Key to the Families xi 



Ovary 1, not lobed. 

 Ovary 1-celled. 



Leaves opposite, entire. Gentianageae, 303. 



Leaves mostly alternate and seldom entire. 



II VDKOPHYLLACEAE, 319. 



Ovary 2-celled; corolla not scarious. 

 Leafy plants. 



Calyx 5-toothed. Solanaceae, 349. 



Sepals 5, distinct. Convolvulaceae, 307, 452. 



Leafless parasitic plants; herbage yellowish. 



Ccscdtaceae, 310. 

 Ovary 3-celled; styles 3-cleft; capsule 3-valved. 



Polemoniaceae, 311. 

 Ovary 2-4-celled; corolla scarious. Plantaginaceae, 375. 



Ovary 1, deeply 4-lobed, forming 4 nutlets. 



Leaves alternate. Boraginaceae, 328. 



Leaves opposite. Mentha, 348. 



('orolla irregular. 

 Stamens 4 or 2. 



Ovary 1-celled; parasitic plants. Orobanchaceae, 373. 



Ovary 2-celled. Scrophulariaceae, 355. 



Ovary 4-celled, not lobed, splitting into 4 nutlets. 



Verbenaceae, 338. 

 Ovary 4-lobed, splitting into 4 nutlets. Labiatae, 338. 



Stamens 5; ovary 2-celled. Verbascu.m, 356. 



** Ovary inferior. 



Stamens distinct. 



Leaves alternate. Campandlaceae, 385. 



Leaves opposite or whorled. 

 Ovary 1-celled. 



Stamens 1-3; slender spring annuals. Valerianaceae, 382. 

 Stamens 2-4; stout late summer herbs. 



Dipsaceae, 383. 

 Ovary 2-5-celled. 



Ovary 2-celled ; flowers regular, minute; stems usually 4-angled. 



Rubiaceae, 377. 

 Ovary 2-5-celled; flowers regular or irregular. 



Caphifoliaceae, 380. 

 Stamens united into a tube around the ovary. 

 Flowers not in heads. 



Stamens 3; flowers regular. Cucurbitaceae, 384. 



Stamens 5; flowers irregular. Campanulaceae, 385. 



Flowers in heads on a common receptacle, ligulate or tubular. 



Compositae, 389. 



