hdv INTRODUCTION. 



f Stamens 5, free 79 



OA j Stamens 3. Small plant with minute white flowers. 



bU i Montia Gen. (p. 136.) 



[_Stamens 2 or 4 81 



£.. f Corolla with a spur 82 



\ Corolla without a spur 83 



R9 f Two stamens. Capsule one-celled . . . Pinguicula Fam. (p. 548.) 



\ Four stamens. Capsule two-celled . . Sceophulaeia Fam. (p. 602.) 

 ftq f One or two seeds in the ovary or capsule . . Veevein Gen. (p. 676.) 



\ Several seeds in the capsule, or at least several ovules in the ovary . 84 



("Plant leafless, except scales of the colour of the stem. Capsule one-celled. 

 84 < Beoomeape Fam. (p. 595.) 



(^Leaves green. Capsule two-celled . . Sceophulaeia Fam. (p. 602.) 



Perianth simple or none. 



/Floating or submerged plants 86 

 Terrestrial herbs, or, if aquatic, erect from the bottom of the water, and 



projecting from it 93 



Trees or shrubs 141 



1. Floating Aquatic Flants. 



[ Small leaf-like fronds, attached two or three together, and floating 



86 <j without any stem Duckweed Gen. (p. 780.) 



[_ Leaves and flowers growing out of a distinct stem 87 



Leaves deeply divided into capillary lobes 88 



Leaves entire 89 



"Leaves pinnately divided. Perianth 4-lobed. 



Myeiophyll Gen. (p. 284.) 

 Leaves repeatedly forked. Perianth none or many-lobed. 



Ceeatophyll Gen. (p. 739.) 



Leaves opposite or whorled 90 



Leaves in a radical submerged tuft 137 



Leaves radical in floating tuft3 Feogbit Gen. (p. 802.) 



Leaves alternate 92 



Tube of the flower long and thread-like, resembling a pedicel. 



Elodea Gen. (p. 801.) 

 Flowers sessile, or nearly so, in the axils of the leaves, or in stalked 



heads or spikes, without any stalk-like tube 91 



' One four-lobed ovary. Two styles . . . Calliteiche Gen. (p. 740.) 

 Four ovaries, with distinct styles or stigmas . . Naiad Fam. (p. 782.) 



One simple ovary and style Maeestail Gen. (p. 285.) 



Flowers axillary. Perianth none, or of four small scales. 



Naiad Fam. (p. 782.) 

 Flowers in globular heads, the upper head male, the lower female. 



Perianth none, or of 1 to 6 small scales. Spaeganium Gen. (p. 776.) 



I Flowers glumaceous. Stamens 2 or 3 . . Floating Sciepus (p. 897.) 

 Perianth of 6 parts. Stamens 6 Jointed Rush (p. 873.) 



^Perianth of 5 parts. Stamens about 5. Amphibious Polygonum (p. 719.) 



2. Terrestrial Herbs, or, if aquatic, erect. 



f Flowers hermaphrodite, containing one or more ovaries and one or 



more stamens 94 



qo j Flowers diclinous, the stamens and ovaries either in separate pe- 

 rianths, or intermixed or variously arranged on the same spike, or 

 | within the same involucre, but separated by single scales only, with- 

 in out distinct perianths . 125 



85 < 



I 



87 1 

 88 



89 



90 

 91 



92 <j 



