Epithema ceylanicum Gardner, Calcutta J. Nat. Hist. 6: 492 (1846) (syn: Epithema dentatum (C.B.Clarke) Hilliard & B.L.Burtt; Epithema dentatum subsp. hispidum (C.B.Clarke) Hilliard & B.L.Burtt; Epithema taiwanense S.S.Ying; Epithema taiwanense var. fasciculatum (C.B.Clarke) Z.Yu Li & M.T.Kao);
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India to Taiwan and Philippines: Andaman Is., Cambodia, India, Myanmar, Philippines, Sri Lanka, Taiwan, Thailand, Vietnam as per POWO;
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236 ID wild plant Argostemma: 13 images.
Please ID wild plant,
Location: near Vannappuram Thodupuzha Idukki District Kerala 685607
Altitude: 1500fsl
Flower date: 13.12.2021, 04.05pm
Habitat: wild, moisture, shady, rock stone nearby stream facing waterfalls
Plant habit: erect, branches, weak fleshy stem 04mm base diameter, rooted on rock stone, hairy, annual
Height: 15cm
Leaves: opposite, heart shaped, apex, hairy, fleshy, serrated margins, size:15×8cm
Flower: racemose, clustered, diameter:02.5mm, white with violet, non fragrant
Fruit: cone shaped cup green into brown, diameter:05mm
Seed:
Camera: mobile Samsung Galaxy A21s


Are you sure it is Argostemma ??


I am not sure dear …, my suggestion is only based on my fruit image of A. quarantena at eFI,


Epithema carnosum


Yes, it is Epithema carnosum dear …, thank you very much for ID my plant


As per A revision of Epithema (Gesneriaceae)– January 2015 Gardens’ Bulletin Singapore 67(1):159-229- Kaylene Bransgrove and  David John Middleton:

Epithema carnosum is widespread across tropical Asia with the exception of Malesia. It is similar to some of the forms of Epithema ceylanicum and was originally separated from it (as E. dentatum) by E. carnosum having crenate-sinuate leaves vs. E. dentatum having small teeth on the leaf margin that are sometimes subacute or doubly serrate. Also Epithema dentatum was said to have shorter petioles on the upper leaves. These characters cannot consistently be used to separate Epithema carnosum from the now more broadly defined E. ceylanicum which includes E. dentatum. It is better separated from Epithema ceylanicum by the hairs on the ovary and operculum. They are straight in E. carnosum and hooked or primarily so in E. ceylanicum. In nearly all specimens from India, Nepal and Myanmar there is no variation in this character, but on specimens from China, Thailand and Vietnam a proportion of the hairs on the ovary/operculum of Epithema carnosum may be hooked. In all cases where the majority of the hairs are straight, the specimens are assigned to E. carnosum. This is also essentially true of Epithema ceylanicum where the hairs on almost all specimens from India and Myanmar have only hooked hairs on the ovary and operculum but some specimens from north and north-west Thailand also have some straight hairs on the ovary/ operculum. In all cases where the majority of the hairs are hooked, the specimens are assigned to E. ceylanicum.
Epithema carnosum occasionally produces peduncles from the petioles of the leaves of the terminal leaf pair. Peduncles arising from the midrib of these leaves has only been observed in specimens of Epithema carnosum from Khasia in Northeast.
Only distribution is given of E. ceylanicum in the posted area.
So I take it as E. ceylanicum.


 


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References: POWO  Catalogue of Life (Epithema zeylanicum Gardner) The Plant List Ver.1.1 (Epithema zeylanicum Gardner)  WCSP  IPNI  GBIF (High resolution specimens)
A revision of Epithema (Gesneriaceae)– January 2015 Gardens’ Bulletin Singapore 67(1):159-229- Kaylene Bransgrove and  David John Middleton

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