Which tree is known for its distinctive golden foliage and is considered a locust?

The tree renowned for its distinctive golden foliage and classified as a locust is indeed Robinia pseudoacacia 'Frisia'. This cultivar of the black locust is well-known for its vibrant golden-yellow leaves, which stand out particularly in spring and during autumn. The foliage of 'Frisia' tends to maintain its bright color throughout the growing season, making it a popular choice for landscape designers looking to add visual interest to gardens and parks.

In addition to its striking appearance, Robinia pseudoacacia 'Frisia' is valued for its hardiness and adaptability to different soil types, along with its ability to tolerate drought conditions once established. This tree’s form and leaf color serve to enhance outdoor spaces, providing a beautiful contrast to darker greens typically found in many landscape settings.

The other choices represent different species or modifications that do not share the same characteristics associated with the locust or golden foliage. Therefore, recognizing Robinia pseudoacacia 'Frisia' among them highlights its unique attributes.