The Troad belongs in a botanical point of view to the least known countries of Asia-Minor. Though this country has been visited or wandered through by several of the most renowned botanical travellers, such as Forskål (1761) and Dumont d'Urville (1819), who merely visited the island of Tenedos, Olivier (1794 and 1798), Sibthorp (1794?), Barker Webb and Parolini (1819), Aucher-Eloy and Gust. Coquebert de Montbret (1833), who explored the Troad proper, yet these explorations did not lead to detailed communications on the plants of the regions visited, because some of the travellers named visited the Troad in an unfavourable season, midsummer or autumn, whilst others did not publish anything on their collections, of which only some species have here and there become known. At least as much, therefore, as to the botanists by profession, if indeed not more, are we indebted for our knowledge of the Trojan flora to travellers, who besides their principal archaeological, geological, or geographical objects of study, paid also attention to the ever-attractive children of Flora; such were Clarke (1801), Tchihatcheff (1849), Julius Schmidt (1864), and Rudolf Virchow (1879); supplementary information has also been received from Frank Calvert (1879 and 1880). The collections of the three last-named explorers are for the most part given here for the first time (that of J. Schmidt according to the communications of Th. von Heldreich).