Biochemistry - What is form and content of silicon in horsetail and proso millet?

In what form does silicon occur in:*** field horsetail (Equisetum arvense L.), and *** proso millet - Panicum miliaceum L., (disturbed grain, devoi

In what form does silicon occur in:
*** field horsetail (Equisetum arvense L.), and
*** proso millet - Panicum miliaceum L., (disturbed grain, devoid of scales)?
What is exactly its chemical name and formula?
And what is its weight content in dry mass, calculated as pure silicon ions.
I find conflicting information: They contain "silicon dioxide (SiO2)", or overall term "silicon", "silica", sometimes "silicon acid", or "orthosilicic acid". What is the true?

or:In what form does silicon occur in:*** field horsetail (Equisetum arvense L.), and *** proso millet - Panicum miliaceum L., (disturbed grain, devoid of scales)?What is exactly its chemical name and formula?And what is its weight content in dry mass, calculated as pure silicon ions.I find conflicting information: They contain \"silicon dioxide (SiO2)\

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