Usually I have several alternates for plant IDs, since the drawings are not expert, but for this one, it's difficult to find alternatives to
Equisetum.
It's not hard to find that scaly top. There are many plants with spathes that have flower spikes (spadixes) like this if you peel away the outer "petal". But finding one with this kind of flower-head combined with stem-whorl-leaves is a bit of a challenge.
There is one called
Amorphophallus arcuspadix that grows in Thailand with the right kind of spadex and leaves:
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But
Amorphophallus arcuspadix does not come in two varieties (nor do the other spathe-and-spadix plants). It doesn't have branched and unbranched fruiting spikes, whereas
Equisetum does have branched and unbranched forms similar to plant You are not allowed to view links.
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Login to view. . If the leaves of You are not allowed to view links.
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Equisetum is very much a stream and pond-loving plant. And if the leaves of 29r are meant to be horses' tails, then it fits the name of the plant.
In the fall, when the seedheads start to turn brown and seedy, Equisetum spikes sometimes droop.