i2 + DIALYPETALAE 



Order XVI. Mai vales. 



Perianth double, rarely absent, mostly 5-merous. 

 Sepals generally valvate. Stamens mostly numerous, free 

 or the filaments connate, or as many as the perianth- 

 segments or double their number. Carpels 2 or more. 

 Ovules mostly numerous. Fam. 74 — 77. 



D. C a?' pels rarely free \ mostly connate^ sometimes inferior. 



Fam. 7 8- -1 06. 



Order XVII. Parietales. 



Perianth double. Stamens and carpels many or, as 

 in Viola etc., few. Carpels mostly connate. Placentae 

 parietal or meeting in the centre, rarely basal. 



Fam. 78 — 90. 



Order XVIII. Opuntiales. 



Perianth double; sepals and petals inserted spirally. 

 Carpels 4 or more, inferior. Succulent plants. Fam. 91. 



E. Carpels co?inate and inferior, generally adnate to the 



axis. 



Order XIX. Myrtiflorae. 



Flowers regular ; perianth double, rarely absent. 

 Floral axis more or less tubular, carrying the sexual organs 

 in the base or on the margin of the tube. Carpels 2 or 

 more. Fam. 92 — 103. 



Order XX. Umbel 1 ifl orae. 



Flowers regular. Perianth double. Stamens as 

 many as the petals. Carpels 2. Flowers umbellate. 



Fam. 104 — 106. 



* Orders treated in Volume n. 



