R^phtm. The frame-like placenta left by the falling away 

 of the valves in Cruciferae. 



Retrorse. Turned back or downward. 



Revolute. With the margia or apex rolled backward. 



Rhizome. An underground, somewhat horizontal, root- 

 ing stem. 



Riwient. Gaping; applied to labiate flowers with open 

 throats. 



Rostrate. Beaked. 



Rotate. Wheel-shaped. 



Rugose. Wrinkled ; ridged. 



Runcinate. Deeply-toothed or lobed, with the segments 

 directed backwards. 



Saccate. Sac-shaped. 



Samara. An iodehis'eiit membraueously-winged fruit, 

 as in the ash and maple. 



Sagittate. Shaped like an arrow-head 



Scabrous. Eough to t'a-^ t )uch, with minute rigid points. 



Scape. A naked peduncle rising from the ground. 



Scapigerous. Producing scapes. 



Scarious. Thin, dry aud membranaceous. 



Schizocarp . An ovary which divides into its component 

 parts, each part usually remaining closed over its seed. 



Secund. One-sided 



Septicklal Opening through the lines of junction of the 

 carpels. 



.Septifragal. Breaking away from the partitions in de- 

 hiscence. 



Serrate. Haviug teeth directed forward, like those of a 

 saw. 



Serrulate. Finely serrate. 



Sessile. Without footstalk. 



Setaceous. Bristle-like. 



Siliculosa. Short cruciferous pod, as Capsella. 



Siliquosa. Long cruciferous pod, as ia mustard. 



Sinuate. With a strongly wavy margin. 



