ashtabula, Cuy- 



ahoga, Lucas, Auglaize, Shelby, Wyandot, Franklin. 



2004. Artemisia vulgaris L. Common Mugwort. Escaped in Lake and 



Cuyahoga Counties. 



2005. Artemisia pontica L. Eoman Wormwood. Champaign, Portage. 



Prom Europe. 



2006. Artemisia gnaphalodes Nutt. Prairie Cudweed. Lake County. 



Prom the West. 



2007. Erechtites hieraeifolia (L.) Raf. Pireweed. General. 



2008. Mesadenia reniformis (Muhl.) Raf. Great Indian-plantain. 



Clermont, Greene. 



2009. Mesadenia atriplicifolia (L.) Raf. Pale Indian-plantain. Gen- 



eral. 



2010. Mesadenia tuberosa (Nutt.) Britt. Tuberous Indian-plantain. 



Montgomery, Champaign, Logan. 



2011. Synosma suaveolens (L.) Raf. Sweet-scented Indian-plantain. 



Cuyahoga, Lorain, Stark, Clark, Jackson. 



2012. Senecio aureus L. Golden Squaw-weed. General. 



2013. Senecio obvatus Muhl. Roundleaf Squaw-weed. Rather general. 



2014. Senecio panperculus Mx. Balsam Squaw-weed. Ottawa County. 



2015. Senecio vulgaris L. Common Groundsel. Lake, Lorain, Aug- 



laize. Prom Europe. 



2016. Tussilago farfara L. Coltsfoot. Lake, Cuyahoga. Prom Europe. 



2017. Arctium tomentosum (Lam.) Schk. Woolly Burdock. Erie 



County. From Europe. 



2018. Arctium lappa L. Great Burdock. Lorain, Cuyahoga. Prom 



Europe. 



2019. Arctium minus Schk. Common Burdock. General and abun- 



dant. Naturalized from Europe. 



