This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This is the beautiful North American White Wood, easily recognized by its grey-brown bark, lobed leaves with the tips apparently cut off, and the soft yellow-green Tuliplike flowers at the tips of the shoots in May. There are a few varieties, like aureo-maculata, leaves blotched with yellow; integrifolia, entire leaved; and variegata. Grows in any good soil and is raised from seeds or layers.