Laburnum the Pacific Northwest and Northern Europe. "Laburnum" trees are ubiquitous in England, Wales, Scotland and Ireland, where they are commonly planted as lawn specimens or in shrub borders. Most garden specimens are of the hybrid between the two species, "Laburnum" ×"watereri" 'Vossii' (Voss's laburnum), which combines the longer racemes of "L. alpinum" with the denser flowers of "L. anagyroides"; it also has the benefit of low seed production. It has gained the Royal Horticultural Society's Award of Garden Merit. Laburnum Laburnum, sometimes called golden chain or golden rain, is a genus of two species of small trees in the subfamily
Slice genus of "K" is 1 while the genus and the smooth slice genus of "K" both equal g. The (smooth) slice genus of a knot "K" is bounded below by a quantity involving the Thurston–Bennequin invariant of "K": The (smooth) slice genus is zero if and only if the knot is concordant to the unknot. Slice genus In mathematics, the slice genus of a smooth knot "K" in "S" (sometimes called its Murasugi genus or 4-ball genus) is the least integer g such that "K" is the boundary of a connected, orientable 2-manifold "S" of genus "g" properly embedded in the