Racemose. Resembling a raceme. 



Rachis. The central axis of a spike or raceme of flowers or of 



a compound leaf. 



Recurved. Curved downward or backward. 

 Reticulate. Netted. 



Rough. Harsh to the touch ; pubescent. 

 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 xm. 

 Serrate. Toothed, the teeth sharp and pointing forward. Page 



XIII. 



Sessile. Without a stalk. 



Shrub. A bus'hy, woody growth, usually branched at or near the 

 base, less than 15 feet in height. 



Simple. Of one piece; not compound. 



Sinuate. Strongly wavy. Page xm. 



Sinuous. In form like the path of a snake. 



Sinus. The cleft or space between two lobes. 



Smooth. Smooth to the touch; not pubescent. 



Spatulate. Wide and rounded at the apex, but gradually nar- 

 rowed downward. Page xn. 



Spike. A simple inflorescence of sessile flowers arranged on a 

 common, elongated axis (rachis). Page xiv. 



Spine. A sharp woody outgrowth from a stem. 



Spray. The aggregate of smaller branches and branchlets. 



Stamen. The pollen-bearing organ of a flower, normally con- 

 sisting of filament and anther. Page xm. 



Staminate. Provided with stamens, but usually without pistils. 

 238 



