Reinwardtia cicanoba (Buch.-Ham. ex D. Don) H. Hara (As per efi thread: Reinwardtia cicanoba (Syn: Reinwardtia tetragyna), which is supposed to have bigger leaves and bigger flowers as compared to the Yellow Flax (Reinwardtia indica). It is found in the Himalayas.
For me, a clear difference between the two is that Reinwardtia cicanoba flowers have a longer tube than Reinwardtia indica flowers, which is what makes them look like a morning glory.
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BSI Flora of India with details & keys (Volume 3- 1993) (Distribution):
Reinwardtia cicanoba (Buch.-Ham. ex D. Don) Hara (India: Eastern Himalayas, Sikkim and Meghalaya; Nepal and China)
Reinwardtia indica Dumort. (India: Throughout; Pakistan, Nepal, Bhutan, Myanmar, Thailand, Indo-China and China)  


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Binomial Habit Notes Ref. Distrib.
Reinwardtia
indica
Dumort.
Small Shrub Western Ghats,
Evergreen Forests
Flora of Tamil
Nadu, VOL. I, 1983
Nilgiri  

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Botanical name Synonyms Family Common name
Reinwardtia cicanoba Reinwardtia tetragyna Linaceae Yellow Himalayan Flax
Reinwardtia indica Reinwardtia trigyna, Linum trigynum, Linum repens Linaceae Yellow Flax

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Species with description in Flora of China :  

Reinwardtia indica Dumortier [Bhutan, N India, Kashmir, Laos, Myanmar, Nepal, Pakistan, Thailand, Vietnam].


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Forest Plants of Eastern India By Amal Bhusan Chaudhuri (1993)-
Reinwardtia trigyna (Roxb.) Planch. is a synonym of Reinwardtia indica
Reinwardtia cicanoba

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Flowering Plants. Eudicots By Klaus Kubitzki (Description)-
Reinwardtia indica

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Reinwardtia (Linaceae) : 1 post by 1 author.

I have updated eFI (efloraofindia) page on Reinwardtia (Pl. click).

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other links.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

Any comments/ corrections are welcome.