Jones: Flora of Illinois 25 



23. Twining shrubs; upper leaves connate-perfoliate ; flowers per- 

 fect; corolla irregular, sympetalous, the 5 stamens mserted on 



its tube; ovary inferior; fruit a few-seeded berry 



Lonicera in 146. Caprifoliaceae 



23. Erect shrubs or small trees. 



24. Leaves slightly crenate near the middle, lanceolate, acuminate 

 at each end; flowers dioecious or polygamous, apetalous, or 

 petals small and deciduous; stamens 2-4; drupe with 1, or 



rarely 2 seeds Foresliera in 125. Oleaceae 



24. Leaves entire; ovary inferior. 



25. Leaves oval, short-petioled, not acuminate; flowers in 

 axillary or terminal clusters; corolla and calyx usually 



5-lobed; stamens usually 5 146. Caprifoliaceae 



25. Leaves with petioles usually 1 cm. or more in length; calyx 

 and corolla each 4-lobed; stamens 4. 

 26. Leaves glabrous, or sparsely pubescent along the mid- 

 vein, at least the upper ones usually in whorls of 



three; flowers in globose heads 



Cephalanlhus in 146. Rubiaceae 



26. Leaves pubescent, at least on the lower surface, never 

 whorled; flowers in cymes 117. CoRNACEAE 



Section 13. Trees or Shrubs With Alternate, Compound Leaves 



, Leaves once compound, i.e., not decompound. 

 2. Leaflets 3. 



3. Prickles present. 



4. Stipules adnate to the petioles; flowers rose; carpels enclosed in a hypanthium 



("hip") which becomes red and succulent in fruit; achenes bony 



Rosa in 83. Rosaceae 



4. Stipules not adnate to the petioles; flowers white; fruit of several or many 



fleshy drupelets inserted on a convex receptacle Rubus in 83. RoSACEAE 



3. Prickles none. 



5. Leaflets silky-pubescent; stipules present; flowers yellow, perfect; achenes 



densely pubescent - Poienlilla in 83. RosACEAE 



5. Leaflets not silky-pubescent, either glabrous or only short-pubescent; stipules 

 absent; flowers greenish, polygamous or dioecious. 

 6. Leaflets sessile, pellucid-punctate; fruit a finely pubescent, suborbicular 



samara, 1.5-3 cm. in diameter Plelea in 91. RuTACEAE 



6. Leaflets, at least the terminal one, petiolulate; fruit a drupe 



98. Anacardiaceae 



2. Leaflets more than 3. 



7. Leaves palmately compound. 



8. Stems prickly; tendrils none; stamens numerous Rubus in 83. RoSACEAE 



8. Stems not prickly; tendrils present; stamens 5..Parthenocissus in 103. VlTACEAE 

 7. Leaves pinnately compound. 



9. Leaflets entire or undulate, or remotely denticulate. 



10. Leaflets 3-7, silky-pubescent, revolute-margined ; flowers yellow; fruit an 



achene; shrub 30-100 cm. tall Poienlilla in 83. RosACEAE 



10. Leaflets 5-51. 



II. Leaflets with pellucid dots; flowers greenish yellow in small axillary 

 cymes, appearing before the leaves; branches often with sharp stout 

 stipular prickles; fruit ellipsoid, 4-6 mm. long, 1 -seeded, spicy 



flavored Zanlhoxylum in 91. RuTACEAE 



11. Leaflets without pellucid dots. 



12. Fruit a pod; flowers often papilionaceous 84. Leguminosae 



12. Fruit a drupe; flowers never papilionaceous 98. Anacardiaceae 



9. Leaflets more or less toothed. 



