GLOSSARY OF TECHNICAL TERMS 307 



Radiate. Spreading from a common center. 



Receptacle. The axis of a flower bearing the floral organs, or the common 



axis or support of a flower cluster. 

 Reflexed. Directed backwards or outwards. 

 Regular. Said of all parts equal in shape or size. 

 Reticulated. Netted, said of veins when they are arranged in a net- work 



fashion. 

 Retrorse. Directed backward or downward. 

 Retuse. The apex rounded and slightly indented. 

 Revolute. Rolled backward. 

 Rhachis. Same as rachis. 

 Rostrate. Beaked. 



Rudimentary. Imperfectly developed. 

 Rugose. Wrinkled. 



Sagittate. Shaped like the head of an arrow. 



Samara. An indehiscent winged fruit; for example, the key fruit of the 



maple. 

 Scabrous. Rough and coarse to the touch. 

 Scaly. Furnished with scales or scale-like. 

 Seed. The fertilized and mature ovule. 

 Semi-. In a Latin compound, meaning half. 

 Sepal. A division or leaf of the calyx. 

 Sepaloid. Sepal-like. 

 Septate. Divided by a partition. 

 Septicidal. Splitting open through the partitions. 

 Septum. A partition. 

 Seriate. In rows. 

 Sericeous. Silky. 



Serrate. The margin beset with teeth pointing forward. 

 Serrulate. Serrate with fine teeth. 

 Sessile. Without a stalk. 

 Setose. Beset with bristles. 

 Setulose. Provided with minute bristles. 

 Shrub. A woody plant not over five m. high, and usually dividing into 



several small stems at the ground. 

 Simple. Of one piece, in contrast to compound. 

 Sinuate. Wavy margined. 



