Thanks Sir for throwing light on the matter in detail On Wed, Aug 10, 2011 at 9:49 AM, Gurcharan Singh <[email protected]> wrote:
> Yes Pankaj ji > Here is the information from my book (some things must have missed copy > pasting from Pagemaker) > > *Names of Hybrids* > Hybridity is indicated by the use of the multiplication sign, or by the > addition of the prefix ‘notho-’ to the term denoting the rank of the taxon, > the principal ranks being nothogenus and nothospecies. A hybrid between > named taxa may be indicated by placing the multiplication sign between the > names of the taxa; the whole expression is then called a hybrid formula: > 1. Agrostis X Polypogon > 2. Agrostis stolonifera X Polypogon monspeliensis > > 3. Salix aurita X S. caprea > It is usually preferable to place the names or epithets in a formula > in alphabetical order. The direction of a cross may be indicated by > including the sexual symbols ( : female; : male) in the formula, > or by placing the female parent first. If a non-alphabetical sequence is > used, its basis should be clearly indicated. > A hybrid may either be interspecific (between two species belonging to > the same genus) or intergeneric (between two species belonging to two > different genera). A binary name may be given to the interspecific hybrid or > nothospecies (if it is self-perpetuating and/or reproductively isolated) by > placing the cross sign (if mathematical sign is available it should be > placed immediately before the specific epithet, otherwise ‘x’ in lower case > may be used with a gap) before the specific epithet as in the following > cases (hybrid formula may be added within the parentheses if the parents are > established): > 1. Salix x capreola (S. aurita X S. caprea) > or Salix Xcapreola (S. aurita X S. caprea) > 2. Rosa x odorata (R. chinensis X R. gigantea) > or Rosa Xodorata (R. chinensis X R. gigantea) > The variants of interspecific hybrids are named nothosubspecies and > nothovarieties, e.g. Salix rubens nothovar. basfordiana. > For an intergeneric hybrid, if given a distinct generic name, the name > is formed as a condensed formula by using the first part (or whole) of one > parental genus and last part (or whole) of another genus (but not the whole > of both genera). A cross sign is placed before the generic name of the > hybrid, e.g. XTriticosecale (or x Triticosecale) from Triticum and Secale, > XPyronia (or x Pyronia) from Pyrus and Cydonia, and Agropogon from Agrostis > and Polypogon.. The names may be written as under: > 1. XTriticosecale (Triticum X Secale) > 2. XPyronia (Pyrus X Cydonia) > The nothogeneric name of an intergeneric hybrid derived from four or > more genera is formed from the name of a person to which is added the > termination -ara; no such name may exceed eight syllables. Such a name is > regarded as a condensed formula: > XPotinara (Brassavola X Cattleya X Laelia > X Sophronitis) > The nothogeneric name of a trigeneric hybrid is either: (a) a > condensed formula in which the three names adopted for the parental genera > are combined into a single word not exceeding eight syllables, using the > whole or first part of one, followed by the whole or any part of another, > followed by the whole or last part of the third (but not the whole of all > three) and, optionally, one or two connecting vowels; or (b) a name formed > like that of a nothogenus derived from four or more genera, i.e., from a > personal name to which is added the termination -ara: > XSophrolaeliocattleya (Sophronitis X Laelia X Cattleya) > When a nothogeneric name is formed from the name of a person by adding > the termination -ara, that person should preferably be a collector, grower, > or student of the group. > A binomial for the intergeneric hybrid may similarly be written as under: > XAgropogon lutosus (Agrostis stolonifera X Polypogon monspeliensis) > > It is important to note that a binomial for an interspecific hybrid has a > cross before the specific epithet, whereas in an intergeneric hybrid, it is > before the generic name. Since the names of nothogenera and nothotaxa with > the rank of a subdivision of a genus are condensed formulae or treated as > such, they do not have types. > Since the name of a nothotaxon at the rank of species or below has a > type, statements of parentage play a secondary part in determining the > application of the name. > The grafts between two species are indicated by a plus sign between two > grafted species as, for example, Rosa webbiana + R. floribunda. > > > > -- > > Dr. Gurcharan Singh > Retired Associate Professor > SGTB Khalsa College, University of Delhi, Delhi-110007 > Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. > Phone: 011-25518297 Mob: 9810359089 > http://people.du.ac.in/~singhg45/ > > > On Tue, Aug 9, 2011 at 8:08 PM, Dr Pankaj Kumar <[email protected]>wrote: > >> Trinomial Nomenclature if not found in plants but they exist in >> animals. >> Like >> >> Cervus eldi eldi. >> Panthera tigris corbetti >> >> etc. >> >> These are actually not subspecies or varieties. >> >> To me, Bi-generic name is a different thing and even there are >> trigeneric names and they do exist in plants especially among hybrids. >> Like Aranda = Aerides + Vanda >> Sophrolaleocatleya = Sophronitis + Laelia + Cattleya. >> >> I hope I am on the right track. >> >> Pankaj >> >> >> >> >> >> >> On Aug 7, 6:54 pm, Gurcharan Singh <[email protected]> wrote: >> > Shinde ji >> > >> > Could you kindly provide some more information about this reference? A >> > bigeneric name generally is formed by combining the first part (or >> whole) of >> > one genus and second part (or whole) of second genus. The classical >> example >> > is X*Triticosecale* (Triticum aestivum x Secale cereale). Of course >> there >> > is no binomial available for this, being man-made hybrid. >> > >> > Binomials are available for some naturally formed intergeneric hybrids. >> Here >> > is an example: >> > >> > X*Agropogon lutosus* (Agrostis stolonifera X Polypogon monspeliensis) >> > >> > Trinomials we generally use for infraspecic taxa. I would be interested >> to >> > know what trinomial is meant in this reference. >> > >> > -- >> > Dr. Gurcharan Singh >> > Retired Associate Professor >> > SGTB Khalsa College, University of Delhi, Delhi-110007 >> > Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. >> > Phone: 011-25518297 Mob: 9810359089http://people.du.ac.in/~singhg45/ >> > >> > >> > >> > >> > >> > >> > >> > On Sun, Aug 7, 2011 at 6:15 PM, Rajendra Shinde <[email protected]> >> wrote: >> > > Hello, >> > >> > > I have come across a reference of Trinomial or Bi generic names by M. >> Cato >> > > ( De Re Rustica). Tried to search on these for few examples but could >> not >> > > locate it. Can any one throw some light on these names? any examples? >> > >> > > Thanks >> > >> > > Shinde >> > > > > -- Regards Dr Balkar Singh Head, Deptt. of Botany and Biotechnology Arya P G College, Panipat Haryana-132103 09416262964
