Pogostemon menthoides Blume, Bijdr. Fl. Ned. Ind.: 825 (1826) (syn: Pogostemon fraternus Miq. ; Pogostemon macgregorii W.W.Sm.);
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E. Himalaya to China (S. Yunnan) and W. & Central Malesia: Assam, Borneo, China South-Central, East Himalaya, Jawa, Lesser Sunda Is., Myanmar, Philippines, Thailand, Vietnam as per POWO;
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Decumbent herb,60-90cm.Stems straggling,branched,pubescent above,glabrescent below,often dull purple.Leaves ovate to ovate-oblong,2-8.4 x 1.6-4.6cm,acute,base rounded,margins irregularly serrate,both surfaces sparsely pilose and with numerous sessile glands;petiole 0.8-4cm.Spikes 3.5-14 x 2cm;whorls distant or conferted.Pedicels 1-2.5mm,lower 2 slightly longer.Corolla mauve to violet,6.5-7mm;lobes ± oblong,1-2mm.Stamens exserted beyond corolla for 4mm.Nutlets subglobose,rounded trigonous,0.9 x 0.9mm.
Fl. March-April
Steep grassy bank in damp forest.
(Attributions: A.C.J Grierson & D.G Long. Flora of Bhutan. Published by RBGE and RGoB. 1999 as per Bhutan Biodiversity Portal)
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MS,March, 2023/03 Herb for id: 2 images.
Location : Ailawng, Mizoram
Habitat : Wild
Pogostemon benghalensis (Burm.f.) Kuntze !
Pl. post high res. images to check the details as per keys at MS, April,2022/12 Pogostemon sp. for id.
Keys from your book as available in the post (MS, April,2022/12 Pogostemon sp. for id.) lead me to Pogostemon fraternus Miq. (syn. of Pogostemon menthoides Blume).
It is correct as per FoC illustration and POWO specimen and GBIF.
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MS,March, 2023/07 Herb for id: 3 images.
Location : Ailawng, Mizoram
Habitat : Wild
Pogostemon benghalensis (Burm.
This appears to be same as in MS,March, 2023/03 Herb for id
Keys from your book as available in the post (MS, April,2022/12 Pogostemon sp. for id.) lead me to Pogostemon fraternus Miq. (syn. of Pogostemon menthoides Blume).
It is correct as per FoC illustration and POWO specimen
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MS, April, 2023/21 Herb for id: 3 images.
Location : Hmuifang, Mizoram
https://efloraofindia.com/2011/03/22/pogostemon/ !
I think close to images and details at
https://efloraofindia.com/2023/03/28/pogostemon-menthoides/
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References:
POWO specimen GBIF Catalogue of Life BSI Flora of India Flora of China FoC illustration India Biodiversity Portal Bhutan Biodiversity Portal Flora Malesiana