10 American Midland Naturalist Monograph No. 2 



13. Sepals 5 or more; petals 5 or none. 



14. Pistils several to many, separate, simple; fruit achenes or follicles 



62. Ranunculaceae 



14. Pistil 1; fruit a succulent drupe, or the seeds berry-like; petals 



small, gland-like Caiiloph^llum in 66. Berberidaceae 



12. Stem with usually 2 or more alternate leaves, or 2 or more pairs of 

 leaves. 

 15. Leaves, or some of them, opposite. 

 16. Leaves pinnate or pinnalely lobed. 



17. Sepals 4, purple, petaloid; petals none; stamens numerous; 



plants climbing; achenes with hairy persistent styles 



Clematis in 62. Ranunculaceae 



17. Sepals not as above; corolla present; stamens few; plants 

 not climbing. 



18. Flowers blue or white; fruit a capsule. 



19. Corolla regular; stamens 5 



1 32. Hydrophyllaceae 



19. Corolla 2-lipped; stamens 4 



137. Scrophulariaceae 



18. Flowers yellow or pink. 



20. Flowers yellow; stamens 10; fruit 5-angled, spiny.... 



Trihulus in 90. ZvGOPHYLLACEAE 



20. Flowers pink; stamens 3; fruit 1 -seeded 



147. Valerian ACEAE 



16. Leaves palmately lobed, or digitate, or trifoliolate ; petals none; 

 fruit an achene. 

 21. Flowers small, green, unisexual; leaves digitately divided 



into 5-11 serrate, acuminate divisions 



45. Cannabinaceae 



21. Flowers not green; sepals petal-like 62. Ranunculaceae 



15. Leaves alternate. 



22. Stems climbing; flowers purple (or white) ; leaves ovate or has- 

 tate, often 3-lobed or 3-divided 



Solanum dulcamara in 136. SoLANACEAE 



22. Stems not climbing. 



23. Corolla of united petals, blue or white; leaves pinnate or 

 pinnately lobed; fruit a capsule. 

 24. Leaflets entire; style 1 131. POLEMONIACEAE 



24. Leaflets toothed or lobed; styles 2, or style 2-cleft 



132. Hydrophyllaceae 



23. Corolla of separate or nearly separate petals, or petals none. 



25. Corolla irregular, yellow or pink, 1 -spurred; leaflets finely 



dissected; plants glabrous 70. Fumariaceae 



25. Corolla regular, or somewhat irregular, or absent, not 

 sf)urred. 

 26. Leaflets 3, obcordate, otherwise entire; flowers yel- 

 low; fruit a capsule 86. OxALIDACEAE 



26. Leaflets not obcordate. 

 27. Leaves with stipules. 



28. Flowers small, pink; plants annual, pubescent; 



leaves pinnate, the leaflets incised 



lirodiurn in 85. GlRANIACEAE 



28. Flowers yellow, white, or purple. 



29. Lcailets entire; fruit a legume 



84. Lecuminosae 



29. Leaflets toothed or lobed; fruit not a 

 legume. 



