Synotis vagans

Synotis vagans (Wall. ex DC.) C.Jeffrey & Y.L.Chen, Kew Bull. 39(2): 288 (1984) (syn: Senecio vagans Wall.; Senecio vagans Wall. ex DC.; Solidago chinensis Spreng. ex DC. (ambiguous synonym));

India (C- to E-Himalaya), Nepal, Bhutan, Vietnam as per Catalogue of Life;
Synotis triligulata (Buch.-Ham. ex D.Don) C.Jeffrey & Y.L.Chen : 11 posts by 1 author. 10 images- 6 to 7 mb each.
Location: Godawari
Date: 8 January 2020
Elevation: 2065m.
Habitat: Wild
Syn: Senecio triligulatus Buch.-Ham. ex D.Don

It is not Synotis triligulata as per keys in MS March, 2020/02 Senecio sp. for ID from Reinstatement of the Sino-Himalayan species Senecio pentanthus (Asteraceae, Senecioneae) MING TANG, CHEN REN & QIN-ER YANG - Phytotaxa 292 (3): 253–261 (2017) 

Distribution to Nepal is not mentioned in any links except in the enclosed journal and corolla yellowish-white in this sp. whereas in my sp. it is purely dark yellow. As such, I could not decide.

I have crossed checked with ... also and he  has validated as Senecio triligulata i.e., Synotis triligulata.

As per keys in Reinstatement of the Sino-Himalayan species Senecio pentanthus (Asteraceae, Senecioneae) MING TANG, CHEN REN & QIN-ER YANG - Phytotaxa 292 (3): 253–261 (2017)Capitula minutely radiate in Synotis triligulata. But it is having quite big ray florets (Capitula radiate).
Unless it is new to Nepal!
How can you be so sure with so many species in Checklist of Nepal

I checked POWO, GBIF and CoL. They are not showing distribution in Nepal but only S.himalayas !

Keys from Flora of Bhutan at Synotis leads me to Senecio acuminata as per specimen in GBIF, FoC illustration Flora of China  Checklist of Nepal
Looks different from closer species Synotis tetrantha as per FoC illustration  GBIF  Checklist of Nepal

But Flora of China says Capitula minutely radiate, numerous, arranged in terminal compound corymbs; Ray floret 1; Disk florets 2 or 3;
So it is not Senecio acuminata also.

On further checking, it is seen that it should be Synotis vagans as per GBIF specimens as below:
For Synotis vagans, Flora of Bhutan says:
Similar to S. triligulata but glabrous; leaves narrowly ovate. 7- 12 >< 2.5- 4cm. rounded at base. denticulate: petioles up to 10mm: capitula in axillary corymbs; phyllaries 8. glabrous; ray flowers c 4-5. corolla tube 3mm; ligules 4 >< 1.5mm: disc flowers 5——6: pappus 7mm.
For Synotis triligulata (Buchanan-Hamilton ex D. Don) C. Jeffrey & Y. L. Chen, Flora of China says, petiole 1-2 cm, capitula minutely radiate, very numerous, arranged in lax axillary and terminal rounded compound corymbs; Ray florets 3 or 4; Disk florets 3 or 4;

I guess you are correct ...!

Some expert from China has validated as Synotis triligulata !
It looks close to both species suggested here. So need to measure and observe the specimen floral and other features to confirm.
As already discussed in detail in this thread, it should be Synotis vagans only as per details and references herein.
Synotis triligulata looks different as per images and references herein.