Robinia pseudoacacia cv.idaho, also known as Fu Guishu, is a deciduous tree of Butterfly Family, native to Spain, with a plant height of10-12m and a brown to grayish brown trunk. Leaves alternate, pinnately compound, with 7- 19 leaflets, ovoid to ovoid, 3-6 cm long, smooth, green, beautiful and symmetrical, dark green, shiny and green. Racemes, with red perianth and rich fragrance, can bloom 200-500 small red flowers at the same time, which is very spectacular and beautiful.

Robinia pseudoacacia, also known as Robinia pseudoacacia, Robinia pseudoacacia, is native to North America. Deciduous trees or shrubs (in the north), up to 2-4 m; Branches and pedicels densely covered with red bristles. Odd pinnate compound leaves, 7- 15 leaflets, nearly round or rectangular, 2-5 meters long. Racemes, with 3-7 flowers, corolla rose or lavender. Its stems, branchlets, pedicels and petioles all have red bristles, and its leaves are similar to Robinia pseudoacacia. Odd pinnate compound leaves alternate, broadly elliptic, obtuse at the apex and small at the tip. Butterfly corolla, pink or purplish red, with 2 to 7 flowers in sparse racemes, usually fruitless, flowering in May. Distribution: Beijing and Shanghai are cultivated, and Dalian, Xingcheng and Shenyang are also cultivated. Tianjin, Shaanxi Wugong, Nanjing, Liaoning Xiong Yue and other places have a small amount of introduction.

There are three kinds of fake locust tree seedlings on the market:

A. Robinia pseudoacacia replaced Robinia pseudoacacia. Robinia pseudoacacia and Robinia pseudoacacia's corolla are butterfly-shaped and purplish red. Robinia pseudoacacia blooms once a year, bears pods and is grafted with Robinia pseudoacacia as rootstock. Sophora japonica blooms twice a year, without pods, and propagates by root segments.

B. grafted seedlings of Sophora japonica. Taking branches of Sophora japonica as scions and Robinia pseudoacacia seedlings as rootstocks. This kind of seedlings can be directly used for engineering greening, but not for reproduction. For example, the roots of this seedling are all black locust seedlings.

C. dope Robinia pseudoacacia or Amorpha fruticosa seedlings. Robinia pseudoacacia seedlings have big and hard thorns, Amorpha fruticosa has no thorns, and Amorpha fruticosa has a small number of small thorns.

Identification method of seed roots: Many growers mix Robinia pseudoacacia and Amorpha fruticosa in seed roots. The seed roots of Amorpha fruticosa are slightly softer than those of Robinia pseudoacacia, with yellow skin and fewer nodules. The root epidermis of Amorpha fruticosa is smoother than that of Amorpha fruticosa, but the thinner roots are difficult to distinguish.