KEY TO THE SPECIES 



2. Stamens as many as the lobes of the corolla or fewer 



Stamens opposite the corolla-lobes Priniulacew 59 



Stamens alternate with the corolla-lobes, or fewer. 



ii. Ovary superior (appearing within the flower) 



Corolla regular or nearly so. 



Stamens as many as the corolla-lobes. 

 Ovaries 2, becoming a pair of follicles. 



Pollen powdery .... Apocynaceae 61 



Pollen in 2 solid waxy masses . . . Asclepiadaceae 62 



Ovary 1. 



Ovary deeply 4-lobed around the style. 



Leaves alternate . . . Boraginacege 66 



Leaves opposite .... . . Labiatui 69 



Ovary not lobed, 1-celled, 



Corolla scarious and veinless ; leaves entire Flantaginacese 78 

 Corolla not scarious ; leaves not entire , Hydrophyllacese 65 

 Ovary 2- to lO-eelled ; stamens on the corolla-tube. 

 Stamens 4. 



Pod opening by a lid . . . . PlantaginacesB 78 



Pod not opening by a lid . . . . Verbenaceae 68 



Stamens 5. 



Fruit of 2 or 4 seed-like nutlets . BoraginacefB 66 



Fruit a many-seeded berry . . . . Solaiiaceae 71 



Fruit a many-seeded capsule. 



Style short or none ; stigma of two lamellae Gentiana 60 

 Style slender ; stigma entire Scrophulariaceae 73 



Fruit a few-seeded capsule. 



Style 1, 3-cleft . . . Polemoniaoese 63 



Styles 1 or 2, entire or 2-cleft . Convolvulaccie 62 



Stamens fewer than the corolla-lobes. 



Stamens 4 Terbenaceae 68 



Stamens 2. 



Stems naked PlantaginaccEe 78 



Stems leafy .... . Scrophulariaceae 73 



Corolla irregular, or rarely wanting. 

 Ovules and seeds solitary in the cells. 



Ovary 4-lobed Labiatse 69 



Ovary not lobed . . Verbenacepe 68 



Ovules and seeds 2 or more in each cell . . . Scrophalariacese 73 



b. Ovary inferior (appearing below the flower) 



Flowers not in an involucrate head. 



Leaves alternate Campanulacese 81 



Leaves opposite. 



Stamens 4 or 5 ; fruit berry-like .... Caprifoliaceae 78 



Stamens 3 ; fruit dry, 1-seeded . . . Valerianaceai 80 



Flowers in an involucrate head. 



All the flowers with strap-shaped corollas . . . Ciclioriaceae 81 



All but the ray flowers with tubular corollas . , Compositae 83 



