KEYS TO THE GENERA 39 



* Leaves palmately veined and lobed. ( A. ) 



A. Leaves slightly lobed (usually with notched border). Philad^l- 



phus (p. 196). 

 A. Leaves decidedly 3-lobed. Vibiirnum (p. 219). Acer (p. 103). 

 A. Leaves 5-11-lobed. Acer (p. 103). 



A. Some leaves 2- or 3-lobed, others merely notched, others vrith 

 3 blades. Forsythia (p. 274). 



* Leaves feather- veined and lobed. (B.) 



B. Leaves very large, 6 inches or more long. Hydrangea (p. 192). 

 B. Leaves 2-6 inches long, some serrate, some 3-lobed, some 3-bladed. 



Forsythia Cp. 274). 

 B. Leaves under 2J inches long, some lobed, others not. Symphori- 

 cirpos (p. 228). Syrfnga (p. 27^). 



Key 3a. Key based on flowers. 



* Flowers conspicuous either by clusters or by large individual flowers. 



(A.)- 

 A. Flowers yellow, bell-shaped, 4-lobed, in early spring. Forsythia 



(p. 274). 

 A. Flowers white to light purplish with tube and 4-lobed spreading 



border. (Persian Lilac) Syrtnga pfosica lacini^ta (p. 277). 

 A. Flowers white, small or large, or small and large in clusters, in 



spring. Vibiirnum (p. 219). 



A. Flowers pinkish white, large in elongated clusters, in summer. 

 Hydrangea (p. 192). 



* Flowers inconspicuous either in size or by dull colors. (B.) 



B. Leaves decidedly and radiately lobed ; fruit dry, 2-winged. Acer 

 (p. 103). 



B. Leaves slightly lobed; fruit 2-seeded berries. Symphoricarpos 

 (p. 228). 



Key 3b. Key based on fruit. 



* Fruit fleshy, small (or absent). (A.) 



A. Drupes red or black with flattened stones (or without fruit, all 

 flowers sterile) . Vibiirnum (p. 219). 



A. Berries white or red with 2 seeds. Symphoricarpos (p. 228). 



* Fruit dry. (B.) 



B. Frait 2-winged, 2-seeded. Acer (p. 103). 



B. Fruit elongated, 2-celled, 4-seeded. (Lilac) Syrlnga (p. 275). 

 B. Fruit many-seeded. Forsythia (p. 274). Hydrangea (p. 192). 

 Philad^Iphus (p. 196). 



Key 4. Leaves opposite, compound. 

 Key based mainly on leaves and fruit. 



