(poa <- taxon_name("Poa"))
(undef <- taxon_name("undefined"))
(sp1 <- taxon_name("species 1"))
(poa_annua <- taxon_name("Poa annua"))
(x <- taxon_name("Poa annua L."))
x$name
x$database
(x <- taxon_name(
"Poa annua",
database_list$ncbi
))
x$rank
x$database
# a null taxon_name object
taxon_name(NULL)
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