102 Bulletin of the University of Texas 



Scale. A minute leaf. 



Sepal. One of the parts of the calyx. 



Serrate. With teeth like a saw. 



Sessile. Without a stalk. 



Sheath. A tubular or enrolled part or organ. 



Simple. Of one part. 



Sinus. The opening between the lobes of a leaf. 



Spatulate. Spoon shaped. 



Species. A group of individuals which are more like each other than 



they are like any other group. 



Spike. An elongated axis which bears sessile flowers. 

 Spine. A sharp woody outgrowth from the stem. 

 Stamen. The organ of the flower which bears the pollen. 

 Staminate. With stamens but without pistils. 

 Stigma. The tip of the' pistil. 



Stipules. A pair of leaf like organs at the insertion of the petiole. , 

 Stomate. A breathing pore in the leaf. 

 Style. The filamentous portion of the pistil. 

 Teeth. Projections from the leaf margin. 

 Thorn. A reduced, sharp pointed branch. 

 Tomentiim. A dense layer" of hairs. 

 Trifoliate. With three leaves. 

 Truncate. Cut off squar;ly. 

 Umbel. A flower cluster in which all the pedicels arise from the same 



point. 

 Whorl. A group Of three or more leaves or branches radiating from the 



point of attachment. 



