piperaceous

from The Century Dictionary.

• Of or belonging to the Piperaceæ or pepper tribe of plants.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) Of or pertaining to the order of plants (Piperaceæ) of which the pepper (Piper nigrum) is the type. There are about a dozen genera and a thousand species, mostly tropical plants with pungent and aromatic qualities.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany Of or pertaining to the order of plants, Piperaceae, of which the pepper is the type.