134 SUMMER FLOWERS. 



4. Cistaeeous 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. 



Xi Stamens definite. 

 § Stamens tetradynamous (4 long, 2 sJiort), distinct. 



6. 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 tlie petals, S07netimes 

 ivitJi 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 ; fiowers regular, with four or five sepals and petals. 



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

 placentas axile). 



X Flowers regular (\. e. the parts equal as to size and form) . 



§ Sepals overlapping at the edge (\. e. hribricate). 



II Ovary one-celled. 



10. Caryophyllaceous 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. 



