A Herbalogical Study in the Plants of Labiatae in Korea. For the purpose of developing Korean Herbgalogy with the plants of Labiatae which grow wild and is planted in korea, the these and writings on herbalogy, from literature of successive generations, have been throughly investigative and the results obtained were as follows: 1. There were totaled to 27 genera and 86 species in Korea and among them medical plants are 24 genera, 59 species, some 68% in total but, the number of species may be added because of the similar plants. 2. According to the oriental names which can be used for medical purpose, the medical plants belonging to the Labiatae family were classified as Herba 29, Radix 4, Fructus 3, Folium 2, Lignum 2, Semen 1 and Flos 1. 3. According to sum of 86 species in Labiatae family, they were classified into Scutellaria genera 10, Salvia genera 6, Ajuga genera 5, Clinopodium genera 5, Elsholtzia genera 5 and Mosla 5. Thus it was noticed that Scutellaria genera was the main kind some 12% in total. 4. According to the number of species of the original plants about each chinese materia medicals, they were classified into HERBA AGASTACHIS 5 and HERBA AJUGAE, HERBA SCUTELLARIAE, HERBA LYCOPI 3 each. 5. According to nature and flavour of medical plants, they were classified into warmth, heat: 20 each, cold, cool: 16 each, balance 4 and unidentified 2. Thus it was noticed that warmth and heat is the main in nature and flavour medicinal plants. 6. According to the Properties and Principal curative action, they were classified into drugs for clearing up heat and toxin 8, drugs for clearing up heat and dispelling pathogenic heat from blood, drugs for clearing up heat and heatstroke 3 each, drugs for activating the blood and removing blood stasis, drugs which is sudorific and pungent in nature and flavour for dispelling wind and cold in the treatment of exterior symptom complex 4 each. Thus it was noticed that drugs for clearing up heat was the main kind. 7. Comparing to whole medical plants 42 kinds, toxic drugs include minor toxin were 3 kinds, 7% of the whole. Thus toxic drugs were rare. From this result, it was revealed that the plants for medical purpose in Labiatae was 68% of the whole, in which HERBA was mostly abundunt and toxic plants was so rare that it will be used for clinical treatment more easily. It is considered that many experiements and clinical approches must be continued to use Labiatae plants widely.