GLOSSARY. 



405 



close to the summit or crown of 

 the root. 



Ray, the outer florets in the flower- 

 head of Composites ; the outer 

 flowers, when differently formed 

 from the inner, in umbels ; also 

 the branches of an umbel. 



Receptacle, a part which bears or 

 receives other parts, commonly 

 applied to that which bears the 

 flowers, as the expanded top of 

 the peduncle of a dandelion, the 

 inner surface of a fig, etc. 



Recurved, bent backward. 



Reflex, Rejlexed, very much curved 

 backwards. 



Regular, uniform in structure or 

 condition, as where subordinate 



. parts of the same kind closely re- 

 semble each other, and are sym- 

 metrically arranged. 



Remote, thinly set on the axis. 



Reniform, kidney-shaped, that is, 

 like a longitudinal section through 

 a kidney. 



Reticulate, resembling network. 



Retuse, having a slight depression or 

 sinus at the apex. 



Rhizome, a prostrate or subterranean 

 stem, from which roots are emit- 

 ted, and scaly leaves or branches 

 given off at the knots. 



Rhomboid, Rhomboidal, rudely ap- 

 proximating to the form of a 

 rhombus, that is to say, a quadran- 

 gular figure (not a square) whose 

 sides are equal. 



Rib, any strongly-marked nerve in 

 the leaf, but more especially the 

 central longitudinal one. 



Ribbed, having one or more strongly 

 marked nerves, proceeding from 



. the base to the apex. * 



Ridge, an elevated line on the car- 

 pels of Umbellifers, of which some 

 are primary and some secondary. 



Rigid, almost or quite without flexi- 

 bility. 



Ringent, applied to bilabiate corollas 

 whose lips are widely separate. 



Root-stock, a subterranean or pros- 

 trate stem, which emits roots from 

 its lower surface. 



Rosulate, having the parts more or 

 less laminated, and arranged in a 

 whorl round an axis, in a manner 

 somewhat resembling the disposi- 

 tion of the petals of a rose. 



Rotate, wheel-shaped ; having a mo- 

 nopetalous coroJla, with a very 

 short tube and spreading limb. 



Rudimentary, either in an early state 

 of development, or in an imper- 

 fectly-developed condition. 



Rugose, having the surface covered 

 with wrinkles. 



Runcinate, having the large marginal 

 incisions (in a leaf) directed iu a 

 curved manner towards the base. 



Saccate^ resembling a bag or sac. 



Sagittate, pointed at the apex, and 

 with the base prolonged backwards 

 from the sides into two acute ears, 

 like an arrow head. 



Salver-shaped, hypocrateriform. 



Samara, a compressed, few-seeded, 

 coriaceous or membranaceous in- 

 dehiscent pericarp, with a mem- 

 branaceous expansion or wing at 

 the end or edges, as in the fruit of 

 the Sycamore. 



Sapivood, the outermost layers in 

 the trunks of exogenous trees. 



Scabrous, harsh or rough to the 

 touch, from the presence of stiff 

 pubescence or scattered tubercles. 



