Grafting growth in the vascular cambium. Occasionally, a so-called "graft hybrid" or more accurately graft chimera can occur where the tissues of the stock continue to grow within the scion. Such a plant can produce flowers and foliage typical of both plants as well as shoots intermediate between the two. The best-known example this is probably +"Laburnocytisus" 'Adamii', a graft hybrid between "Laburnum" and "Cytisus", which originated in a nursery near Paris, France in 1825. This small tree bears yellow flowers typical of "Laburnum anagyroides", purple flowers typical of "Cytisus purpureus" and curious coppery-pink flowers that show characteristics of both "parents".
Laburnum Avenue This intersection serves as the northern terminus of SR 197, which follows Laburnum Avenue westward. Laburnum Avenue passes along the northern edge of the Laburnum Park Historic District between Brook Road and SR 161 (Hermitage Avenue); the intersection with SR 161 features a statue of Confederate General A.P. Hill. The boulevard issues a ramp to westbound I-64 before it passes under I-64 and I-95 (Richmond Petersburg Turnpike) south of the complex interchange of those Interstates with I-195 south of Bryan Park. SR 197 splits south onto Saunders Avenue between the mainline Interstates and I-195, with which Laburnum Avenue has a