Jones: Flora of Illinois 23 



9. Perianth 3- or 6-parted; fruit several-seeded; leaves 5-15 mm. long, 



minutely spinulose-toothed Anacharis in 21. HydrocharitACEAE 



9. Perianth none; fruit 1 -seeded. 



10. Leaves spinulose-toothed; carpel 1 1 7. NaiadacEAE 



10. Leaves entire; carpels 2-5 18. PoTAMOGETONACEAE 



2. Leaves, or most of them, deeply lobed or divided. 



II. Leaves finely dissected (or sometimes root-like), often bearing small bladders; 



flowers (in our species) yellow, bilabiate; fruit a capsule 



138. Lentibulariaceae 



II. Leaves not bladder-bearing, all or most of them finely dissected. 

 12. Flowers white or yellow, solitary. 



13. Floating leaves peltate, narrowly elliptical, 1.5-2 cm. long; submerged 

 leaves opposite or verticillate, divided; petals 3; sepals 3; carpels 3 



Cabomba in 63. Nelumbonaceae 



13. Floating leaves, if any, not peltate. 



14. Leaves alternate; petals 5; sepals 5; carpels more than 3 



Ranunculus in 62. Ranunculaceae 



14. Leaves opposite, the upper lanceolate, serrate; heads solitary, radi- 

 ate; rays 6-10, yellow; achenes 1-1.5 cm. long, with 3-6 slender 



awns Megalodonla in 152. CoMPOSlTAE 



12. Flowers small, green or whitish, not solitary. 



15. Flowers green, minute; leaves alternate or whorled. 



16. Flowers in spikes; blades of the uper leaves sometimes merely pec- 

 tinate; fruit 4-lobed 116. Haloragidaceae 



16. Flowers not in spikes; leaves all dissected into rather rigid divisions; 



fruit 1 -seeded 65. Ceratophyllaceae 



15. Flowers whitish, whorled at the nodes of the erect, hollow, inflated, 

 almost leafless flowering stem; corolla 5-lobed; sepals 5, linear; 



stamens 5, included; fruit a many-seeded capsule 



..Hotlonia in 121. PrIMULACEAE 



Section 12. Trees or Shrubs (Including Woody Climbers) 

 With Opposite or Whorled Leaves 



Leaves compound. 

 2. Leaflets 3 or 2. 



3. Stems climbing or trailing. 



4. Leaflets 2, ovate, cordate, acuminate, entire, dark green; tendrils branched; 

 cymes 2-4-flowered; corolla red, 4-5 cm. long; stamens 4; capsules linear, 

 10-20 cm. long; seeds winged, elliptical; cross-section of wood showing a 

 cross Bignonia in 1 40. BiGNONIACEAE 



4. Leaflets 3. coarsely toothed; tendrils none; flowers dioecious, white, numerous 



in panicles; stamens numerous; achenes pubescent, plumose 



Clematis in 62. RanunculacEAE 



3. Stems not climbing or trailing. 



5. Leaflets coarsely toothed; flowers greenish, dioecious; fruit a pair of samaras 



Acer negundo in 100. AcERACEAE 



5. Leaflets finely serrate; flowers whitish, perfect; fruit an inflated, 3-lobed 



capsule 99. Staphyleaceae 



2. Leaflets 5-11 (rareiy 3-5). 



6. Leaves palmately compound, the leaflets serrate, straight-veined; flowers irregular, 

 in large panicles, most of them sterile; capsule leathery, smooth or spiny, 



usually with a single large glossy seed 101. HiPPOCASTANACEAE 



6. Leaves pinnately compound. 



7. Plants climbing or trailing; leaflets 9-11, serrate, 3-6 cm. long; flowers perfect, 

 the corolla red, 5-lobed, somewhat 2-lipped, 6-9 cm. long; capsules cylin- 

 drical, 8-12 cm. long Campsis in 140. BiGNONIACEAE 



7. Erect trees or shrubs. 



