Jones: Flora of Illinois 29 



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 109. Bignoniaceae 



4. Leaflets 3, coarsely toothed; tendrils none; plants dioecious, the 



flowers white, numerous in panicles; stamens numerous; achenes 



pubescent, plumose Clematis in 3. Ranu.xculaceae 



3. Stems not climbing or trailing. 



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



samaras Acer negundo in 50. Aceraceae 



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



lobed capsule 46. Staphyleaceae 



2. Leaflets 5-11 (rarely 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 



47. 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 cylindrical, 8-12 cm long 



Campsis in 109. Bignoniaceae 



7. Erect trees or shrubs. 



8. Branches with a large pith; fruit a drupe; flowers regular, per- 

 fect, numerous, small, whitish, cymose; stamens 5; ovary 



inferior Sambucus in 120. Caprifoliaceae 



8. Branches with a small pith; fruit a samara; flowers small, green- 

 ish, unisexual, appearing before the leaves. 

 9. Leaflets 3-5 (rarely 7-9), at least some of them usually coarsely 



toothed; samaras in pairs; stamens 4-6 



Acer negundo in 50. Aceraceae 



9. Leaflets 5-11, entire to shallowly serrate; samaras single; sta- 

 mens 2 Fraxinus in 98. Oleaceae 



1 . Leaves simple. 



10. Margins toothed or lobed. 



11. Margins toothed, not lobed; shrubs. 



12. Young branchlets often somewhat quadrangular; leaves serru- 

 late; flowers perfect, axillary, greenish or purplish; petals 4-6; 

 calyx 4-5-cIeft; stamens 4-5, inserted on the disk; fruit deeply 



3-5-lobed Euonymus in 44. Celastraceae 



12. Branchlets terete or nearly so. 



13. Leaves evergreen, small, oval, crenate above the middle; 

 stems slender, trailing; flowers in pairs, nodding, pink, fra- 

 grant, about 1 cm long Linnaea in 120. Caprifoliaceae 



13. Leaves otherwise. 



14. Margins dentate or sharply serrate; ovary inferior. 



15. Principal lateral veins 1-5 pairs; corolla of 4 separate 

 petals; stamens more than 5; capsule many-seeded 

 55. Hydra ngeaceae 



15. Principal lateral veins 5-10 pairs; corolla sympetalous, 

 5-lobed or 2-lipped, the 5 stamens inserted in the 

 tube; fruit a 1 -seeded drupe or a many-seeded cap- 

 sule 120. Caprifoliaceae 



