Jones: Flora of Illinois 13 



27. Leaves glabrous; flowers blue or wbile. 



28. Petals, sepals, stamens eacb 5; staminodia pt'esent ; stigmas 4; 



plants of bogs and springy places 76. Parnassiaceae 



28. Perianth 6-parted; staminodia none; stamens 3; stigmas 3; plants 



of muddy shores Heleranthera in 29. PoNTEDERIACEAE 



26. Leaves not as above. 



29. Flowers on a spadix surrounded by a spathe; fruit a berry 



24. Araceae 



29. Flowers not on a spadix; spathe none; fruit not a berry. 



30. Leaves orbicular, peltate; flowers 10-25 cm in diameter, pale 



yellow; petals and stamens numerous 



Nelumho in 63. Nelumbonaceae 



30. Leaves not peltate; flowers smaller. 



31. Flowers irregular; ovarry inferior; stamens I or 2 



36. Orchidaceae 



31. Flowers regular. 



32. Leaves equitant ; flowers blue or white; ovary inferior; 



stamens 3 34. Iridaceae 



32. Leaves not equitant; ovary superior; stamens 6 



3 I . LlLIACEAE 



Section 4. Mostly Monocotyledonous Herbs (Except Grasses, Sedges 

 and Rushes) with Leafy Stems 



. Flowers in dense heads or spikes. 



2. Leaves cordate; flowers blue, 2-lipped; stamens 6 



- - Pontederia in 29. PoNTEDERIACEAE 



2. Leaves not cordate. 



3. Plants growing in wet places; flowers greenish. 



4. Spikes cylindrical, the upper part staminate, the lower pistillate; plants 2-3 m. 

 tall 15. Typhaceae 



4. Heads spherical; plants not so tall ...16. SparganiacEAE 



3. Plants of dry ground; flowers not green. 



5. Leaves spiny- or bnstly-margined ; plants with watery juice 



Enngium in 119. Umbzlliferae 



5. Leaves smooth-margined; plants with milky juice 



Tragopogon in 1 52. CoMPOSlTAE 



Flowers not in dense heads. 

 5. Ovary or ovaries superior. 



6. Carpels nearly separate; stamens 3 19. JuncagiNACEAE 



6. Ovary compound. 



7. Flowers irregular, blue, enclosed or subtended by a small spathe ; petals 3. 



unequal CommcUna in 28. CoMMELINACEAE 



7. Flowers regular; stamens 6. 



8. Flowers blue or purple; filaments pubescent; juice mucilaginous 



Tradescaniia in 28. CoMMELINACEAE 



8. Flowers not blue (sometimes lavender) ; filaments glabrous or nearly so.... 



3 1 . LlLIACEAE 



5. Ovary inferior, compound. 



9. Stamens 3; flowers regular; leaves equitant 34. IridacEAE 



9. Stamens 1 or 2 ; flowers irregular; leaves not equitant 36. OrchidacEAE 



Section 5. Dicotyledonous Herbs (except Trillium) With Opposite 

 or Whorled Entire Leaves 



, Flowers sessile in dense heads on a common receptacle surrounded or subtended by an 



involucre of bracts; fruit an achene. [P\}cnanihemum (Labiatae), with flowers in 



dense head-like clusters, might also be sought here]. 



2. Stem with small prickles; chaff of the receptacle (among the flowers) with long 



rigid spine-like tips; stamens 4, distinct 148. DiPSACACEAE 



