Checked my own database on Latin species names and can find very little and no direct references.
In Great Britain and Ireland, the standard name is broom. This name is also used for other members of the Genisteae tribe
https://en.wikipedia.org/wiki/Genisteae
"Genisteae is a tribe of trees, shrubs and herbaceous plants in the subfamily Faboideae of the family Fabaceae. It includes a number of well-known plants including broom, lupine (lupin), gorse and laburnum."
So laburnum is the only one of a type of timber we can recognize, so it possibly shares properties with that. The few references I can find list it as a super hard timber used for charcoal and also arrow heads.
Laburnum is also a high density timber
Most other references place it as a kind of scrub type shrub. It's not tall, listing at maybe 6' max.
I've also seen a reference of laburnum in bowmaking, but that specifies sapwood, and maybe this Broom isnt capable of producing any distinction, might be too thin.
What is it you are thinking of using it for ?