Aristolochia saccata

Aristolochia saccata Wall., Pl. Asiat. Rar. 2: 2 1830. (Syn: Aristolochia cathcartii Hook.f.; Siphisia saccata (Wall.) Klotzsch);

Images by Khyanjeet Gogoi & Dushyant Parasher (Validation by J.M.Garg) (Inserted by J.M.Garg) (For more photos & complete details, click on the links)
I found this growing on ground under a bush, in a place called 'Gabrukunda' in Sep. 2007, in the very less frequented eastern most part of Manas National Park, adjoining Bhutan hills.
A very similar picture exists on the following link. Will appreciate confirmation of ID and would like to know, is it rare of common?
Both pictures look alike to a laymen like me.,+04-Aug-2020+14:49:04+GMT
Attaching images of Aristolochia cathcartii Hook. f. a big woody climber from Jeypur RF, Assam