Names are taken from external databases such as UniProt, Gramene, European Nucleotide Archive, GeneDB, WormBase, SGD.
You can search for your gene by name or identifier by typing in the search box.
You can also use a name or an identifier to directly link to the appropriate page the site.
For example, you can construct a link such as this: http://www.ensemblgenomes.org/id/AT3G52430
This will take you the appropriate page in Ensembl Genomes. If the search term matches more than one entity, the link will take you to a page of the search results instead.
Once already on a gene page in Ensembl Genomes, you can also change to another gene by just replacing the gene name directly at the end of the URL.
See a few examples here:
Gene Sb01g042000 in Sorghum bicolor, Ensembl Plants: http://plants.ensembl.org/Sorghum_bicolor/Location/View?db=core;g=Sb01g042000 (
Gene lacZ in Escherichia coli K12 MG1655, Ensembl Bacteria: http://bacteria.ensembl.org/escherichia_coli_str_k_12_substr_mg1655/Gene/Summary?g=lacZ
Gene CLAG3.1 in Plasmodium falciparum, Ensembl Protists: http://protists.ensembl.org/Plasmodium_falciparum/Gene/Summary?g=CLAG3.1