Blue-stem or Woodland or Wreath Goldenrod , verge d’or bleuâtre
Solidago caesia L. is a common woodland goldenrod in eastern North America.
The stems are usually bluish to purple, glaucous and arching and the heads occur in small clustered subtended by large upper stem leaves (Semple & Cook 2006 FNA). The species is diploid 2n=18 throughout its range (Cook & Semple 2008).
Two varieties were recognised in FNA based on work by R.E. Cook (Cook & Semple 2008; Cook et al. 2009).
Cook, R.E. and J.C. Semple. 2008. The cytogeography of Solidago subsect. Glomeruliflorae (Asteraceae: Astereae). Botany 86: 1488-1496.
Last update 7 November 2013 by J.C. Semple
© 2013 J.C. Semple, including all photographs unless otherwise indicated