Sorry this is not C.buchananiana but Clematis connata. Probably C.connata var. pseudoconnata (which some recognise at a higher rank) but one cannot see the base of the petioles, which are likely to be dilated and connate forming disc-like structures.   Some are very large/pronounced. The line drawing in eflora of Pakistan does not show this feature. Always helpful to be able to view both upper and lower surface of leaves.

These two species are often mixed-up but C.connata has glabrous foliage whilst C.buchananiana is often markedly hairy (esp. on undersides of leaves).

'Flora of Kathmandu Valley' says occurs in dry areas from 1600-2600m for C.buchananiana; 2400-2700m for C.connata. They describe flowers of latter as "golden-brown", which is questionable- perhaps a specimen which had gone over?

I consider +/- all the images identified as C.buchananiana, see: https://sites.google.com/site/efloraofindia/species/m---z/r/ranunculaceae/clematis/clematis-buchananiana in fact come within Clematis connata

Important to check for presence of disc-like structures on future occasions (these will vary in prominence). Often 'glabrous' does not mean entirely without hairs. Typical C.buchananiana is decidedly hairy.

I saw what I understand to be genuine C.buchananiana beyond Naini Tal some years back but do not have any images to share. Collet said C.buchananiana was common at Shimla but it seems nobody has photographed the genuine species and sent images to efloraofIndia. 

Cannot find many reliable images of C.buchananiana on internet- a number have been misidentified. See: https://www.google.co.uk/search?q=%22Clematis+buchananiana%22&tbm=isch&gws_rd=ssl#gws_rd=ssl&imgrc=xGyWRRGO0HaS0M%3A

If you take a look at the pressed specimens collected by Blinkworth in Kumaon see: http://apps.kew.org/herbcat/getImage.do?imageBarcode=K001039669 and by Wallich (or for Wallich - as many of his specimens were gathered on his behalf) see: http://apps.kew.org/herbcat/getImage.do?imageBarcode=K001039670 you will be convinced of the markedly different foliage cf. C.connata and lack of 'connate' petiole bases.

There will be variants that have less 'softly hairy' undersides to the leaves.

I have checked the images for C.connata and these look OK (though the image by ... in VOF has unusual foliage (more images of all the features would be helpful to check its identity further) to me with the 'connate' feature being drawn attention to.  See: https://sites.google.com/site/efloraofindia/species/m---z/r/ranunculaceae/clematis/clematis-connata

Those who live/visit suitable places, should keep a look out in forests & shrubberies @ 1800-3000m. Stewart found C.connata to be common in Kashmir and N.Pakistan @ 1500-2700m. C.buchananiana he only recorded from Kashmir at Tangmarg and Banihal Valley plus Verinag (though 2 of these records were 19th Century).

All the evidence suggests C.connata is common in the NW Himalaya, C.buchananiana less so.

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