TO BOTANY. 127 



simple. It is called Spica secunda, a single- rowed 

 spike, when the flowers are all turned one way : and 

 Spica disticha, a double-rowed spike, when the 

 flowers stand two ways. 



A Corymbus*, is a kind of spike, the flowers of 

 which have each its proper pedunclef, or partial 

 footstalk, raised to a proportionable height; as in 

 Spiraea opulifolia and Ledum. 



A Panicle, is a fructification dispersed on peduncles 

 variously subdivided. It is a diffuse panicle, when 

 the pedicelli are divaricate, spreading asunder ; and 

 a coarctate or confined one, when they stand close 

 to each other. 



A Thyrsus, is a panicle contracted into an ovate 

 form ; as in Syringa and Petasites. 



A Racemus J consists of a peduncle that has short 

 lateral branches ; as in Vitis and Ribes. 



Verticillus, a whorl, expresses a number of flowers 

 that are subsessile, and are produced in rings round 

 the stems. 



5. A Petiole, pr footstalk of a leaf, is a species 

 of trunk that fastens the leaves but not the fructifica- 

 tion; which circumstance, distinguishes it from a 

 peduncle, which is the footstalk of a flower, as has 

 been explained above. There are some cases where 

 the fructification and leaves are borne on the same 

 footstalks; as in Turnera and Hibiscus; but these 

 instances are very rare. 



* Corymbus, in its ancient and proper signification, meant 

 a bunch of ivy berries ; but it is now used as a botanical term 

 for all fructifications that are produced in the same manner. 



f In the Philosophia Botanica it is not peduncle, but pe- 

 tiolus j which seems to be a mistake, this term being applied 

 to leaves only. 



J Racemus, anciently signified a bunch of grapes. 

 ^ With no footstalks, or with very short one?. 



