Arisaema griffithii

Identification of Arisaema – regarding. (mixed thread) : 2 correct Attachments. 3 posts by 3 authors.
Let me introduce myself. I am a nature photographer from West Bengal ( India). During my visit to Sikkim and Singalila Forest (mainly through Darjeeling District of West Bengal) I had photographed some different Cobra Lilies (Arisaema) which I failed to identify.
Now, I am sending the photographs for your valuable comments.
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Photographs : 3A & 3B : Photographed in Singalila Forest (near Gairibas). Could not found in full blooming condition. Altitude : 9,000 ft. Blooming Time – April. Are they Arisaema griffithii ? Kindly confirm.
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That is indeed the correct ID. 
Arisaema griffithii is a variable species and particularly in the Yumthang valley many brown forms grow side by side with the more typical griffithii. Travelling further up the valley beyond the hot spring towards Yumesodong & zero point the plants get smaller, the spathes get more narrow and the appendices thicker and more contracted until they morph into forms close to Arisaema elephas. 
The purple-brown forms of griffithii are sometimes identified as Arisaema utile (of cultivation) but that is incorrect, in my view that name is a full synonym of griffithii. The holotype of utile was collected from near Lachen and is a different form of griffithii with a longer peduncle.

To me also appears closer to images at Arisaema griffithii Schott 

Habit : Wild

Nepali Name : ढोकायो साग Dhkaayo Saag

Also appears close to images at
https://efloraofindia.com/2011/02/07/arisaema-propinquum/

Yes …! Both look similar but the only difference is the patches on the stem(Stalk).

There is often confusion between propinquum and griffithii. Are the narrow forms of griffthii perhaps propinquum or not etc… The stem markings are of less concern in this discussion however. Looking at the description of propinquum and the plants still growing at the type locality the ones closest to propinquum have a narrow spathe, often flower before the leaves are fully unfurled and have a short appendix like this:

My personal view is that most of the narrower forms of griffithii still fall in the griffithii complex and are not true propinquum.  The one … is showing I would call griffithii. Which means the “typical” griffithii we see as this species is just the broad variant within the wide variation of the group. I have studied large groups of this complex in Nepal and Sikkim and quite often the variation in peduncle length, width of the spathe, length of the appendix and even color and pattern is quite large. Anyone familiar with the populations in N Sikkim around Lachung have seen that the higher into the valley one goes, the smaller the plants get and the narrower the spathes. I am aware it is a highly personal solution to the wide variation in this group that does conflict with some of the literature, but it is impossible in my view to artifically limit the names based on the width of the spathe or any other character that varies within populations. Instead I prefer to limit the name propinquum to a specific character combination in the form I just show and all other forms in the variation of what I artificially call the griffithii complex. In my view there are only 2 other nodes in the variation that can be identified by a specific set of characters: the rare vexillatum and ostiolatum (Shingallila Rodge).

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References:

The Plant List  GRIN   Annonated checklist of Flowering plants of Nepal  Flowers of India  Paghat’s Garden: Arisaema griffithii