Flora of Chakrata Part-2: Equisetum from tiger fall Chakrata

[Balkar Singh]

Dear All

Equisetum from tiger fall Chakrata

Thanks

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Regards

Dr Balkar Singh
Head, Deptt. of Botany and Biotechnology
Arya P G College, Panipat
Haryana-132103
09416262964

[JM Garg]

[J.M. Garg]

I feel it appears close to images at Equisetum arvense L.   

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With regards,
J.M.Garg

[J.M. Garg]

Thanks a lot, Chris ji

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With regards,
J. M. Garg

---------- Forwarded message ---------
From: Chris Fraser-Jenkins <>
Date: Sun, 2 Apr, 2023, 21:20
Subject: Re: [efloraofindia:445053] Fwd: Flora of Chakrata Part-2: Equisetum from tiger fall Chakrata
To: J.M. Garg <jmg...@gmail.com>

Well it's only close to E. arvense in that this species is related to E. arvense.  But this is the well known E. diffusum, distinguished from E. arvense by having monophyadic stems, i.e. fertile stems are green (with chlorophyll) and develop branches.  E. arvense has two types of stem (diphyadic), the early season fertile ones, being brown, without chlorophyll or branches and with short stems and wide, loose sheaths on them.  After that the completely sterile green trophic stems appear and have whorls of branches.

I think E. arvense is a development from E. diffusum in adaptation to cold northern climates (it also occurs up very high in the West Himalaya).  E. diffusum occurs throughout the temperate Himalaya at medium altitudes.

I have actually treated E. arvense as a subspecies of E. arvense, and prefer to keep them at subspecific rank. 

Best wishes,

    Chris Fraser Jenkins.