50 



Anthers opening on the outer side. Embryo of the seeds straight, 



with a slit on the .side near the base. JDNCAGINE;E. p. 319. 

 Anthers opening on the inner side. Embryo curved. 



ALISMACE.*:. p. 319. 



115. Carpels combined into a single ovary. 116 

 Carpels more or less distinct. 



Anthers opening on the outer side. MELANTHACE.K p. 337. 

 Anthers opening on the inner side. 



Perianth of two parts. PHILYDRACE^. 

 Perianth of six parts. 



Stamens nine or more. Ovaries six, with many ovules in each. 



Flowers perfect. BUTOMACE.E. p. 320. 

 Stamens six. Flowers imperfect, monoecious. Ovaries numerous, 



on a rounded receptacle, with one ovule in each. 



TRIURIDA 



116. Anthers opening on the outer side. Outer perianth glume-like. 



Plants resembling the grasses. XYRIDACE.S. p. 351. 

 Anthers opening on the inner side. 



Flowers more or less irregular. Perianth rolling inwards after 



opening. Aquatic. PONTEDERIACE^. p. 322. 

 Flowers regular. Perianth not rolling inwards. 



Inner perianth minute, of a single lobe, or urn-shaped, or five 



toothed. GILLIESIACE.E. 

 Inner and outer perianth alike, or nearly so. 



Perianth tubular, commonly rough or hairy outside. 



HJEMODORACE^E. 

 Perianth smooth inside and outside. Anthers versatile. 



LILIACE.E. p. 337. 



117. Leaves netrveined. Flowers regular, inconspicuous, imperfect. 

 Staminate flowers with six stamens. Fertile flowers with three 

 carpels. Styles three, nearly or wholly distinct. 



DIOSCORACE.E. p. 335. 

 Leaves mostly parallel-veined. 



