Iris Cohen schreef
However, the last time I was in the Royal Botanical Garden in Hamilton,
which is on the way to Toronto, they had one. They even had an olive tree.

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Yes, olive trees are trees.

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As I mentioned before, the reason Welwitschia doesn't look like a tree is
that much of its trunk is underground.

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That might sound better if it actually had a trunk

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It is a member of the order Gnetales, which may be changed to a
subdivision.

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Gnetales by definition is an order (ending -ales).
The rank of a taxon with only three genera does not seem a very interesting
topic.

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It is related to Gnetum & Ephedra. They are peculiar plants somewhere
between the angiosperms and gymnosperms, but closer to the conifers.

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No. Welwitschia, Ephedra and Gnetum are Gymnosperms. Have been just about
forever. Conifers are another group of Gymnosperms.
PvR