Another sort of marriage of science and art is celebrated in THE PLANT KINGDOMS OF CHARLES JONES (Thames & Hudson, $24.95), By Sean Sexton And Robert Flynn Johnson. Jones (1866-1959) was an estate gardener, at least in the earlier half of his life; not much is known about his later years. In 1981, Sean Sexton came upon a trunk at the Bermondsey flea market in London that contained hundreds of photos of vegetables, fruits and flowers, all of them titled and initialed by Jones, some of them signed.