Glossary [379] 



Rachis. An axis bearing leaflets, as in a compound leaf. 

 Receptacle. The more or less expanded portion of an axis which 



bears the organs of a flower or the collected flowers of a 



head. 

 Recurved. Curving downward or backward. 

 Reflexed. Abruptly turned downward. 

 Regular flower . Radially symmetrical; similar parts of same shape 



and size. 

 Remotely. Scattered, not close together. 

 Reniform. Kidney-shaped. 

 Repand. With a slightly sinuate margin. 

 Reticulate. Netted. 



Retrosely. Directed backward or downward. 

 Revolute. Rolled backward, margin rolled toward the lower 



side. 

 Rhombic. Having the shape of a rhombus. 

 Rufous. Red-brown. 

 Rugose. Wrinkled. 



Samara. An indehiscent, winged fruit. 



Scabrous. Rough to the touch. 



Scarious. Thin, dry, membranceous, not green. 



Scorpioid. A form of unilateral inflorescence circinately coiled 



in the bud. 

 Scurfy. Covered with small branlike scales. 

 Serotinus. Late in bearing or opening. 

 Serrate. Toothed, the teeth pointing upward or forward. 

 Sessile. Without a stalk. 



Sheath. A tubular envelope, or enrolled part or organ. 

 Shrub. A woody, bushy plant, branched at or near the base 



and usually less than 15 feet in height. 

 Sinuate. With a strong, wavy margin. 

 Sinus. The cleft or space between two lobes. 

 Spike. A simple inflorescence of sessile flowers arranged on a 



common, elongated axis. 

 Spine. A sharp, mostly woody outgrowth in the position of a leaf 



or stipule. 

 Spinescent. With short, rigid branches resembling spines. 

 Spinose. Furnished with spines. 



Stamen. The pollen-bearing organ of the male flower. 

 Staminate. Male flowers; provided with stamens but without 



pistils. 

 Stellate. Star-shaped. 



