Swertia nervosa

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  • Swertia
Swertia nervosa (Wall. ex G. Don) C. B. Cl., Fl. Brit. India 4(10): 125 1883. (syn: Agathotes nervosa Wall. ex G. Don; Ophelia nervosa (Wall. ex G. Don) Griseb.; Swertia cavaleriei H. Lév.; Swertia nervosa Wall. (ambiguous synonym));
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Bhutan, Darjeeling, Sikkim, India, Nepal, China (SE-Gansu, Guangxi, Guizhou, SW-Shaanxi, Sichuan, Yunnan), Tibet as per Catalogue of Life;

Keys as per eFI thread:
Flowers are nearly similar in Swertia alata and Swertia nervosa. Basic difference is leaf sessile and base cordate in S. alata and leaf petiolate and base cuneate in S. nervosa, apart from other micro morphological characteristics.
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Location: Chalnakhel, Nepal
Altitude:  5000 ft.
Date: 12 November 2016 
Swertia nervosa (Wall. ex G. Don) C. B. Cl. (accepted name)
Nepali Names: कालो चिराइतो Kaalo Chiraaito / औलो घाँस Aulo Ghaas / तिते Tite

Thanks, … Appears close as per images at

This is Swertia nervosa as per keys and discussions at Swertia nervosa (Wall. ex G.Don) C.B.Clarke

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Swertia nervosa (Wall. ex G. Don) C. B. Cl.: 6 very high res. images.
Location: Okharpauwa, Nuwakot, Nepal
Altitude: 1711m.
Date: 13 October 2022
Habit : Wild

Nepali Name : कालो चिराइतो Kaalo Chiraaito 

I think it is more close to images at
https://efloraofindia.com/2020/10/09/swertia-alata/

Elevation does not match.
https://groups.google.com/g/indiantreepix/6AwAJ

To me the stem appears winged. Also flowers are more closer to S.alata.
Elevation is not much different as per
http://www.efloras.org/florataxon.aspx?flora_id=110&taxon_id=242350842

OK

Swertia nervosa (petiolate, cuneate leaves) as per keys and discussions at Swertia nervosa (Wall. ex G.Don) C.B.Clarke

OK

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Swertia nervosa (Wall. ex G.Don) C.B.Clarke:
Location: Godam, Chandragiri, Kathmandu, Nepal
Altitude : 1612m.
Date: 31 October 2023
Habit : Wild

Nepali Names : तिते चिराइतो Tite Chiraaito / कालो चिराइतो Kaalo Chiraaito

How is it different from
https://efloraofindia.com/2020/10/09/swertia-alata/?

I guess there is a slight difference in the floral pattern/ design !

Can you find out the keys as both the species are distributed in your area and Bhutan and NE India as per POWO:
https://powo.science.kew.org/names:370998-1
https://powo.science.kew.org/names:370786-1

This is Swertia nervosa only as per my knowledge.

May I request you to provide the differences between these two species (and keys).

Sir flowers are nearly similar in Swertia alata and Swertia nervosa. Basic difference is leaf sessile and base cordate in S. alata and leaf petiolate and base cuneate in S. nervosa, apart from other micro morphological characteristics.

Do you consider the posted lower leaves as petiolate with cuneate base?