22 ANALYTICAL, KEY 



Ovary imperfectly 4-5-celled Martyniaceae, 741 



Ovary 1-2-ceUed. 

 Ovary 1-celled. 

 Parasites without green foliage, terrestrial; stamens 4 



Obobanchackae, 739 

 Not parasitic, chiefly aquatic or mud plants ; stamens 2 



Lentibulariaceae, 736 

 Ovary 2-celled. 

 Trees or woody climbers ; placentae parietal Bignoniaoeae, 740 

 Herbs, rarely trees; placentae in the axis. 

 Seeds (mostly numerous) not borne on hooks 



Scrophtjlakiaceae, 717 

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



placentae Acanthackae, 742 



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



T. Tendril-bearing herbs ; anthers often united Cucurbitaceae, 764 



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 CAMPANnLACEAE, 765 



V. Stamens inserted on the corolla. 



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

 Stamens 4-5 ; leaves opposite or whorled. 

 Ovary 2-5-celled. 

 Leaves opposite or perfoliate, but neither whorled 



nor provided with true stipules CAPRiroLiACEAE, 754 



Leaves either opposite and stipulate, or whorled and 



destitute of stipules Rubiaceae, 746 



Ovary 1-celled ; flowers in dense involucrate heads Dipsacaceae, 763 

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



Flowers separate, not involucrate; corolla irregular Lobeliaceae, 768 

 Flowers in an involucrate head Compositae, 770 



