134 SUMMER FLOWERS. 



4. Cistaceous plants shrubs or herbs ; flowers with three (or 



five) sepals and five regular petals ; stamens numerous. 



5. Resedaceous plants herbs ; flowers irregular, with four to 



six sepals, and several small unequal petals, some of which 

 are divided ; stamens few. 



J{ Stamens definite. 

 Stamens tetradynamous ("4 long, 2 snort), distinct. 



(5. Cruciferous plants herbs ; flowers regular ; sepals four ; pe- 

 tals four, arranged crosswise. 



Stamens 6, united in two sets. 



7. Fumariaceous plants herbs ; flowers very irregular ; sepals 



two ; petals four. 



Stamens 4 or 5, alternating with the petals, sometimes 

 ivith accessory or additional ones opposite the petals. 



8. Frankeniaceous plants herbs ; flowers regular, with four 



or five sepals and petals, and usually with accessory stamens. 



9. Tamaricaceous plants shrubs, with scale-like imbricating 



leaves ; flowers regular, with four or five sepals and petals. 



ttt Seeds attached in the axis or centre of the carpels (i. e. 

 placentas axile). 



J Flowers regular (i. e. the parts equal as to size and form). 

 Sepals overlapping at the edge (i. e. imbricate) . 

 || Ovary one-celled. 



10. Gary ophyllaceous plants herbs; leaves opposite, undi- 



vided, without stipules ; flowers symmetrical, with four or 

 five sepals and petals, and definite stamens. 



11. Illecebraceous plants herbs ; leaves opposite or alternate, 



furnished with stipules ; flowers inconspicuous ; calyx 3-5- 

 lobed ; petals 3-5, often rudimentary or wanting ; stamens 

 as many as the sepals, rarely fewer. 



