508 



BOTANY. 



Armeria vulgaris, Thrift, of Europe, is cultivated in flower-gardens. 

 Plumbago; several South African and East Indian species, are to be 

 met with in conservatories. 



586. Cohort XVIII. Ericales. Plants with regular 

 flowers, and superior two to many-celled ovaries ; stamens as 

 many or twice as many as the corolla lobes, hypogynous or 

 epipetalous. 



Order Lennoacese. Californian and Mexican leafless root-parasites. 



Order Diapensiacese. Low plants (six to eight species) of North 



America and Eastern Asia, of much botanical, but no economic interest. 



Order Ericaceae. The Heath Family. Mostly shrubs or small 

 trees, a few herbs, with usually alternate, simple, and entire leaves ; 

 ovary mostly five-celled, with placentae in the axis ; anthers opening 

 by a terminal pore, rarely by a lateral slit ; pollen grains compound, 

 rarely simple. 



Under these characters are included about 1700 species, which are 

 often regarded as constituting five orders, viz., Ericinese, Epacridese, 

 Pyrolinese, Monotropeae, and Vaccinieae, here to be considered as sub- 

 orders. While, however, there are considerable differences between 

 the plants here brought together, they are not important enough to 

 counterbalance the many evident resemblances. The relationship sub- 

 sisting between the sub-orders may be shown as follows : 



VACCINIEAE. 

 ^7 (Ovary inferior.) 



EPACRIDE^ < 



f Stamens epipetal- 

 I ous or hypogyn- 

 1 ous ; anthers 

 [with a slit. 



-ERICINE^E- 



PYROLINEJ3. 

 (Choripetalous.) 



Qamopetalous ; 

 ovary superior ; 

 stamens hypogyn- 

 ous ; anthers 

 with a pore ; pol- 

 1 e n grains com- 

 [ pound. 



MONOTROPEvE. 



j Choripetalous; anthers with a) 

 ( slit ; pollen grains simple. J 



