FLOEA OF THE DISTRICT OF COLUMBIA. 303 



Receptacle. The somewhat enlarged end of the flower stalk upon which numerous 

 flowers or the organs of a flower are borno. 



Recurved. Curved downward or backward. 



Reflexed. Bent back or down abruptly. 



Regular. Having members of the same kind alike in shape, size, or structure. 



Renifonn. Kidney-shaped. 



Repand. Referring to an uneven, somewhat sinuate margin, or to leaf blades that are 

 wavy or "fluted" toward the margin. 



Reticulate. Net-veined; like a network. 



Retrorse. Directed back or downward. 



Retuse. With a shallow notch at the end. 



Revolute. Rolled backward from the margin or apex upon the lower surface. 



Rhachilla. See rachilla. 



Rhizome. Same as rootstock. 



Rib. A main or prominent leaf vein; a raised line or ridge ou fruit or other organs. 



Root. The underground part of the plant which supports it and provides it with 

 nourishment from the soil. 



Rootstock. A piostrate or subterranean stem, usually emitting roots at the nodes. 



Rostrate. Having a stiff beaklike tip. 



Rotate. Wheel-shaped, referring to a corolla or calyx which has the spreading limb 

 flattish and circular in outline. 



Rotund. Roundish; nearly orbicular. 



Rugose. With wrinkled surface. 



Runner. A slender stolon. 



Sac. A pouch, especially the cavity of an anther. 



Saccate. Pouchlike; provided with a pouch or sac. 



Sagittate. Shaped like an arrowhead, with the acutish basal lobes directed down- 

 ward. 



Salient. Directed outward (referring to marginal teeth). 



Salverform. Salver-shaped , referring to corollas having the slender tube very abruptly 

 expanded into a flat limb. 



Samara. An indehiscent winged fi'uit. 



Saprophyte. A plant which grows on dead organic matter. 



Scabrous. Rough to the touch. 



Scale. A reduced leaf at the base or beginning of a shoot; in sedges, the bract sub- 

 tending the flower; in Asteraceae, etc., the bracts on the receptacle at the side 

 of (below) each flower. 



Scape. A leafless or nearly leafless peduncle arising from the underground parts of a 

 plant. 



Scapose. Bearing a scape, or resembling one. 



Scarious. Thin, dry, and membranaceous, and not green. 



Secund. Apparently borne along one side of an axis (usually referring to flowers). 



Seed. The ripened ovule, consisting of the embryo and its coverings. 



Segment. A natural division of an organ or structure, as of a separating fruit. 



Sepal. A division of the calyx. 



Septate. Provided with partitions. 



Sericeous. Very closely covered with fine appressed soft straight hairs of silky 

 appearance. 



Serrate. Having sharp teeth directed forward. 



Serrulate. Finely serrate. 



Sessile. Attached directly, without a stalk of any kind. 



Setaceous. Bristle-like. 



Setose. Beset with bristles. 



