laburnum
noun
la·bur·num lə-ˈbər-nəm 
: any of a small genus (Laburnum, especially L. anagyroides) of poisonous leguminous shrubs and trees of Eurasia with pendulous racemes of bright yellow flowers
Example Sentences
Recent Examples on the Web But next winter, when temperatures cool again, the second phase of the restoration will include planting flowering trees like the white fringetree and laburnum; bulbs, including tulips; and perennials. 
Kathleen Beckett, New York Times, 6 Apr. 2020 For instance, Cassia fistula or the Indian laburnum, a native tree that paints many cities yellow at the onset of summer, is pollinated by several species of carpenter bees. Kartik Chandramouli, Quartz India, 2 Mar. 2020
Kathleen Beckett, New York Times, 6 Apr. 2020 For instance, Cassia fistula or the Indian laburnum, a native tree that paints many cities yellow at the onset of summer, is pollinated by several species of carpenter bees. Kartik Chandramouli, Quartz India, 2 Mar. 2020 Word History
Etymology
New Latin, from Latin
First Known Use
1567, in the meaning defined above