176 TREES OF NEW ENGLAND. 



Perfect. Having both pistils and stamens. 



Perianth. The floral envelope consisting of calyx, corolla, or both 



Persistent. Not falling for a long time. 



Petal. A division of the corolla. 



Petiole. The stalk of a leaf. 



Petiolule. The stalk of a leaflet in a compound leaf. 



Pistil. The seed-bearing organ of the flower. 



Pistillate. Provided with pistils ; usually applied to flowers without 



stamens. 



Pollen. The fertilizing grains contained in the anthers. 

 Puberulent. Minutely pubescent. 

 Pubescent. Covered with short soft or downy hairs. 

 Raceme. A simple cluster of pediceled flow r ers upon a common axis. 

 Rachis. The main axis of a compound leaf of a raceme or of a spike. 

 Ramification. Branching. 



Range. The geographical extent and limits of a species. 

 Reflexed. Turned backward. 

 Reticulated. Netted ; in the form of a network. 

 Revolute. Rolled backward from the margin or apex. 

 Samara. Key fruit ; winged fruit, like that of the ash or maple. 

 Scarf-bark. The thin, outermost layer which often peels off . 

 Segment. One of the divisions into which a plane organ, such as a 



leaf, may be divided. 

 Sepal. A calyx leaf. 

 Serrate. With teeth inclining forward. 

 Serrulate. With small teeth inclining forward. 

 Sessile. Not stalked, as when the leaf blade or flower rests directly 



upon the twig. 

 Simple leaf. Not compound, having one blade not jointed with 



its stem. 



Sinuate. Strongly wavy-margined. 

 Sinus. Interval between two lobes or divisions of a leaf ; sometimes 



sharp-angular, sometimes rounded. 



Spatulate. Gradually narrowed downward from a rounded summit. 

 Spike. A cluster of sessile or nearly sessile lateral flowers on an 



elongated axis. 

 Spray. The smaller branches and ultimate branchlets of a tree 



taken as a whole. 



Stamens. The pollen-bearing organs of a flower, each stamen consist- 

 ing of a filament (stem) and anther which contains the pollen. 

 Staminate. Having stamens. 



