Jones : Flora of Illinois 13 



7. Flowers crowded on a cylindrical apparently lateral spadix 6-8 cm 

 long; petals 0; sepals 0: stamens 6; leaves linear; rhizomes thick, 



aromatic; plants of swampy ground Acoius in 141. Araceae 



7. Flowers not as above. 

 8. Ovary superior. 



9. Stamens 6; leaves cordate; flowers blue or white, 2-lipped; 



fruit 1-seeded 134. Pontederiaceae 



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



of 4 persistent sepals 111. Plantaginaceae 



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



140. Orchidaceae 



3. riowers not sessile in dense heads or spikes. 

 10. Scapes with more than 1 flower. 

 1 1 . Leaves terete or nearly so. 



12. Flowers green, small, numerous, in elongated, bractless, spike- 

 like racemes; perianth 6-parted 127. Juncaginaceae 



12. Flowers pink, not in racemes. 



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



with onion flavor and odor Allium in 130. Liliaceae 



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



Talinum in 25. Portulacaceae 



11. Leaves not terete. 



14. Corolla irregular, 2-lipped, often spurred; stamens 2 or 1 ; fruit 

 a capsule. 

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

 bearing 112. Lentibulariaceae 



15. Ovary inferior; leaves entire, parallel-veined 



140. Orchidaceae 



14. Corolla regular. 



16. Flowers on branches of the inflorescence in several or many 



whorls; achenes numerous, flattened; petals 3, white; 



leaves oval, cordate, hastate, or sagittate 



126. 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 136. Iridaceae 



18. Leaves not 2-ranked. 



19. Flowers 4 or fewer (except Aletris) , yellow or 

 white; leaves sometimes pubescent; ovary in- 

 ferior 135. Amarvlmdaceae 



19. Flowers numerous, or if few, orange or pink; 

 leaves glabrous; ovary superior (or y> in- 

 ferior) 130. Liliaceae 



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



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

 petals and stamens each 5 (rarely 6); calyx 5- 



lobed 97. Primulaceae 



20. Flowers in cymes, panicles or racemes. 



21. Corolla of 4 petals; sepals 4; stamens 6 



18. Cruciferae 



21. Corolla of 5 petals. 



