An updated key for the genus Asterostigma is presented together with some considerations about the geographic distribution of the genus. A new Brazilian species of Asterostigma CA. lombardii) is also described and illustrated. It occurs in the Brazilian states of Minas Gerais and probably Espfrito Santo and has a seasonally induced dormancy period. Asterostigma lombardii differs from its closest relative [A. riedelianum (Schott) o. Kuntze, from Bahia] mainly because of its boatshaped synandrodes formed by completely connate staminodes and acutely pointed stigma lobes.