Rugose. Wrinkled.
Samara. An indehiscent winged fruit.
Sapwood. The living outer portion of a trunk or large branch of a tree between the heartwood and the bark.
Scales. Small modified leaves, usually thin and scarious, seen in buds and cones; the flakes into which the outer bark often divides.
Scaly. Provided with scales.
Scarious. Thin, dry, membranaceous; not green.
Scurfy. Covered with small bran-like scales.
Seed. The ripened ovule.
Sepal. One of the divisions of a calyx. Page [xiii.]
Serrate. Toothed, the teeth sharp and pointing forward. Page [xiii.]