My Dear Sir
The Physianthus is from Buenos Ayres. We here know it to be hardy. I agree with you that it is a remarkable fact. Who shall assign a reason for a plant being hardy or not?
Sir J. Herschels <1> plant is a Monopsis, but in the present confusion concerning Lohliaceous[?] plants I have not time to determine the species.
As to Compositæ provided they do not belong to Hieraceum or some such [illegible] genus & there is not many of them I’ll see what I can do. But if you will study De Candolles book <2> you will not find their identification is difficult as you apprehend. Dried specimens I prefer to fresh ones.
I am anxious to figure yr Dianthus: so send it up by all means.
Aug. 17. 1837.
1. Sir John Frederick William Herschel (1792–1871), astronomer & scientist.
2. Augustin Pyramus (or Pyrame) de Candolle (1778-1841), Swiss botanist; and his son, Alphonse Louis Pierre Pyrame de Candolle (1806-1893), French-Swiss, originally a lawyer before turning to botany.