SHRUBS, 
. Twigs very slender. Caryopteris. 
Twigs stouter. 210, 
. Twigs 4-sided or winged. Buddleia. 
Twigs 2-lined. Diervilla. 
. Leaf-scars raised: bundle-traces 9. Clerodendron. 
Leaf-scars not raised: bundle-traces 3 or 5. Hydrangea. 
. With a few or coarse branches, Hydrangea. 
Bushy or with slender branches. 213. 
. Leaf-scars ciliate: buds often several. Rhodotypos. 
Leaf-scars not ciliate, or else buds solitary.. 214. 
. Bundle-traces 3 or more. 215. 
Bundle trace one. 217. 
. Leaves with some simple appressed hairs. Hydrangea. 
Leaves and twigs with some small stellate hairs. Deutzia. 
Without such hairs. 216. 
Leaves woolly beneath: bark quickly peeling. Jamesia. 
Leaves not woolly. Viburnum. 
. Buds solitary: pith often spongy, Evonymus. 
Buds superposed. Forestiera. 
Lobed. 
With nectar-glands on the petiole. Viburnum. 
Without nectar-glands. 210. 
. Leaves very large, cordate: typically a tree. Paulownia, 
Leaves not very large. 220. 
. Pith chambered or excavated. 221. 
Pith continuous. 222. 
. Buds clustered: pith chambered. Forsythia. 
Buds solitary: pith excavated. Symphoricarpos. 
. Bundle traces 3. 223. 
Bundle traces 5-7: twigs rather stout. Hydrangea. 
. Leaves pinnately lobed: twigs slender. Syringa. 
Leaves palmately lobed. 224. 
. Buds stalked, or with 2 evident scales. Acer. 
Buds sessile, with 4 or more scales. 225, 
. Bud-scales 6 or 8. Acer. 
Bud-scales 4, Viburnum, 
