a. Some names of Towns and Countries are masculine: as, Sulmó, Gabií (plur.); or neuter, as, Tarentum, Illyricum.
b. A few names of Plants and Gems follow the gender of their termination: as, centauréum (N.), centaury; acanthus (M.), bearsfoot; opalus (M.) opal.
NOTE: The gender of most of the above may also be recognized by the terminations, according to the rules given under the several declensions. The names of Roman women were usually feminine adjectives denoting their g=ens or house (see §108. b).