This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
(in allusion to the similarity of this plant to Chamsebatia). Rosaceae. Shrub grown for its handsome white flowers and the finely divided foliage; allied to the spireas.
Deciduous, with glandular aromatic pubescence: leaves alternate, bipinnate, with numerous minute segments; stipules lanceolate, entire: flowers in terminal panicles; calyx turbinate, with 5 erect lobes; petals 5, suborbicu-lar; stamens about 60: carpels 5, connate along the ventral suture, at maturity dehiscent into 2 valves: seeds few, terete, with a simple testa. - One species in W. N. Amer. Very similar in general appearance to Chamsebatia, but easily distinguished by the bipinnate leaves and the large dense panicles, and very different in its floral structure. An upright aromatic shrub with finely cut foliage and white flowers in large terminal panicles; one of the first shrubs to burst into leaf. It is hardy as far north as Mass., but, like other plants from the same region, it dislikes an excess of moisture, particularly during the winter, and is likely to be killed by it. It prefers' a sunny position and a well-drained soil, and likes limestone, but grows nearly as well without; it is not a plant for dense shrubberies.
Propagated by cuttings of half-ripened wood taken with a heel in August with slight bottom heat; usually by seeds sown in spring, and treated like those of spirea.
Millefolium, Maxim. (Spirsea Millefolium, Torr. Sorbaria Millefolium, Focke). Shrub, to 3 ft., glandular-pubescent: leaves bipinnate, short-stalked, ovate-oblong to linear-oblong in outline, 2-3 in. long, primary segments linear, deeply pinnatifid, with closely set obtuse lobes about a line long: flowers white, 1/2-2/3in. across, short-pedicelled, in terminal panicles 3-6 in. long: carpels hairy. Calif, to Wyo. and Ariz. B.M. 7810. G.C. III. 22:237; 40:183. Gn. 75, p. 459. G.F. 2:509. R.H. 1900, p. 515. M.D. 1905:198. M.D.G. 1908:208. Alfred Rehder.