xvi Preface 



Spatulate Rounded at the end and gradually narrow- 

 ing at the base. 



Spike Sessile flowers on an elongated stem. 



Spur A nectar-bearing, hollow extension of some 

 portion of a blossom. 



Stamen One of the pollen-bearing organs. 



Standard The upper, dilated petal of a pea-like flow- 

 er. 



Stem The main ascending axis of a plant. 



Sterile Unproductive. 



Stigma That part of a pistil through which pollen 

 effects an entrance. 



Stipsule An appendage, or bract, at base of petiole. 



Style Connection between the stigma and ovary. 



Tuber A short, thick, underground root having num- 

 erous buds or eyes. 

 Tufted Growing in clumps or clusters. 



Umbel A flower cluster with pedicels all from a com- 

 mon center. 



Veins. Thread-like branching nerves. 

 Whorl Arrangement in a circle about stem. 



