Naturally read this with interest.  Checked with Flora of Bhutan Vol 1 Part 
2 which covers Caryophyllaceae.

The authors have A.thangoensis W.W.Smith (and A.pharensis McNeil &Majumbar) 
only as a synonym of Arenaria
littledalei Hemsley.   What are your thoughts about this?  This account for 
Caryophyllaceae of the region (incl. Sikkim and Chumbi)
was published back in 1984.

This taxon was recorded from Sikkim (Chugya, Naku Chu and Thango) plus 
Chumbi (Phari plain) @ 4360-4570.

I see that 'The Plant List' accept A.littledalei and A.thangoensis as 
separate species.

There are specimens of A.littledalei (from Central Tibet and Sikkim) in the 
Kew herbarium, see: 
http://apps.kew.org/herbcat/getImage.do?imageBarcode=K000723882;  and 
http://apps.kew.org/herbcat/getImage.do?imageBarcode=K000723881

Please explain how these differ from A.thangoensis?

On Sunday, June 5, 2016 at 5:29:15 PM UTC+1, D.S Rawat wrote:

> World environment day is appropriate time to inform our eFI family that in 
> last year’s botanical exploration we managed to rediscover a threatened 
> endemic species from a remote Himalayan locale after nearly 106 years.
>
> *Arenaria thangoensis* W.W.Sm. (Caryophyllaceae) is a tiny plant and this 
> species was described in 1911 from Tangu (Thangu) area of Sikkim in the 
> Eastern Himalaya. This species was never recollected after type collection 
> either from type locality or anywhere in the Himalaya or Tibet and, 
> therefore, known by the type collection only (Srivastava et al. 2015 
> <http://threatenedtaxa.org/index.php/JoTT/article/view/2114/3261>). 
> During a floristic exploration in the Kuari Pass alpine zone (3600-3700m 
> above sea level, Chamoli district, Uttarakhand), which happens to be the 
> type locality of ‘Endangered and endemic’ *Arenaria curvifolia* Majumdar, 
> my student Satish collected *Arenaria thangoensis.* This collection is a 
> rediscovery of this threatened species after 106 years and demonstrates 
> that it is an extant (living) species and thriving well in the area. 
> Rediscovery from nearly 950 km (aerial distance) away from its originally 
> known population makes it more interesting.
>
> Image of the species attached here is a first ever photo of live specimens 
> of this species in the world.
>
> Rediscovering a species is a joy for me and sharing it with ardent nature 
> lovers of eFI fraternity increases it manifolds. 
> This rediscovery is yet not published, though in communication with a 
> journal.
>
> Dr D.S.Rawat
> Department of Biological Sciences, G.B. Pant University of Agriculture & 
> Technology Pantnagar-263 145 Uttarakhand, INDIA
> *eflorapantnagar* <https://sites.google.com/site/eflorapantnagar/home> 
> displaying wild flora of Pantnagar
>

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