Jones: Flora of Illinois 27 



13. Leaves somewhat palmately veined with 3 principal veins from near 

 the base, often with one or more lateral lobes; leaves and bark spicy- 

 aromatic Sassafras in 68. Lauraceae 



13. Leaves pinnately veined or 1 -veined. 



14. Pith of the twigs chambered, or divided by woody plates; trees with 



imperfect flowers. 



15. Leaves crowded towards the ends of the branches; twigs soon 



glabrous; drupe ovoid or ellipsoid, 1 -seeded; flowers 5-merous 



Nyssa in 117. CoRNACEAE 



15. Leaves not crowded; young twigs pubescent; berry large, glo- 



bose, 4-12-seeded, reddish yellow and sweet when ripe, 



astringent when green 123. EbENACEAE 



14. Pith continuous; flowers perfect. 



16. Leaves large, 15-40 cm. long at maturity, oblanceolate ; buds 



naked, reddish-pubescent; flowers axillary, dark purple or 

 green, 2-4 cm. in diameter; sepals 3; petals 6; stamens nu- 

 merous, in a globose mass surrounding the pistils 



61 . Annonaceae 



16. Leaves smaller. 



17. Leaves evergreen 120. ERICACEAE 



1 7. Leaves deciduous. 



18. Base of petiole hollow, covering the lateral buds; termi- 

 nal bud absent; leaves oval; bark tough and fibrous; 

 flowers pale yellow, appearing before the leaves; fruit 



an ellipsoid drupe DiVca in 111. ThymeleACEAE 



18. Petioles otherwise; terminal bud present. 



19. Leaves glabrous or more or less pubescent, but not 

 strigilose beneath. 

 20. Leaves minutely resinous-dotted beneath, elliptical- 

 obovate, ciliolate; flowers in axillary drooping 

 racemes; corolla ellipsoid, greenish or pink.... 



Caplussacia in 120. ERICACEAE 



20. Leaves not resinous-dotted. 



21. Petioles usually 1 cm. or more in length; 

 ovary superior. 

 22. Bark spicy-aromatic; buds scaly; drupe 



red, 1 cm. long at maturity 



— Lindera in 68. Lauraceae 



22. Bark not aromatic; winter-buds naked; 

 drupe 6-8 mm. in diameter, dark purple 



when ripe 



Rhamnus in 102. Rhamnaceae 



21. Petioles shorter; buds scaly; ovary inferior; 



fruit a several-seeded berry 



Vaccinium in 120. ERICACEAE 



19. Leaves strigilose and pale green beneath; lateral 

 veins running parallel to the margins, the upper 

 ones ending in the apex; petals 4; sepals 4; sta- 

 mens 4; flowers white, cymose ; fruit a bluish black 



drupe 6-8 mm. in diameter 



Cornits aUemifoIia in 117. CoRNACEAE 



Section 15. Trees and Shrubs With Alternate, Simple, Lobed Leaves 



1. Leaves palmately veined and lobed. 



2. Plants climbing by tendrils 103. VlTACEAE 



2. Plants not climbing; tendrils none. 



3. Some of the leaves usually 3-lobed, not serrate, aromatic 



Sassafras in 68. Lauraceae 



