13 PRACTICAL BOTANY. 



having their tips distinct or obsolete, the calyx is said to-be 

 gamosepalous or monosepalous (one-sepalled). (PI. V., 7.) 

 If, on the other hand, they are not in any way united into 

 one piece, the calyx is called polysepalous (many-sepalled.) 

 (PI. lY., 6.) 



If the Petals are united into one body in the same 

 manner, we call the corolla monopetalous (one-petalled) or 

 gamopetalous (PI. YIII., 2) ; and if the flower has its pe- 

 tals distinct, the corolla is said io he polypetalous. (PI. 

 IV., 4.) 



41. The PHJENOGAMors Sekies divides into Two 

 Classes. 



43. The Mrst Class of the Phmnogams (the class of 

 the higher grade) comprises the Plants with wood in a 

 zone, or circle, or in concentric annual rings (PI. II., 29) 

 around a central pith / netted^eined leaves, parts of the 

 flower onostly in fives or fours, and a dicolyledonmis 

 (two-leaved) embryo. This is the Class of the Exogenous 

 or Dicotyledonous plants, which we briefly call Exogens. 



43. The Second Class of the Phmnogams comprises 

 those plants, which have their wood disposed in separate 

 threads,, scattered thro^igh the diameter of the stem, not in 

 a circle (PI. II., 28); ^e flirral parts visually in threes, 

 never in fives / the leaves nearly always longit/udinally 

 vehied ; and a mionoeotyledonous {pne-lea/oed) emihryo. 

 This is the class of the endogenous or monocotyledonous 

 plants, which we briefly call Endogens. " 



44. The CLASS EXOGEISTS is divided into two sub- 

 classes — the Angiosperms and the Gymnosperms. 



45. The Gymnospekms are characterized by having 

 their ovules (and seeds) naked — that is, not hidden in a 



