Fig. 667: Physostegia Digitalis: a, inflorescence and upper stem, x V2: b, leaf, x 

 V-y, c, inflorescence and upper 5 nodes of stem, x ij; d, flower, x 7. (a-c, from Lundell's 

 Flora of Texas, Vol. 2, pi. 25; d, Courtesy of R. K. Godfrey). 



