GLOSSARY OF BOTANICAL TERMS 



PERSISTENT. Long continuous, applied to leaves that remain on the tree 



over winter and to a calyx that remains until the fruit ripens. 

 PETAL. One of the leaves of the corolla. 

 PETIOLE. The stem of a leaf. 

 PINNA (pi. pinnae). One of the primary divisions of a pinnately compound 



leaf. 

 PINNATE. Applied to compound leaves where the leaflets are arranged on 



each side of a common petiole. 



PISTIL. The modified leaf or leaves which bear the ovules ; usually con- 

 sisting of ovary, style and stigma. 



PISTILLATE. Applied to flowers that possess pistils but not stamens. 

 PLICATE! Folded like a fan. 

 PLUMULE. The primary bud of the embryo. 

 POLLEN. The fertilizing powder produced by the anther. 

 POLYGAMOUS. Applied to plants which produce staminate, pistillate, and 



perfect flowers all on the same plant. 

 PROTOPLASM. The living matter of the cell. 

 PUBESCENT. Downy, covered with soft hairs. 

 RACEME. A simple inflorescence of pedicelled flowers upon a common, more 



or less, elongated axis. 

 RACHIS. The axis of inflorescence. 

 RADICLE. The primary root of the embryo. 



RECEPTACLE. The shortened stem on which the floral organs are inserted. 

 REDUPLICATE. Doubled back. 

 REFLEXED. Bent outward. 



REPAND. Leaf margin toothed like the margin of an umbrella. 

 REVOLUTE. Rolled backward. 

 ROTATE. Flat circular disk; applied to corollas. 



SAMARA. An indehiscent dry fruit provided with a wing-like appendage. 

 SECUND. Flowers arranged along one side of a lengthened axis. 

 SEPAL. One of the leaves of the outer whorl of floral organs. 

 SERRATE. Toothed, with sharp teeth projecting forward. 

 SINUATE. Wavy. 



SINUS. The cleft between two lobes. 

 SPATULATE. Resembling a spatula in outline. 

 SPIKE. A form of simple inflorescence in which the flowers are sessile or 



nearly so, borne upon a lengthened axis. The lower flowers bloom 



first. 



SPRAY. The ultimate division of a branch. 

 STAMEN. The pollen-bearing organ of the flower, usually consisting of 



filament and anther. 



STAMINATE. Applied to flowers which have stamens but not pistils. 

 STERIGMA. PI. Sterigmata. The woody base upon which the leaves of 



many of the evergreens are borne. 

 STIGMA. That part of the pistil which receives the pollen. 



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