
          P.S. July 24


 I do not think that Engelmann's 
 publications on the 
 oaks are of much value.
 Quercus Durandii which was
 described many years ago he
 has placed as a variety of Q.
 stellata. The two oaks have very
 little in common. See wood specimens
 & herbarium specimens 
 in the Jessup collection at the 
 American Museum Central Park.
 Again Quercus San Sabea he
 said was a var. [variety] of Q. undulata
 but Q. San Sabea is certainly
 a well marked variety of 
 Q. Durandii.


 Again in the Plantae Texanae
 of Elihu Hall (plants determined
 by Engelmann) he calls my Quercus
 rubra var. Texana Q. palustris
 & another form of the same oak
 Q. "Phillo-palustris". I know this 
 from Hall's letters to me, &
 having shown him this oak
 near Austin there supposing
 it to be a distinct species which

        