Tree Collards - I need a latin name and formal description

Ferndale, WA(Zone 8a)

Tree Collards, aka Purple Tree Collards, aka Tree Kale?
Has anyone heard of them?
They grow tall, have a sturdy trunk-like stalk, withstand hot and freezing temperatures, and bear their nutritious crop throughout the winter.
I'm looking for a Latin name for them.

Augusta, GA(Zone 8a)

Brassica oleracea var.longata. Also known as Walking Stick Cabbage, Jersey Kale, Walking Stick kale.

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