aff. - affinis -- having affinity with but not identical to
auct. - auctorum -- of authors [written like that by various authors]
aust. - australis -- southern, from the south [sometimes related to 'from Australia']
bor. - borealis -- northern, from the North
ca. - circa -- about [refers to dates]
cf. - confer -- compare with
c.v. - curriculum vitae -- curriculum of life
e.g. - exempli gratia -- for example
et al. - et alii -- and others
etc. - et cetera -- (and the rest), and so on
ex. - exemplar -- example or specimen [the plural is written exx.]
ex. er. - ex errore -- made in error
f. - forma -- form
ibid. - ibidem -- from the same place
id. - idem - the same
i.e. - id est -- that is (to say), or in other words
in coll. - in collectionem -- in the collection [usually followed by the name of a collection or museum]
inc. s. - incertae sedis -- of uncertain placement
indet. - indeterminans -- unidentified
in litt. - in litteris -- in correspondence
leg. - legit -- he, she, or it collected
loc. cit. - loco citato -- in the place [work, paper, etc.] cited
mer. - meridionalis -- southern, from the South
n.b. - nota bene -- take good note
nom. nud. - nomen nudum (plural: nomina nuda) -- a name published without an accompanying description
nom. dub. - nomen dubium (plural: nomina dubia) -- a name of questionable application
nom. illeg. - nomen illegitimum (plural: nomina illegitima) -- an illegitimate name
nom. cons. - nomen conservandum (plural: nomina conservanda) -- a conserved name
nom. prot. - nomen protectum (plural: nomina protecta) -- a name granted protection
nom. supp. - nomen suppressum (plural: nomina suppressa) -- a name that has been suppressed and cannot be used
nom. rej. - nomen rejiciendum (plural: nomina rejicienda) -- a name that has been rejected and cannot be used
nom. obl. - nomen oblitum (plural: nomina oblita) -- a name which has been overlooked and is no longer valid
nom. nov. - nomen novum (plural: nomina nova) -- a replacement name
nom. van. - nomen vanum (plural: nomina vana) -- a failed emendation
occ. - occidentalis -- western. from the West
op. cit. - opere citato -- in the work cited
or. - orientalis -- eastern, from the East
p. - pagina -- page [singular; plural is paginae, abbreviated pp.]
s.l. - sensu lato -- in the broad sense
sept. - septentrionalis -- northern, from the North
sp. - species -- species [singular; plural is species, abbreviated as spp.]
sp. nov. - species nova -- new species [singular; plural is species novae, abbreviated as spp. nov.]
ssp. - subspecies -- subspecies [singular; plural is subspecies, abbreviated sspp.]
s. str. - sensu stricto -- in the strict sense
q.v. - quod vide -- see (for which, see)
var. - varietas -- variety (used for Plants)
viz. - videlicet -- namely