Common laburnum or golden chain tree are the common English names . Caragana arborescens , or Siberian peashrub , is also in the Fabaceae family , but a different genus . Softer wood , but those colours and their apparent random patterning are very typical . By far , my favourite turning wood .I had never heard of Caragana. It looks a lot like Laburnum anagyroides. Sorry i do not know the normal name of that tree in english.
I grew up in Northern Montana. It's very dry there and gets very, very cold. The settlers needed something that could provide a wind break around the homesteads. Almost every house of there ha at least one row of caraganas as a wind row. It's my understanding that they needed something that could withstand 35 below 0 (F) AND survive in near desert conditions. Enter siberian pea shrub. They brought it over from Siberia. This was a story passed down from my dad. I do know that the government provided caragana and ash saplings for us to plant as wind rows in our grain fields. The idea was to try and make a wind break that would catch snow so it wouldn't blow into North Dakota. Trying to do anything possible to retain moisture in the fields for the crops.Very neat looking wood. I will have to look it up and see where it grows.