12 American Midland Naturalist Monograph No. 2 



9. Stamens 4, or rarely 2; flowers greenish; corolla 4-lobed; calyx of 4 



persistent sepals 144. Plantaginaceae 



8. Ovary inferior; flowers irregular; stamens 1 or 2 36. Orchidaceae 



3. Flowers not sessile in dense heads or spikes. 

 10. Scapes with more than 1 flower. 

 I 1. Leaves terete or nearly so. 



12. Flowers green, small, numerous, in elcngatcd, bractless, spike-like ra- 

 cemes; perianth 6-parted 19. Juncaginaceae 



12. Flowers pink, not in racemes. 



13. Flowers in umbels; perianth 6-parted; stamens 6; plants with onion 



flavor and odor Allium in 31. LlLIACEAE 



13. Flowers in cymes; petals 5; sepals 2; plants inodorous 



Talinum in 57. PoRTULACACEAE 



1 1 . Leaves not terete. 



14. Corolla irregular, 2-lipped, often spurred; stamens 2 or I ; fruit a cap- 

 sule. 



15. Ovary superior; leaves absent, or dissected and bladder-bearing 



1 38. Lentibulariaceae 



15. Ovary inferior; leaves entire, parallel-veined 36. OrchidacEAE 



14. Corolla regular. 



16. Flowers or branches of the inflorescence in several or many whorls; 



achenes numerous, flattened; petals 3, white; leaves oval, cordate, 



hastate, or sagittate 20. Alismaceae 



16. Flowers not whorled; fruit a capsule. 



17. Leaves evidently parallel-veined, narrow; petals 3, or perianth 6- 

 parted. 

 18. Leaves 2-ranked (equitant) ; flowers usually blue, sometimes 

 white, rarely reddish brown; stamens 3; ovary inferior.... 



34. Iridaceae 



18. Leaves not 2-ranked. 



19. Flowers 4 or fewer, yellow or \\hite ; leaves sometimes 



pubescent; ovary inferior 33. Amaryllidaceae 



19. Flowers numerous, or if few, orange or pink; leaves gla- 

 brous; ovary superior (or ^/i inferior) 



3 1 . LlLIACEAE 



17. Leaves nel-veined ; petals 5 or 4. 



20. Flowers in an umbel, or 1-3 on slender pedicels; petals 5; 



stamens 5; calyx 5-lobed 121. Primulaceae 



20. Flowers in cymes, panicles or racemes. 



21. Corolla of 4 petals; sepals 4; stamens 6....7I. Cruciferae 

 21. Corolla of 5 petals; sepals 5. 



22. Styles 2; anthers opening longitudinally; leaves not 



evergreen; fruit 1-loculed 77. Saxifragaceae 



22. Style 1; anthers opening by terminal pores; leaves 

 evergreen; fruit a 5-loculed capsule . . 120. ERICACEAE 

 10. Scapes 1 -flowered. 



23. Leaves toothed or lobed; petals separate, or absent. 



24. Fruit an achene ; flowers yellow, bluish or white; petals sometimes 

 absent, the sepals then petal-like; juice watery. ...62. RaNUNCUI.ACEAE 

 24. Fruit a capsule; leaves toothed or with toothed lobes; petals present. 

 25. Plants with red juice; leaves thickish; petals 4-15 (usually 8), white; 



flowers regular; capsule acute Sanguinaria in 69. Papaveraceae 



25. r^lants with colorless juice; leaves thin; petals 5; flowers irregular, 



blue, yellow, or white; capsule obtuse 108. VlOLACEAE 



23. Leaves entire. 



26. Leaves reniform, cordate, or ovate; fruit a capsule. 



27. Leaves pubescent beneath, reniform; flowers brownish purple; calyx 

 3-lobed; petals none; stamens 12; ovary inferior; woodland 

 plants Asarum in 49. Aristolochiaceae 



