In 1828 he was in Trieste where he carried out mapping and published "Uebersicht der Vegetation in den Umgebungen Triest's; von Hrn.
His best-known work was the Nomenclator Botanicus Hortensis, an index of the botanical names of garden plants.
In 1846 the "Botanischen Centralblatt für Deutschland" listed him as a private scholar in Dresden.
In total he was responsible for naming some 426 plant species.
Arabidopsis was the first plant to have its genome sequenced, and is frequently used as a model for understanding the molecular biology of many plant traits, including flower development and light sensing.