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 northeast and intersects SR 5 (New Market Road). Laburnum Avenue parallels Cornelius Creek northeast, passing to the south of Varina High School. The highway curves northward beyond its intersection with Darbytown Road. Laburnum Avenue expands to six lanes, crosses over CSX's Peninsula Subdivision rail line, and intersects Charles City Road west of Richmond International Airport. Laburnum Avenue continues north with four lanes along the eastern edge of the unincorporated area of Montrose. The highway intersects US 60 (Williamsburg Road), starts veering northwestward, and temporarily expands to six lanes ahead of its five-ramp partial cloverleaf interchange with I-64. Laburnum Avenue has