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GLOSSARY 



Hydrangea and Euonymus in- 

 florescences. 



Receptacle. The tip of the 

 flower pedicel, to which are 

 attached all parts of the 

 flower. 



Recurved. Curved downward 

 or backward. 



Reflexed. Bent downward or 

 backward abruptly. Used in 

 this text especially to indi- 

 cate the position of the sepals 

 on rose fruits. 



Regular. Having all sepals, 

 and all petals, alike. 



Reniform. Kidney - shaped. 

 Used in this text to describe 

 leaf shape. 



Repand. Undulating. Used for 

 leaf margins that are not 

 sufficiently toothed to be 

 called crenate. 



Resinous-dotted. Covered with 

 small dots of resin. Used in 

 this text to describe leaf sur- 

 faces covered with small dots 

 of exuded resin. 



Reticulate. Forming a net- 

 work. Used especially to 

 describe leaf veining. 



Retrorse. Turned backward. 

 Especially descriptive of long 

 hairs and bristles. 



Revolute. Rolled backward or 

 under. Used in this text to 

 indicate that leaf margins are 

 rolled under. 



Rhombic. Having sides ob- 

 liquely parallel. Used espe- 

 cially for fruits when the axis 

 of the fruit is not a straight 

 extension of the pedicel. 



Rhomboidal. Having a rhom- 

 bic shape. 



Rotund. Rounded and swollen. 

 Used in characterizing fruit. 



Samara. A dry fruit with 

 wings. The maple seed is 

 a familiar samara. 



Scabrous. Covered with hairs 

 or rough projections, so that 



the surface feels rough to the 

 touch. Used in characterizing 

 the surfaces of leaves. 



Scale. One of the small, dry 

 flakes that form the outside 

 of a bud ; also a small flake 

 found on some stems and 

 leaves. 



Semicordate. Used for a leaf 

 base with a somewhat heart- 

 shaped attachment to the peti- 

 ole. 



Semilunate. Almost crescent- 

 shaped. Used to indicate 

 the shape of certain seeds. 



Sepal. The individual part of 

 a calyx. In most flowers, one 

 of the green parts. 



Septum. A partition. Used in 

 this text for the partition that 

 separates the carpels of a 

 compound pistil. 



Sericeous. Covered with very 

 fine, silky, usually shiny hair. 



Serrate. Bearing sharp teeth 

 that are directed forward. 

 Used to describe leaf mar- 

 gins. 



Serrulate. The same as ser- 

 rate, but the teeth very 

 small. 



Sessile. Without a stalk. Used 

 for leaves that are attached 

 directly to the stem, for leaf- 

 lets that are attached directly 

 to the rachis, and for very 

 short - stemmed flowers and 

 fruits. 



Shoulder. The large lateral 

 branch in the inflorescence 

 and fruit cluster of some 

 species of grapes. 



Simple. Not compound. Used 

 to indicate that leaf blades 

 are in one piece and that 

 pistils are not united with 

 one another. 



Sinus. The open space between 

 lobes in a leaf blade. 



Smooth. Smooth to the touch. 

 Lacking hairs or projections 



