KEYS TO THE GENERA 



F. Fruit dry and 2-wiuged like all maples. Acer tataricum 



(p. 105). 

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



large, white or creamy. Philadelphus (p. 196). 

 F. Fruit drupes with flattened stones. Viburnum (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. 16:>). 



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. Buddleia (p. 287). 

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



colored in fall. Eu6nymus (p. 91). 

 I. Flowers irregular, lopsided or 2-lipped. Teucrium (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. Viburnum (p. 219). Hydrangea (p. 192). 

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

 large green calyx. Philad^lphus (p. 190). Rhodotypos 

 (p. 163). 

 K. Flowers funnel-form, large, i-2 inches long. Weigela 



(p. 234). Abelia (p. 237). 

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



(p. 191). 

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



Clerode'ndron (p. 291). 



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

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

 K. Mowers small; berries small with 1-4 seeds. Callicarpa 

 (p. 289). Rharnnus (p. 9:!). 



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

 ('For small-leaved plants, leaves under 1 inch long, use Key 9, p. 51.) 

 Key based on leaves. 



