Taxonomic history:
   1753: Linnaeus described this species as Piper peltatum in Species Plantarum, 1st ed., p. 30.
   today: The current name for this species is Piper peltatum L. (The spelling of the specific epithet as “pelatum” in both edition 1 and edition 2 of Species Plantarum is likely a typesetting error.)

original Latin diagnosis
Piper foliis peltatis orbiculato-cordatis obtusis repandis, spicis umbellatis.

English translation
Piper with leaves blades peltate, orbiculate-cordate, obtuse, [and] repand; [and] with spikes umbellate.

English translation with commentary

Piper	Piper
with leaf blades	foliis - ablative plural of second declension neuter noun folium, -i
peltate,	peltatis - ablative plural neuter of group A adjective peltatus, -a, -um; modifies foliis
orbiculate-cordate,	orbiculato-cordatis - orbiculato- (combining form of group A adjective orbiculatus, -a, -um) + cordatis (ablative plural neuter of group A adjective cordatus, -a, -um); modifies foliis
obtuse,	obtusis - ablative plural neuter of group A adjective obtusus, -a, -um); modifies foliis
[and]	[added for smoother reading]
repand;	repandis - ablative plural neuter of group A adjective repandus, -a, -um; modifies foliis
[and]	[added for smoother reading]
with spikes	spicis - ablative plural of first declension feminine noun spica, -ae
umbellate.	umbellatis - ablative plural feminine of group A adjective umbellatus, -a, -um; modifies spicis