Image of Cosmos palmeri Robinson

Description:

in sunny shallow swales, cracks and pot holes on flat portions of the ridge top of exposed rhyolitic tuff forming the Continental Divide This species is largely distinguished with difficulty from C. pringlei by a 2 cm difference in maximum width of the flowering heads which make photo determination impossible and pressed specimen difficult, without careful in-field measurements of live mature heads. In most cases I have placed these similar plants under C. palmer, the slightly smaller and more common of the two species