234 OHIO BIOLOGICAL SURA'EY 



1998. Matricaria chamoinilla L. German ('ainomile. (3ttawa County. 



From Euroj^e. 



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. Connnon Mugwort. Escaped in Lake and 



Cuyahoga Counties. 



2005. Artemisia pontica L. Roman WorniAvood. Champaign, Portage. 



From Europe. 



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



From the AVest. 



2007. Erechtites hieracifolia (L.) Raf. Fireweed. General. 



2008. JMesadenia reniformis (Muhl.^) Raf. Great Indian-plantain. 



Clermont, Greene. 



2009. ]\Iesadenia atriplicifolia (L.) Raf. Pale Indian-plantain. Gen- 



eral. 



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



i\Iontgomery, 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 ^luhl. Roundleaf S(|uaw-weed. Rather general. 



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



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



laize. From Europe. 



2016. Tussilago farfara L. Coltsfoot. Lake, Cu^^ahoga. From Europe. 



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



County. Fi'om Europe. 



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



Europe. 



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



dant. Naturalized from Europe. 



