10 ANALYTICAL KEY. 



3. Stamens as many as the lobes of the corolla and alternate with them, or fewer. 

 * No green herbage. 



Corolla regular; stamens free; seeds numerous, minute Monotropeae, 69 



Corolla regular; stamens on the tube; twining parasites Convolvulaceae, 86 



Corolla irregular; stamens 4 in pairs Orobanchaceae, 96 



* * With ordinary green herbage. 

 HE- Corolla regular or nearly so; stamens not in pairs. 



Corolla transparent and veinless; leaves all radical Flantaginaceae, 103 



Corolla more or less veiny. 

 Stamens 5 or 4, as many as the corolla lobes. 



Pollen in waxy masses; fruit a pair of follicles Asclepiadaceae, 73 



Pollen in powdery grains. 



Ovaries 2; fruit a pair of follicles Apocynaceae, 73 



Ovary 4-lobed, forming 4 seed-like nutlets Borraginaceae, 83 



Ovary single and entire 



Style 3-cleft; capsule 3-celled; corolla convolute Polemoniaceae, 75 



Styles or stigmas 2 or 1. 



Seeds 4 at most, large; peduncles axillary Convolvulaceae, 86 



Seeds few or many; embryo small, in albumen. 

 Leaves opposite or whorled, entire; or 



Leaves alternate, 3-foliolate, leaflets entire Gentianaceae, 74 



Leaves various, mainly alternate. 

 Styles 2, or 1 and 2-cleft; capsule 1-2-celled. . . .Hydrophyllaceae, 80 



Style 1 ; capsule or berry 2-celled Solanaceae, 88 



See also Romanzoffla in Hydrophyllaceae, 80 



And Limosella in Scrophulariaceae, 89 



*- 4- Corolla irregular; stamens with anthers 4 in pairs, or 2 ; style 1. 



Ovary and capsule 2-celled Scrophulariaceae, 89 



Ovary 4-parted; fruit 4 seed-like nutlets Labiatae, 97 



Ovary undivided; fruit splitting into 2 or 4 nutlets Verbenaceae, 102 



APETALOUS FORMS IN POLYPETALOUS AND GAMOPETALOUS ORDERS. 



Carpels 1 or 2, rarely 3, distinct and free; stamens on the calyx Rosaceae, 49 



Capsule 2-celled, 2-seeded, flattened Cruciferae, 22 



Shrub with alternate simple leaves; flowers 4-merous Rhamnaceae, 35 



Trees with opposite compound or lobed leaves. 



Fruit 1-seeded, winged (samara) Oleaceae, 73 



Fruit a pair of winged carpels (samaras) Sapindaceae, _ 37 



Herbs; ovary 1-celled; style and stigma 1; leaves opposite Primulaceae, 72 



