Perhaps this is Dr. Agustín Stahl puertorikansky famous scientist, engaged in scientific issledovaniyami in the field of botany, arheologii, ethnology, medicine, zoology.
Here is some information about it:
http://botany.si.edu/Antilles/PRFlora/stahl/
http://en.wikipedia.org/wiki/Agustín_Stahl
has participated in many expeditions, wrote watercolors.