Argostemma sarmentosum Wall., Fl. Ind. 2: 324 1824. ;
Himalaya to Bangladesh: Bangladesh, East Himalaya, Nepal, West Himalaya as per POWO;
As per efi thread:
Flowers with 4 petals…..A.sarmentosum;
flowers with five petals…… A. verticillatum


Flora of Chakrata 2013:: One More Stone Flower.. : Attachments (4 + 1 + 1).  5 posts by 2 authors.
This white flowered herb was also found growing on rocks in Chakrata area.. I could get this identified..
help requested..

Appears as a species of Agrostemma (Rubiaceae). (But where are stamens?).

Thanks … for the input, no exserted stamens were seen in any of the specimens observed…
and perhaps you wanted to say “Argostemma” instead of “Agrostemma


Perhaps this picture can help, not a clear view but this shows exserted stamens ..
thanks … for helping, so this can be Argostemma sarmentosum


To me too it looks A.sarmentosum. Attaching an old pic taken near Jeolikot on way to Naini Tal.

Thanks … for confirming the identification as Argostemma sarmentosum


AKNOV01 Argostemma sp. for ID :  4 posts by 2 authors. No images seen now.
Found near Mussoorie, Aug 2014

Excellent pics …
Argostemma sarmentosum in my opinion is reported from the area, to which this strictly resembles..


Need Id assistance : 3 posts by 2 authors. Attachments (3)

I need id assistance for following species collected from Darjeeling
Locality: Pankabari Ridge, Kurseong Subdiv.
Alt.: 3000 ft
Date: 29.07.2014
Corolla white, deciduous, not scented
Status: seen only 2 populations

Argostemma sarmentosum Wall. (Rubiaceae) to me. Often along streams on moss covered shady slopes.

Many many Thanks … for your id assistance.

Sonerila for ID_RKC_290311:
Loc.: On way to Churdhar, Himachal Pradesh (ca 1500m)
Date: August, 2010.

Could this be a species of Argostemma???

Yes Argostemma courtallense Arn. of Rubiaceae family.
What was the altitude.
From stream side, I guess.

Yes … you are right
it is Argostemma courtallense