16 American Midland Naturalist Monograph No. 7 



4. Leaves with black or pellucid dots, opposite, entire; flowers yellow or 

 pink. 



5. Styles 2-6; stamens more numerous than the petals 



19. Hypericaceae 



5. Style 1 ; stamens as many as the corolla-lobes 97. Primulaceae 



4. Leaves not punctate. 



6. Leaves with stipules; petals minute or absent; stigmas 2-4. 



7. Petals 2 or 3; capsule several-seeded, the seeds reticulated; leaves 



oblanceolate or obovate; small plants of wet ground 



20. Elatinaceae 



7. Petals none; fruit a 1-seeded utricle 29. Illecebraceae 



6. Leaves without stipules. 



8. Plants with milky juice; capsule deeply 3-lobed; upper leaves 



usually whorled; flowers small, white or greenish 



43. EUPHORBIACEAE 



8. Plants with colorless juice. 



9. Flowers solitary; stamens 6; ovary superior, 3-loculed 



genera in 130. Liliaceae 



9. Flowers not as above in all respects. 



10. Flowers irregular, in spikes or racemes; sepals 5, three of 

 them small, and two larger and colored like the 3 petals; 



fruit flattened 42. Polygalaceae 



10. Flowers regular. 



11. Leaves in whorls. 



12. Flowers axillary; leaves in fives or sixes; petals none; 

 sepals 5 ; fruit a small 3-valved capsule ; plants 



annual, prostrate 26. Aizoaceae 



12. Flowers in cymes or panicles; petals 5; plants 

 perennial. 

 13. Leaves (at least the lower) in threes; flowers in 



cymes; petals entire; fruit a follicle 



Sedum in 60. Crassulaceae 



13. Leaves mostly in fours, acuminate; inflorescence 

 paniculate; petals laciniate; fruit a capsule .... 



Silene in 24. Caryophyllageae 



1 1. Leaves not whorled (or if so, not thick and succulent). 

 14. Calyx and corolla absent; flowers small, green, soli- 

 tary, axillary; leaves spatulate or linear; styles 2, 

 filiform; fruit notched; small plants of wet soil 



85. Callitrichaceae 



14. Calyx present; corolla present or absent. 

 15. Sepals separate. 



16. Petals none; flowers crowded into an inter- 

 rupted spike; calyx woolly; bracts scarious; 



leaves lanceolate, sessile 



28. Amaranthaceae 



16. Petals usually present; inflorescence not as 

 above. 



17. Sepals 2; stamens 5; style 3-cleft 



Claytonia in 25. Portulacaceae 



-17. Sepals 5; leaves more than 1 pair. 

 18. Sepals equal gr nearly so. 



