Is Beema Bamboo a Solid Bamboo?

I'm wondering about how true the claims of total solidity of some species or varieties of bamboo actually are. e.g. Bambusa balcooa var 'Beema'. Is it a case of mostly solid starting from the base up or total solidity? Or is it just an occasional occurrence even in monoclonal cultivars?

I know this site refers to Guadua angustifolia but it is also one of the best bamboo resources I've found online in terms of plain presentation of facts rather than the standard sales pitch so I figured where better to ask.

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⭐ Best Answer:

100% solid bamboo (the entire culm) doesn't exist as far as I know, except maybe for some small diameter bamboo in the genus Chusquea.

In the genus Guadua there also exist a near solid species called Guadua amplexifolia (see photo), which starts nearly solid at the base, however a small cavity the size of a pencil is still present. Towards the middle and top of the culm the bamboo becomes hollow again, although the wall thickness remains fairly thick.

Guadua amplexifolia