[6] Post formally described 221 taxa, and published an extensive volume on the Flora of Syria, Palestine and Sinai in 1896.

[7] Later, a new and revised edition of Post's seminal work was published posthumously in 1932–1933 by John Edward Dinsmore, entitled Flora of Syria, Palestine, and Sinai: Volume 1: A Handbook of The Flowering Plants and Ferns, Native and Naturalized From The Taurus to Ras Muhammad And From the Mediterranean Sea to The Syrian Desert, Vol I and II,[8][9] and which includes a description of many new plants, including Iris hermona.

[10] In 1875, Pierre Edmond Boissier and Charles Isidore Blanche published Postia (in the Asteraceae family), it is now a synonym of Rhanteriopsis lanuginosa.

[11] Then in 1985, botanist Evgeniy Vasilyevich Kljuykov published Postiella, which is a monotypic genus of flowering plants belonging to the family Apiaceae and named in Post's honour.

[12][13] For his work as a surgeon and missionary, he received the Order of the Red Eagle from the Kingdom of Prussia.