O R 



or circle] cujus diameter longkudinaUs & tranfver- 

 fal'ts aquMes, perlpheria circinata : in plain Eng- 

 lifh, a round leaf, regarding the circumfcription 

 only, exemplified in the Riimex digynus. 



ORCHIDE.^ [Orchis, the firft gems in the 

 clafs Gynandria'] An order of plants in the Frag- 

 menta methodi naturalis of Linnseus : it confifts 

 of the following genera^ viz. Orchis, Satyrum, 

 Serapias, Herminium, Neottia, Ophrys, Cypripe- 

 dium, Epidendrum, Limodorum, Jrethufa. Or- 

 chideae funt aphrodifiacse. Lin. 



ORDO, order ; the firft fubdivifion in the 

 Linnsean fyftem of plants. In the firft thir- 

 teen claffes it is determined by the number of 

 the Pijlilla or female parts of generation, and 

 fignified by the Greek word Tvn, mulier, a wo- 

 man, compounded with the numerical terms, 

 l^avoi, tii, &c. as for inftance, Monogynia, one 

 woman, Digynta, two women, &c. The mtm- 

 bef of the P'l/lilla is generally taken from the 

 bafts of the Stylus ; but where the Stylus is de- 

 ficient, we muft eftimate by the Stigmata. The 

 orders in the remaining clafl'es are determined 

 by diftinflions in the fruit, the Pericarpium, 

 the Stamina, complication of fexes, i^c, 



ORGYA, 0§>y/«, idcml The laft degree in 



the 



