Typhaceae, Sparganiaceae 1 1 



Fam. I. Typhaceae. Herbs with rhizomes and 

 distichous, Hnear leaves. Inflorescence cyh'ndrical, % 

 flowers below, </ above. ,^ flowers of 2-5 stamens often 

 united ; pollen in tetrads. % floivers of one carpel on 

 an elongated axis which bears hairs. Stigma narrow. 

 Ovule one, pendulous. Fruit an achene. Seed with 

 thin perisperm and fleshy endosperm. 



Only genus: Typha. 



Fam. 2. Sparganiaceae. Herbs. Leaves dis- 

 tichous. Inflorescence globose. Loiver i?iflorescences %, 

 upper </. Flowers homochlamydeous ; tepals 3-6. 

 Stamens 3-6. Carpels (1-2) each with one pendulous 

 ovule. Stigmas 1-2, lanceolate. Fruit a drupe. Seed 

 with mealy endosperm. 



Only genus : Sparganium. 



/3. Naked flowers still present: but in this order there occur 

 all possible gradations from Achlaviydy to Heteroclila?nydy^ also 

 from Hypogyny to Epigyny. Sporophylls definite or indefinite. 

 (For a see page 10, for y see page 15.) 



Order 2. Alismatales (Fluviales, Helobiae). Her- 

 baceous water or marsh plants with scales {Squamulae 

 intravaginales) in the leaf axils. Floivers cyclic or 

 hemicyclic; achlamydeous, haplochlamydeous or di- 

 plochlamydeous (homochlamydeous or heterochlamy- 

 deous); hypogynous, or epigynous. Stamens 00 -i. 

 Carpels 00 -i, usually apocarpous when superior. Endo- 

 sperm absent or scanty. 



Suborder i. POTAMOGETONINEAE. Floivers hypo- 

 gynous, achlamydeous or haplo- to homochlamydeous. 



Fam. I. POTAMOGETONACEAE. Submerged or 

 floating fresh or salt water plants. Leaves mostly dis- 

 tichous. Flowers mostly small, solitary or in spikes, 

 diclinous or monoclinous with 4-1-merous whorls. 



