CALYCIFLORiE 225 



Australia. The other genera are not so universal in 

 distribution. Aldrovanda is an aquatic type. The 

 Sundews grow on heaths or bogs where nutriment, 

 apart from their insect victims, is poor. The habit 

 seems to be derived from a specialisation of the 

 ordinary glands found in many plants which often 

 secrete sticky or other liquids. 



The members of this group are perennial, her- 

 baceous, usually rosette plants, with the leaves 

 entire, and variable in form, spreading out hori- 

 zontally. The leaves are mainly radical and covered 

 with glands, with stipules, a few stem-leaves being 

 produced, which are alternate. 



The flowers are in terminal, circinate cymes, or 

 racemes, sometimes solitary. They are regular, 

 symmetrical, and hermaphrodite. The bulk of the 

 flowers are hypogynous, or perigynous in exotic 

 species, and such types have been included in the 

 Thalamiflorae. They show affinity with the Saxifrage 

 group, some of the members of which are semi- 

 insectivorous, and also with Parnassia, which has been 

 included in the group. The parts of the flower are 

 in fours or fives. 



The calyx is made up of five (or four to eight) 

 lobes, and is persistent, imbricate in bud, distinct 

 from the ovary. The corolla is regular, and made up 

 of five petals, distinct or united at the base, imbricate 

 or convolute. The stamens, which are four to twenty, 

 usually five, alternate with the petals, and are almost 

 hypogynous. The pollen is in tetrads as in the 



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