327 - 11th Botany Textbook Volume 1

erecto folius compositis. It means butter
cup with reflexed sepals, curved flower
stalks, erect stem and compound leaves.
Polynomial system did not hold good
as it was cumbersome to remember and
use. Polynomial system of naming a
plant is replaced by a binomial system by
Linnaeus.
Binomial
Binomial nomenclature was first
introduced by Gaspard Bauhin and it
was implemented by Carolus Linnaeus.
Scientific name of a species consists of
two words and according to binomial
nomenclature, the first one is called
genus name and second one is specific
epithet. Example: Mangifera indica.
Mangifera is a genus name and indica is
specific epithet. This system is in vogue
even now.
Author citation
This refers to valid name of the taxa
accompanied by the author’s name who
published the name validly. Example:
Solanum nigrum L. There are two types of
author citation.
Single author: When a single author
proposed a valid name, the name
of the author alone is accompanied
by his abbreviated name. Example:
Pithecellobium cinereum Benth.
Multiple authors: When two or more
authors are associated with a valid
publication of name, their names should be
noted with the help of Latin word et or &.
Example: Delphinium viscosum Hook. f. et
Thomson.
Standard form of author’s abbreviations
has to be followed.
Author
Standard form of
Abbreviation
Linnaeus L.
G.Bentham
Benth.
William Hooker
Hook.
Robert Brown
R.Br.
J.P.Lamarck
Lamk.
A.P.de Candolle
DC.
Wallich
Wall.
Alphonse de Candolle A. DC.
5.5 Type concept
ICN’s second principle states that a
specimen must be associated with the
scientific name known as nomenclatural
type. A nomenclatural type is either
a specimen or may be an illustration.
Example: Herbarium sheet for vascular
plants.
There are different nomenclatural types.
Holotype: A specimen or illustration
originally cited by the author in
protologue. It is a definitive reference
source for identity. Citation of holotype
and submission of it is one of the criteria
for valid publication of a botanical name.
Isotype: Duplicate specimen of the
holotype collected from same population by
same person on same date with same field
number. They are the reliable duplicates of
holotype and may be distributed to various
herbaria of various regions.
Lectotype: Specimen selected from
original material serves as a type, when
no holotype was designated at the time of
publications or if holotype is missing or
destroyed.
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