The International Nepenthes Grex Registry


Grex: A grex is defined as the all offspring resulting from the crossing of two individual plants, i.e., the grex parents, as defined below. Note that a grex is therefore NOT defined as the crossing of two species or hybrids; rather, a grex is defined as the crossing of two individual plants or "clones". Several examples on the Grex Nomenclature page will help illustrate the difference. Because individual plants are either male or female (Nepenthes as a rule are monoecious), grex registrations are sex-respective by default.

Parent: A parent plant is an individual plant, or a genetically identical copy of that plant (e.g., a cutting or tissue cultured copy). Thus a parent plant represents the expression of a unique genome in one or more plants. In lay terms, a parent plant is a "clone". Although parent plants are referred to by species, hybrid, or grex names, the parent plants themselves are individuals belonging to those species, hybrids, or greges, and not the species, hybrids, or greges themselves.

The following definitions refer to the terms employed in the Grex Nomenclature.

Grex1: Primary grex epithet. This is the name chosen and assigned by the breeder to a particular grex. In a new grex, this name becomes fixed with the registered derivation and is retained in all future registered greges of the same derivation.

Grex2: Secondary grex epithet. This is the secondary name chosen and assigned to a grex by the breeder under the conditions defined here.

(A x B): A shorthand notation for a record of derivation. For the purposes of the registry, the genetic derivation of a plant is to be expressed in a formula recording the female plant first and the male plant second, i.e., (N. maxima x ventricosa), in which maxima is the female parent and ventricosa is the male. Complex crosses having more than two species as ancestors are to be described in the same fashion, employing set theory-type bracketing to clearly define the order of the crosses involved, and factored to the species level.

(HE): Shorthand for "Histroical Epithet" and signifying that the particular grex in question is a remake of a cross that appears in the ICPS or other historical hybrid database.

(NE): Shorthand for "Natural Epithet" and indicates the species or natural hybrid name.

Date: This is the date of pollination in the format YYYY-MM-DD. The day portion is not required but retained when supplied by the registrant.

Breeder: This is the breeder's name and, when available, the nursery of origin.

Pictorial Descriptions

Pictures of the plant should be representative of the entire plant to allow for the determination of its general growth pattern and foliar display characteristics. While pitcher photos are necessary, breeders/registrants are encouraged to submit photos of all the parts of their plants. Below are examples of the kinds of photographs sought:
  1. Frontal/angle view of a typical lower pitcher
  2. Frontal/angle view of a typical upper pitcher
  3. View of leaf detail and attachment
  4. View of inflorescence
  5. View of pitcher lid
  6. View of peristome details
  7. View of stem details

Pictures may include a scale for reference when possible.

Special Definitions:

x': Non-specific cross with regard to female parent.

N. x Miranda: The actual derivation of N. x Miranda is proprietary. For registry purposes, N. x Miranda is defined as N. (northiana x maxima) x maxima.

N. x Gentle & N. x Velvet: The actual derivation of these two hybrids is proprietary. For registry purposes, both are defined as N. maxima x fusca.