Key to the Families 35 



Q. Ovary deeply 4-lobed. 



Leaves alternate 252. Boraginaceae, p. 787. 



Leaves opposite 254. Labiatae, p. 798. 



P. Ovary 1, not deeply lobed R. 

 R. Ovary 1-celled. 



Seed 1; corolla scarious 269. Plantaginaceae, p. 867. 



Seed several-many. 



Leaves entire, opposite 246. Gentian aceae, p. 754. 



Leaves toothed, lobed, or compound. 



Whole upper surface of the corolla white-bearded; leaflets 3, 



entire 6543. Menyanthes, p. 760. 



Corolla not conspicuously bearded; leaves, if compound, with 



toothed leaflets 251. Hydrophyllaceae, p. 784. 



R. Ovary 2-10-celled. 



Leafless twining parasites 6968. Cuscuta, p. 770. 



Leaves opposite, their bases connected by a stipular line 



245. Loganiaceae, p. 754. 



Leaves alternate or, if opposite, with no trace of stipules. 

 Stamens free from the corolla or nearly so. 



Style 1 233. Ericaceae, p. 733. 



Style none ; stamens attached to the base of the corolla 



157. Aquifoliaceae, p. 651. 



Stamens on the tube of the corolla. 

 Stamens 4. 



Leafy-stemmed ; leaves opposite ; corolla petaloid 



253. Verbenaceae, p. 795. 



Acaulescent; corolla scarious. . .269. Plantaginaceae, p. 867. 

 Stamens 5 or rarely more. 



Fruit of 2 or 4 seedlike nutlets 252. Boraginaceae, p. 787. 



Fruit a few-many-seeded pod or berry. 

 Styles 2. 

 Pod few, mostly 4-seeded.. .249. Convolvulaceae, p. 770. 



Pod many-seeded 251. Hydrophyllaceae, p. 784. 



Style 1, often branched. 



Branches of the style (or at least the lobes of the 

 stigma) 3. 



Plants twining 7003. Ipomoea, p. 776. 



Plants not twining 250. Polemoniaceae, p. 778. 



Branches of the style or lobes of the stigma 2 or rarely 4, 

 or 1 (in Solanaceae). 



Seed few, mostly 4 249. Convolvulaceae, p. 770. 



Seed many 256. Solanaceae, p. 826. 



O. Stamens fewer than the corolla lobes. 

 Stamens with anthers 4, in pairs. 



Ovary 2-celled; cells several-seeded 266. Acanthaceae, p. 864. 



Ovary 2-4-celled; cells 1-seeded; ovary not lobed; style apical 



253. Verbenaceae, p. 795. 



Ovary 4-celled, 4-lobed; style basal 254. Labiatae, p. 798. 



Stamens with anthers only 2 or rarely 3. 



Ovary 4-lobed 7326. Lycopus, p. 821. 



Ovary 2-celled, not 4-lobed. 

 Herbs. 



Acaulescent; corolla scarious 269. Plantaginaceae, p. 867. 



Leafy-stemmed; corolla not scarious 7579. Veronica, p. 845. 



Trees or shrubs 243. Oleaceae, p. 751. 



N. Corolla irregular S. 



S. Stamens with anthers 5. 



