Begonia cathcartii

Begonia cathcartii Hook.f. & Thomson, Ill. Himal. Pl. t. 13 1855. (syn: Begonia nemophila Kurz; Platycentrum cathcartii (Hook.f. & Thomson) Klotzsch);
Bangladesh; East Himalaya; Myanmar; Thailand as per Catalogue of Life;

Common name: Red-Hair Begonia

Rootstocks rhizomatous. Stems up to 30cm, when young bearing coarse deflexed hairs with broad bases(leaving white lenticular scars where these have fallen). Leaves ovate, 6-10×3.5-6cm, acuminate, base obliquely cordate, margin serrate-dentate, ciliate, pubescent above, glabrous or with a few coarse hairs along veins beneath; petioles 3-10cm, bearing coarse, deflexed hairs. Outer perianth segments suborbicular, 1.5-2.5×1.5-2.5cm,white,often with reddish,coarse hairs outside;inner segments obovate,1-1.5×1-1.5cm. Stamens numerous, forming a globose mass c 8mm diameter. Style branches convolute; ovary ± densely hairy. Capsule c 10x4mm, with one large wing c 1cm, ± ascending, rounded toward base, and 2 smaller wings c 5mm.

Fl. May-August
Dense Subtropical jungle
(attributions- A.J.C. Grierson & D.G. Long. Flora of Bhutan. Published by RBGE. 1991 from Bhutan Biodiversity Portal)

Begonia cathcartii Hook.f. & Thomson?? : 3 posts by 2 authors. Attachments (7)

Location : Lava, Kalimpong, India
Date : 11 May 2018
Elevation :  7000 ft.
Habit : Wild

Yes, correct! 

Begonia cathcartii Hook.f. & Thomson : 3 posts by 2 authors. Attachments (8)- around 800 kb each.

Location : Sukhiapokahari, Darjeeling, India
Date : 12 May 2018
Elevation :  6900 ft.
Habit : Wild

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Begonia identity 2 : 4 posts by 2 authors. Attachments (1) – 685 kb

please help to identify the Begonia species attached.
Collected from Arunachal Pradesh

Attachments (1) – 7 mb 

A young specimen of B. cathcartii