Taxonomic history:
   1753: Linnaeus described this species as Piper nigrum in Species Plantarum, 1st ed., p. 28.
   today: The current name for this species is Piper nigrum L.

original Latin diagnosis
Piper foliis ovatis subseptemnerviis glabris, petiolis simplicissimis.

English translation
Piper with leaf blades ovate, nearly seven-nerved, [and] glabrous [and] with petioles strictly simple.

English translation with commentary

Piper	Piper
with leaf blades	foliis - ablative plural of second declension neuter noun folium, -i
ovate,	ovatis - ablative plural neuter of group A adjective ovatus, -a, -um; modifies foliis
nearly seven-nerved,	subseptemnerviis - ablative plural neuter of group A adjective subseptemnervius, -a, -um; modifies foliis
[and]	[added for smoother reading]
glabrous	glabris - ablative plural neuter of group A adjective glaber, glabra, glabrum); modifies foliis
[and]	[added for smoother reading]
with petioles	petiolis - ablative plural of second declension masculine noun petiolus, -i
strictly simple.	simplicissimis - superlative degree, ablative plural masculine of group B adjective simplex, simplex, simplex; modifies petiolis