38 KEYS TO THE GENERA 



P. Fruit dry and 2-wiuged like all maples. Acer tat&ricum 



(p. 105). 

 P. Fruit many-seeded short capsules in spreading calyx ; flowers 



large, white or creamy. Philad^lphus (p. 196). 

 F. Fruit drupes with flattened stones. Vibiirnum (p. 219). 

 D. Leaves more or less heart-shaped, feather- veined, not basal- 

 ribbed. (G.) 

 G. Leaves doubly notched and plaited ; fruit about 4 black bead- 

 like parts in spreading calyx remaining through the winter. 

 Rhodotypos (p. 163). 

 G. Leaves not plaited. Hydrangea (p. 192). 

 D. Leaves not heart-shaped at base. (H.) 

 H. Stem somewhat 4-sided or 4-ridged, often conspicuously so. (I.) 

 I. Flowers regular, not lopsided. (J.) 

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



Forsythia (p. 274). 

 J. Flowers pink to violet with a long tube and 4-lobed spread- 

 ing border. Biiddleia (p. 287). 

 J. Flowers broadly spreading with 4 or 5 petals; fruit bright 

 colored in fall. Eu(5nymus (p. 91). 

 I. Flowers irregular, lopsided or 2-lipped. Teticrium (p. 294). 

 Caryopteris (p. 288). 

 H. Stem not conspicuously ridged or winged. (K.) 

 K. Flowers large in large snowball-like clusters. Viburnum 



(p. 219). Hydrangea (p. 192). 

 K. Flowers small (sometimes large ones at border) in broad 



clusters. Vibiirnum (p. 219). Hydrangea (p. 192). 

 K. Flowers large with 4 rounded broadly spreading petals in a 

 large green calyx. Philad^lphus (p. 196). Rhodotypos 

 (p. 163). 

 K. Flowers funnel-form, large, ^2 inches long. ' Weigfela 



(p. 234). Abfelia (p. 237). 

 K. Flowers white or pink of 5 thick petals (or double). Deutzia 



(p. 191). 

 K. Flowers large in large clusters, usually with colored calyx. 



Clerod^ndron (p. 291). 

 K. Flowers yeUow, bell-shaped, 4-lobed, in early spring ; fruit 

 large, 1 inch long, rough, many-seeded. Forsythia (p. 274). 

 K. Flowers small ; berries small with 1-4 seeds. Callic^rpa 

 (p. 289). Rhdmnus (p. 93). 



Key 3. Leaves opposite (or whorled), simple, with a lobed border. 

 (For small-leaved plants, leaves under 1 inch long, use Key 9, p. 61.) 

 Key based on leaves. 



