16 ILLINOIS NATURAL HISTORY SURVEY MANUAL 3 



U. Stamens inserted on the margin of a disk which 

 more or less incloses the gynoecium. 

 Y. Stamens opposite, and of the same number as, 

 the petals. 



Z. Sepals evident; upright shrubs 



Rhamnaceae, p. 177 



Z. Sepals minute (or obsolete) ; vines .... 



Vitaceae, p. 184 



Y. Stamens alternate with, and of the same num- 

 ber as, the petals. 



a. Leaves compound, alternate 



Anacardiaceae, p. 153 



a. Leaves simple, or opposite if compound. 

 b. Leaves simple, alternate or opposite. 

 c. Ovule 1 in each cell of the ovary; fruit 



a drupe Aquifoliaceae, p. 161 



c. Ovules 2 or more in each cell of the 

 ovary; fruit a capsule; seed arillate. 



Celastraceae, p. 166 



b. Leaves compound, opposite. 



d. Flowers regular, leaves pinnate 



Staphyleaceae, p. 173 



d. Flowers irregular, leaves digitate 



Hippocastanaceae, p. 175 



T. Ovary inferior or partially included. 



e. Stamens more than double the number of petals. 



f. Fruit a capsule 



Philadelphus, in the Hydrangeaceae, p. 85 



f. Fruit a pome Malaceae, p. 128 



e. Stamens double the number of petals, or fewer. 



g. Styles distinct or wanting. 



h. Ovules several in each cell of the ovary. 



i. Leaves opposite; fruit a capsule 



Hydrangea, in the Hydrangeaceae, p. 85 



i. Leaves alternate; fruit a berry 



Grossulariaceae, p. 91 



h. Ovule 1 in each cell of the ovary. 



j. Styles and carpels 5 ; ovary 5-celled ; 



flowers 5-merous Araliaceae, p. 210 



j. Styles and carpels 2; ovary 2-celled ; flow- 

 ers 4-merous. 

 k. Fruit a fleshy drupe containing a 2- 



seeded stone; leaves opposite 



Cornaceae, p. 212 



k. Fruit a woody capsule; leaves alternate 



Hamamelidaceae, p. 96 



g. Styles united, 



1. Stamens 8 or 10 ; anthers opening by pores ; 



fruit a berry Vacciniaceae, p. 228 



1. Stamens 5 ; anthers opening lengthwise ; 



fruit a dry capsule Iteaceae, p. 89 



