Abstract
1. A comparative study of the stem anatomy of ten species, dominant in the chaparral formation of southern California, is presented. 2. The pith is lignified and generally of small diameter, containing abundant starch grains and small amounts of other ergastic substances. 3. The wood is predominantly diffuse porous, and the annual rings, when present, are narrow, rarely exceeding 1 mm. in width. 4. Reserve food is abundant in the xylem, chiefly in the form of starch. 5. Pitted vessels are numerous, mostly with spiral or reticulate thickenings on their lateral walls. 6. With the exception of the members of the Rosaceae, the presence of mucilaginous fibers in the xylem is a common feature of all the plants studied. In Quercus dumosa mucilaginous fibers are found in the phloem as well. 7. Tannin is present in the phloem and cortex of Quercus and Rhus, and glucoside-like substances in the other genera.
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