抄録
Dontostemon dentatus (Cruciferae), critically endangered plant in Japan, was found at Aso in Kyushu Island, and it had been 109 years since the specimen of the species collected in Kumamoto Prefecture last. It grew in a narrow area (70m × 20m) and 78 flowering stems were growing. The habitat of the mountain grassland on volcanic products was new knowledge for this plant.
