Thanks for drawing my attention to this LIST OF INVASIVE SPECIES, which I shall
check-with and no doubt refer to, from time-to-time.
I shall no doubt question SOME of the identifications!
In light about my post covering Primula malacoides and other 'naturalised'
exotic species,I immediately raise a question about the SINGLE entry under
Opuntia. The authors have O.stricta Haw. but NOT the commonO.monacantha Haw. -
which is illustrated and described in 'Flowers of the Himalaya'.
Stewart lists both in his Catalogue covering Pakistan & Kashmir. O.monocantha
being cultivated as far west as the Indus and ascending to1200m. Naturalised in
Sind.
Whereas he only has O.stricta from Sind and Lahore brick kiln mounds (according
to Parker - so a century old record).
I am uncertain what constitutes INVASIVE as opposed to NATURALISED but whatever
the PRECISE definition (and there needs to be one), I am surprised that
O.stricta should be classified as such UNLESS this species has become INVASIVE
in recent decades?
I see both species have entries in eFI (not attempted to verify the
identifications) and both are accepted names in 'The Plant List' - though other
authorities might not agree and no doubt revisions will take place from
time-to-time.
Certainly quite a number of species recognised within this genus - so imagine
not easy to distinguish between all of them.
I wonder how authors of the list of 'Invasive' species in India distinguished
between O.monocantha and O.stricta?
Best Wishes,
Chris Chadwell
81 Parlaunt Road
SLOUGH
SL3 8BE
UK
www.shpa.org.uk
From: D.S Rawat <[email protected]>
To: efloraofindia <[email protected]>
Cc: [email protected]; [email protected]
Sent: Friday, 27 January 2017, 8:07
Subject: Re: ALIEN & ADVENTIVE plant species in India
List of invasive alien species of India is available at following link:
http://www.bsienvis.nic.in/Database/Invasive_Alien_species_15896.aspx
Though, we still do not have a list of flowering plants of India !
DSRawat Pantnagar
On Thursday, January 26, 2017 at 10:24:16 AM UTC+5:30, JM Garg wrote:
Thanks, Chadwell ji.
---------- Forwarded message ----------
From: C CHADWELL <chrischadwell261@btinternet. com>
Date: 26 January 2017 at 09:11
Subject: ALIEN & ADVENTIVE plant species in India
To: "J.M. Garg" <[email protected]>
When posting images of a plant it is HELPFUL that an indication is given as to
whether thespecimen was growing in the wild or cultivated. Just because a
plant is not in a park, garden orfield is not alone an indication of whether it
is a NATIVE species. Some introduced species becomenaturalised and it can be
difficult to tell they are not 'wild' or not, particularly if the photographer
isnot familiar with genera typically cultivated as crops or ornamental purposes.
It is of significance whether a plant occurs naturally. Much is talked about
CONSERVATION. It makessense to concentrate our concerns about NATIVE species
and NOT introductions. Some of the most eye-catching plants may well be
INTRODUCTIONS - unfortunately, some are INVASIVE and troublesome.
Where I live (and thus most frequently botanize) has MANY Alien plant species.
Where I live in the UK is within the old county of Buckinghamshire (nowadays
the newish boundary puts mein Berkshire). For recording purposes of The
Botanical Society of Britain & Ireland (BSBI) I remainin 'Buckinghamshire'. I
have a copy of the 'Flora of Buckinghamshire' from 1926; it is fascinating
tocompare the abundance (or not) of species then with nowadays - there have
been many changes duringthe past century. The same no doubt applies in India.
Collet's 'Flora Simlensis' (1921) allows a comparisonwith present day Shimla
and surrounding areas.
There is not an up-to-date Flora for Buckinghamshire but the useful 'A
CHECKLIST OF THE PLANTS OFBUCKINGHAMSHIRE' Maycock & Woods (2005) is available.
In it they include, in alphabetical order by genus and species, both NATIVE and
ALIEN taxa. 'Native' taxa arethose believed to be in Buckinghamshire entirely
due to natural processes. 'Alien' taxa are those that have beenintroduced to
Buckinghamshire by human activity (intentionally or accidentally). Those long
established in GreatBritain (i.e. before 1500) are known as ARCHAEOPHYTES;
those established since 1500 are NEOPHYTES. Otheraliens are listed as 'Casual'
if they do not maintain themselves in the county by seed or vegetative means,
or areobviously planted.
Why 1500? The first of four voyages across the Atlantic by Italian Explorer
Christopher Columbus took place in 1492and led to the introduction of plant
material. The Romans introduced quite a number of plants into Great Britain.
Best Wishes,
Chris Chadwell
81 Parlaunt Road
SLOUGH
SL3 8BE
UK
www.shpa.org.uk
--
With regards,
J.M.Garg'Creating awareness of IndianFlora & Fauna'Winner of Wipro-NFS Sparrow
Awards 2014 for efloraofindia.
For identification,learning, discussion & documentation of Indian Flora, please
visit/ joinour EfloraofindiaGoogle e-group (largestin the world- around 2700
members & 2,40,000 messages on 31.3.16) orEfloraofindia website (with a species
database of more than11,000 species & 2,20,000 images). The whole world uses my
Image Resource of more than a thousand species & eight thousand images of
Birds, Butterflies, Plants etc. (arranged alphabetically & place-wise). You can
also use them for free as per Creative Commons license attached with each
image.Also author of 'APhotoguide to the Birds of Kolkata & Common Birds of
India'.
--
You received this message because you are subscribed to the Google Groups
"efloraofindia" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send an email to [email protected].
Visit this group at https://groups.google.com/group/indiantreepix.
For more options, visit https://groups.google.com/d/optout.
