
          St Louis Octob 10th

My Dear Sir

Your welcome and interesting letter
of Sept 13 has been in my hands about 10 days and would
have been answered sooner, if Dr Gray had not urged
me to send my manuscript on some of Fendlers plants,
which I had to finish first.

Together with Fendlers I have studied Wislizenus'
Gregg's and Lindheimer's Asclepidaceae, and I believe
have trespassed on your grounds a little in that.  I find
many new species amongst them, and partly of genera
not yet represnted in the flora of the U. States  as
Roulinia, [Nictosteluca?], Sarrostemma, also a number of
new Asclepiades. Wislizenus has collected a fine specimen of
your A. speciosa, and several new ones, and so has
Fendler. Have you examined Gregg's? Among his
I find a new Asclepias from Saltillo, which has also been collected
by Wislizenus about Paso and Chihuahua, and a new Sarcostemma
also coll. by W. about Chihuahua.  He has also collected at Ojita
April 24 an [Amantharix?], which I have received from all 4 collections
very different from A. paniculatus. Lindheimer has sent a 3rd species
of this genus, which I propose to reestablish; It must not be
confounded with [?], as DeCaisne does. Fendler and Wisliz.
have both collected a pretty Asclepias with terminal sessile
umbells, which have a sort of involucrum! 
I shall send in a few days full descriptions to Dr Gray
and ask him to submit them to your criticism.

I am also working at the Euphorbias of those
regions. I have now 26 different forms (I will not yet
say species) of Euphorbiae stipulatae; most of them west.
Fendler has sent a good many of them Lindheimer some,
Wislizenus overlooked them; but Gregg has done finely
Under the name "Golondrina, a sort of Milkweed"
he has sometimes under one label sent sent several fine
species some smooth & glaucous, others hairy. Look
at "Golondrina Valley near Chihuahua 28 & 29 April 47; the same
        