20 American Midland Naturalist Monograph No. 2 



11. Leaves without stipules; sepals 5; stamens 5; fruit a utricle 



51. Chenopodiaceae 



10. Petals usually present. 



12. Flowers regular; leaves stipulate. 



13. Stamens 10 (rarely 5), free or nearly so; ovary 5-!obed, 



each lobe becoming a I -seeded nutlet 85. GeraniacEAE 



13. Stamens more than 10. 



14. Stamens free, perigynous; anthers 2-loculed; fruit an 



achene 83. RosACEAE 



14. Stamens monadelphous ; anthers l-loculed; fruit a cap- 

 sule, or of 5 or more carpels arranged in a ring 



1 05. Malvaceae 



12. Flowers irregular. 



I 5. Leaves with stipules; stamens 5; fruit a capsule 



108. ViOLACEAE 



15. Leaves without stipules; stamens many; fruit an achene, fol- 

 licle, or berry : 62. Ranunculaceae 



3. Leaves not lobed, merely toothed, or sinuate. 



16. Petals more or less united (corolla sympetalous) ; fruit a capsule or berry. 

 17. Ovary inferior; corolla blue or red (rarely white). 



18. Corolla split down one side, irregular; stamens united by their anthers 

 151. LOBELIACEAE 



18. Corolla not split, regular; stamens free 150. Campanulaceae 



17. Ovary superior; flowers not red or blue. 



19. Stamens 5. 



20. Calyx spurred, petal-like; flowers axillary; leaves exstipulate; 



plants smooth and succulent 88. Balsaminaceae 



20. Calyx not spurred or petal-like. 



21. Flowers in spikes or racemes; fruit a smooth capsule 



Verhascum in 137. ScrophulariaceaE 



21. Flowers axillary or in cymes; fruit a berry or a spiny capsule 



1 36. Solanaceae 



19. Stamens 4 or 2. 



22. Low branching odoriferous glandular annuals with cordate oblique 

 leaves; calyx 5-cIeft; corolla 5-lobed; capsule 8-15 cm. long, 



the curved beak longer than the body 141. Martyniaceae 



22. Erect perennials; sepals 4; corolla campanulate, 2-3-lobed; stam- 

 ens 2; capsule short, emarginate 



Spn</ipns in 137. Scrophulariaceae 



16. Petals separate or none. 

 23. Petals none. 



24. Plants with stinging hairs; leaves petioled, serrate, stipulate; flowers in 

 axillary cymes, unisexual; sepals 5; stamen 1; style I; fruit an 



achene Laportea in 46. Urticaceae 



24. Plants without stinging hairs. 



25. Styles 5 or 6; stamens twice as many as the sepals; flowers perfect, 

 in I -sided spikes or cymes; stipules none; fruit many-seeded, 



dehiscent Peitlhonim in 75. Crassulaceae 



25. Styles 1-3. 



26. I' ruit a 3-lobed capsule; stigmas fringed; leaves with small 



stipules Acalvpha in 92. EuPHORBIACEAE 



26. Fruit a I -seeded utricle; stipules none 51. CuENOPODIACEAE 



23. Petals present. 



27. Ovary inferior; stamens usually twice as many (rarely the same num- 

 ber) as the petals and calyx-lobes; fruit a capsule, rarely indehiscent 



115. Onagraceae 



27. Ovary superior. 



28. Corolla irregular. 



