Goniothalamus simonsii Hook. f. & Thomson, Fl. Ind. 1: 108 1855. ;
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Arunachal Pradesh? , Assam? , Meghalaya as per India Biodiversity Portal;
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Shrub or small tree about 2-3 m tall, young parts brown pubescent. Leaves simple, alternate, narrow obovate-elliptic to oblong-elliptic, 24-40 x 7-14 cm across, base acute or rounded, margin entire, apex caudate or acuminate, coriaceous, dark green, glabrous above, paler glaucous except on brown pubescent on the midrib and veins beneath, lateral veins 15-20 on either side of the midrib, almost straight, anastomosing near the margins, to form a continuous wavy intramarginal veins, impressed above, slightly prominent on the veins and midrib beneath, reticulate rather strong but nearly open, petiole canaliculated, brown pubescent, about 1-1.5 cm long. Flowers bisexual, usually solitary, axillary, slightly drooping, creamy white, about 1.5-2 cm across, pedicels pubescent, about 1 cm long, bracts basal, few, Sepals 3, broadly ovate, somewhat triangular, base united, apex acute, veins prominent, persistant, pubescent, about 8-15 x 7-10 mm across. Petals 6 in 2 series, subequal, outer petals, oblong-lanceolate, slightly clawed at the base, apex acuminate, distinct midrib, thick, creamy white, pubescent both outside and inside, about 3-4 x 1-1.5 cm across, inner petals shorter and smaller, somewhat triangular or forming a triquetrous cone, connate on top, brown pubescent outside. Stamens many, linear oblong, closely packed, about 3 mm long, anthers distant, dorsally fixed, connectives pubescent, acute on the top. Carpels many, linear oblong, pubescent, about 3 mm long, style cylindrical, stigma bifid. Ripe carpels, many, oblong, apex mucronate, about 1.5 cm long, on a much elongated torus.
Riparian evergreen forests in shady places near streams, altitude of about 500-900 ft.
Local Distribution: Arunachal Pradesh? , Assam? , Meghalaya. Global Distribution: Asia: India.
(Attributions- Ganeshaiah, K. N., UAS, Bangalore, India. Kailash, B. R., UAS & ATREE, Bangalore, India. Indian Bioreso… as per India Biodiversity Portal)
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Images by Ritesh Kumar Choudhary (Id help by L. Rasingam & Navendu Page) (Inserted by J.M.Garg)    
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Id26062010RKC1 : 11 posts by 5 authors. Attachments (5).
Pl. check in Desmos and Goniothalamus
Pl try in Fissistigma polyanthum ( Hook f & Thomson) Merr.
else near to it in Fissistigma genus
Many thanks for digging deep into the ID of this plant. I’ll go as per your suggestion.
I think its more likely to be a species of Goniothalamus. I don’t have access to north eastern floras but I will check it out and let you know.
Only 2 sp., Goniothalamus sesquipedalis (Colebr. ex Wall.) Hook.f. & Thomson
and Goniothalamus simonsii Hook. f. & Thomson are listed in Arunachal Pradesh ??
Thanks, …, for listing two species in Arunachal.
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References: POWO Catalogue of Life The Plant List Ver.1.1 WCSP IPNI GBIF– specimen (High resolution specimens) India Biodiversity Portal IBIS Flora (FBI) Wikipedia Plant illustrations