274 THE STORY OF PLANT LIFE 



the stamens are inserted on the top of the ovary in 

 the Harebell group and Heath group. In the Brook- 

 weed amongst the Primrose group the ovary is 

 inferior as here. In Lobelia amongst the Harebell 

 group the stamens are epipetalous. 



In a second series the ovary is superior, the stamens 

 are epipetalous. In some Heaths they are hypogynous, 

 however, as also in the Ash amongst the Ash group, 

 in the Shoreweed amongst the Plantain group, and 

 in the Sea Lavenders. 



The corolla is regular. There are eight or ten 

 stamens, rarely five or six. The anthers open, as a rule, 

 by pores, and the ovary is four- to six-celled in the 

 Heath group and Bird's Nest group. The stamens 

 are four to five, opposite the corolla-lobes, the ovary 

 one-celled, the placenta central in the Sea Lavender 

 and Primrose groups. There are tw^o, one, or four 

 stamens alternate with the corolla-lobes, a two-celled 

 ovary, and opposite leaves, except in the Bogbean, 

 where they are alternate, in the Ash group. Periwinkle 

 group, and Gentian group. 



The corolla is regular or subregular, with four to 

 five stamens alternate with the corolla lobes, the 

 ovary two- to four-celled, the leaves alternate or 

 radical, in the Jacob's Ladder group. Hound's Tongue 

 group, Convolvulus group, Deadly Nightshade group, 

 and Plantain group. 



The corolla is irregular, rarely subregular, with 

 two or four stamens, rarely five, with a one- to two- 

 celled ovary, many-ovuled cells, opposite or alternate- 



