22 ANALYTICAL KEY 



Ovary imperfectly 4-5-celled MARTYNIACEAE, 741 



Ovary 1-2-celled. 

 Ovary 1-celled. 

 Parasites without green foliage, terrestrial; stamens 4 



OROBAXCHACEAE, 739 

 Not parasitic, chiefly aquatic or mud plants ; stamens 2 



LENTIBULARIACEAE, 736 

 Ovary 2-celled. 



Trees or woody climbers; placentae parietal BIGNONIACEAE, 740 

 Herbs, rarely trees; placentae in the axis. 

 Seeds (mostly numerous) not borne on hooks 



SCROPHULARIACEAE, 717 



Seeds (2-12) borne on hook-like processes of the 



placentae ACANTHACEAE, 742 



M. Ovary adherent to the calyx-tube (inferior) T. 



T. Tendril-bearing herbs ; anthers often united CUCURBITACEAE, 704 



T. Tendrils none U. 

 U. Stamens separate V. 



V. Stamens free from the corolla or nearly so, as many as its 



lobes; stipules none ; juice milky CAMPANULACEAE, 7G5 



V. Stamens inserted on the corolla. 



Stamens 1-3, always fewer than the corolla-lobes VALERIANACEAE, 761 

 Stamens 4-5 ; leaves opposite or whorled. 

 Ovary 2-5-celled. 

 Leaves opposite or perfoliate, but neither whorled 



nor provided with true stipules CAPRIFOLIACEAE, 754 



Leaves either opposite and stipulate, or whorled and 



destitute of stipules RUBIACEAE, 746 



Ovary 1-celled ; flowers in dense involucrate heads DIPSACA< KA E, 7i>:> 

 U. Stamens united by their anthers ; these joined in a ring or tube. 



Flowers separate, not involucrate ; corolla irregular LOBELIAOEAE, 768 

 Flowers in an involucrate head COMPOSITAE, 770 



