The publication - dates of Colla's "Plantæ Rariores in Regionibus Chilensibus a Clarissimo M.D. Bertero Nuper Detectæ" and "Herbarium Pedemontanum." - Pichi Sermolli, Rodolfo E. G. 1912-2005 (Istituto Botanico Dell'Universita, 1951)
"The purpose of this paper is to try to establish the dates of publication of Colla's papers and consequently to fix the date and publication of the new genera and species described by him on Bertero's specimens from Chile."