Jones: Flora of Illinois 11 



30. Stamens and petals perigynous 



- 83. ROSACEAE 



30. Stamens and petals hypogynous, or 



flowers dioecious 



62. Ranunculaceae 



27. Leaves without stipules. 



31. Petals and sepals each 3; flowers very small, 

 axillary; annual plants with pinnate leaves.. 



89. Limnanthaceae 



31. Petals and sepals 4 or more, or absent; or the 



sepals united, sometimes only 2. 



32. Sepals 2, caducous (falling as the flower 



opens) ; plants with milky or yellowish 



juice; stamens numerous, hypogynous; 



fruit a capsule 69. Papaveraceae 



32. Sepals 4 or 5 ; plants with watery juice. 

 33. Petals and sepals each 4; fruit a pod. 

 34. Leaves trifoliolate ; stamens 6 or 



more, exserted 



72. Capparidaceae 



34. Leaves not trifoliolate; stamens 6, 



four long and two short 



71. Cruciferae 



33. Petals 5 or none; sepals usually 5, 

 sometimes 4; fruit an achene or fol- 

 licle, or rarely a berry. 



35. Stamens and petals hypogynous, or 



flowers unisexual; sepals free -... 



62. Ranu.nculaceae 



35. Stamens and petals perigynous; 



sepals united at base 



83. Rosaceae 



Section 3. Herbs Without Leafy Stems; Leaves Simple 



1. Leaves either pitcher-like or covered with glandular appendages; petals 5; fruit a 

 capsule; insectivorous plants growing \n bogs. 

 2. Leaves large, pitcher-like; flower solitary, nodding 73. Sarraceniaceae 



2. Leaves small, covered with glandular appendages; flowers in a raceme 



- 74. Droseraceae 



1 . Leaves not as above; plants not insectivorous. 



3. Flowers sessile in dense heads, or in spikes. 

 4. Flowers in heads. 



5. Leaves net-veined, or apparently 1 -veined; flower-heads surrounded by an 

 involucre of bracts; stamens 5, inserted on the corolla, their anthers united 



in a tube; ovary inferior; fruit an achene 152. CoMPOSlTAE 



5. Leaves parallel-veined or somewhat translucent and showing many cross-veins. 

 6. Leaves subulate, soft, translucent, loosely cellular, round in cross-section; 



flowers whitish, monoecious; capsule 2-3-seeded 26. Eriocaulaceae 



6. Leaves grass-like, stifl", flat, linear, twisted; flowers yellow, perfect; capsule 



many-seeded 27. Xyridaceae 



4. Flowers in spikes (or on a spadix). 



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 Aconis in 24. Araceae 



7. Flowers not as above. 

 8. Ovary superior. 



9. Stamens 6; leaves cordate; flowers blue or white, 2-lipped; fruit 1 -seeded 

 29. Pontederiaceae 



