36 Key to the Families 



Ovary deeply 4-lobed around the style 7118. Echium, p. 794. 



Ovary not deeply lobed, many-ovuled. 



Filaments or some of them woolly 7460. Verbascum, p. 834. 



Filaments not woolly 7396. Hyoscyamus, p. 1087. 



S. Stamens with anthers 2 or 4. 

 Ovules solitary in the 1-4 cells. 



Ovary 4-lobed; style arising from between the lobes 



254. Labiatae, p. 798. 



Ovary not lobed; style from the apex. 

 Ovary 1-celled; fruit pointing backwards. .268. Phrymaceae, p. 866. 



Ovary 2-4-celled ; fruit not pointing backwards 



253. Verben aceae, p. 795. 



Ovules 2-many in each cell. 



Ovary imperfectly 4- or 5-celled 260. Martyniaceae, p. 860. 



Ovary 1- or 2-celled. 

 Ovary 1-celled. 



Parasites without green foliage, terrestrial ; stamens 4 



261. Orobanchaceae, p. 860. 



Not parasitic, chiefly aquatic or mud plants ; stamens 2 



264. Lentibulariaceae, p. 862. 



Ovary 2-celled. 

 Trees or woody climbers; placentae parietal. . Bignoniaceae, p. 858. 

 Herbs, rarely trees; placentae in the axis. 



Seed (mostly numerous) not borne on hooks 



257. SCROPHULARIACEAE, p. 882. 



Seed (2-12) borne on hooklike processes of the placentae 



266. ACANTHACEAE, p. 864. 



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

 T. Tendril-bearing herbs; anthers often united. . .275. Cucurbitaceae, p. 892. 

 T. Tendrils none U. 



U. Stamens separate V. 



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



stipules none; sap milky 276. Campanulaceae, p. 893. 



V. Stamens inserted on the corolla. 



Stamens 1-3, always fewer than the corolla lobes 



273. Valerianaceae, p. 890. 



Stamens 4 or 5; leaves opposite or whorled. 

 Ovary 2-5-celled. 

 Leaves opposite or perfoliate but never whorled, rarely provided 



with true stipules 271. Caprifoliaceae, p. 878. 



Leaves either opposite and stipulate, or whorled and destitute of 



stipules 270. Rubiaceae, p. 870. 



Ovary 1-celled ; flowers in dense involucrate heads 



274. Dipsacaceae, p. 892. 



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



Flowers separate, not involucrate ; corolla irregular 



276A. Lobeliaceae, p. 895. 



Flowers in an involucrate head 280. Compositae, p. 899. 



