APPENDIX I 415 



A. — Orders with predominating Inconstancy in the 



Number of Floral Leaves. 



Order i. Pandanales. — Flowers naked or with 

 homochlamydeous, bract-like perianth, unisexual ; 

 stamens i to many; carpels i to many; endosperm 

 present ; inflorescence compound, spherical or cylin- 

 drical. 



Family i. Typhacese (Vol. Ill, p. 347). — Plant 

 monoecious ; male flowers above, hermaphrodite below, 

 spadix cylindrical ; no spathe ; perianth of scales or hairs ; 

 triandrous ovary 1-2 locular ; style persistent. 

 Genus. Typha (Vol. Ill, p. 350.) 

 Family 2. Sparganiaceae. (By some united with the 

 last.) Inflorescence globose ; lower inflorescence herma- 

 phrodite ; upper male. 



Genus. Sparganimn (Vol. Ill, p. 348). 



Order 2. Alismatales (Fluviales, Helobiese). — 

 Flowers cyclic or hemicyclic ; perianth wanting or in 

 I or 2 whorls; homo- or heterochlamydeous, hypo- 

 gynous, or epigynous; stamens i to many; carpels 

 I to many; apo- or syncarpous; endosperm little or 

 none. 



Sub -Order i. FoxAMOCETONiNEiE. — Flowers hypo- 

 gynous, achlamydeous, or haplo- to homochlamydeous. 



Family i. Potamogetonacese. — Flowers solitary or 

 in spikes, with parts of the flowers in whorls of 4-1 ; 

 achlamydeous as a rule ; stamens 4-1 ; carpels 4-1 ; ovule 

 pendulous. 



Tribe i. Zosterece. 



Genus. Zostera (Vol. Ill, p. 383). 

 Tribe 2. Potamogetotiece. 



Genera. Foiamogeton (Vol. Ill, p. 378), Ruppta, 



