GLOSSARY 



Ray flower. The flower in a head of Compositae which has a strap- 

 shaped or quill-shaped corolla. 



Receptacle. The region which bears the various organs of the 

 flower. 



Receptacle of head. The region which bears the flowers of a head 

 of Compositae. 



Receptacle tube. A tube formed by the growth of a part of the 

 receptacle around the ovary and which may or may not be 

 adnate to it. 



Recurved. Curved outward or backward. 



Reduced. Much smaller than ordinary. 



Reflexed. Abruptly bent or turned outward or backward. 



Regular flower. One in which two or more planes may be cut giv- 

 ing two equal halves; one in which no one petal is different 

 from all of the others. 



Resin-dotted. More or less covered with resin dots. 



Revolute. Rolled back from the margin. 



Rhizome. An underground stem of more or less uniform thickness. 



Rhombic. Shaped more or less like the geometric figure; an equi- 

 lateral oblique-angled figure. 



Rib. A prominent ridge or vein. 



Rootstock. Same as rhizome, which see. 



Rosette. A cluster of leaves having a circular arrangement. 



Rostellum. A small projection from the column in orchids. 



Rounded. More or less circular. 



Rusty. The color of iron rust, brownish-red. 



Saline. Where salt water is found. 



Salt-marsh. A wet, marshy place where salt water may be found. 



Salver-form. Having a slender tube with an abruptly spreading 



border. 

 Samara. An indehiscent fruit with a flat, membraneous attachment 



or wing, as in the maples, ashes, etc. 

 Sap. The liquid or juice in plant tissue. 

 Saprophyte. A plant which lives upon dead animal or vegetable 



matter. 

 Scale. A small, thin structure often similar to a small leaf but 



usually not green. 

 Scale-like. Similar to a scale. 

 Scape. A leafless stalk which arises from the ground and bears 



flowers. 

 Scar. The mark left by the separation of a leaf or other organ 



from the stem. 



Scurfy. More or less covered with small scales. 

 Seed. A structure containing a rudimentary plant. 

 Segment. A division or part of a deeply lobed or divided leaf. 



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