He was among the first botanists to describe the new plants then being discovered in Alaska (under Russian ownership at the time), including species now of major commercial importance like Sitka Spruce and Red Alder. The specimens he described were mostly collected by Carl Mertens at Sitka, Alaska.
"Historical Sketch of the Progress of Botany in Russia from the Time of Peter the Great to the Present Day", (translated from the "Recueil Des Actes de Pétersbourg de 1834"); Curtis's Botanical Magazine. Companion to the Botanical Magazine ... By W.J. Hooker. Vol. 1. pp. 117–186, (1836)
Plantae quatuor brasilienses novae (with Carl Bernhard von Trinius), 1839.
This article incorporates text based on a translation of an equivalent article at the German Wikipedia, listed as: Robert Zander, Fritz Encke, Günther Buchheim, Siegmund Seybold (eds.): Handbook of Plant Names . 13th Edition. Ulmer Verlag, Stuttgart 1984, ISBN 3-8001-5042-5