Spiraea Reevesiana fl. plena. - Reeves's Double-flowering Spiraea. - The Spiraea family constitute an elegant ornamental class, and the single variety of Reevesii is one of the most elegant of the tribe, on account of the elegance of its foliage, gracefulness of its branches, and beauty of its snowy-white, clustered flowers; but this new double variety is an improvement upon it, and will make a magnificent show when grown to a large size. Its height is about four feet. At present (1856) the plants offered for sale are small, but it will grow rapidly into a large bush, if planted in a rich soil.