28 



Key 



Page 



r. Leaves in a whorl at tip of stem Poinsettia — 125 



s. Leaves not whorled. 



(1) Fruit small, 3-lobed Chamaesyce — 124 



(2) Fruit 1 — 3" long, not lobed Asclepiodora— 163 



c. Flowers white or grading into pink, 



blue or purple, 

 m. Shrubs, 

 r. Leaves 1" or less long. 



(1) Leaves aromatic Aloysia— 179 



(2) Leaves not aromatic Prunus— 92 



s. Leaves over 1" long. 



(a) Branches spiny Bumelia— 158 



(b) Branches not spiny. 



(x) Flowers in flat-topped 

 clusters. 



(1) Petals 4, stamens 4... Cornus — 151 



(2) Corolla 5-lobed, stamens 



5 ; Viburnum— 200 



(y) Flowers not in flat-top- 

 ped clusters, 

 (m) Flowers in spherical 



heads about 1" across. Cephalanthus— 198 



( n ) Flowers not in spherical 

 heads. 



(1) Terminal pair of 



leaves united at base Lonicera— 201 



(2) Terminal pair of 



leaves not united Buddleia — 160 



n. Vines or plants with creeping or 

 prostrate stems. 



r. Leaves in whorls of 4 or 7 Galium — 199 



s. Leaves not whorled. 



(a) Flowers tubular 4 — 6" long Acleisanthes — 75 



(b) Flowers not tubular. 



(m) Flowers in compact heads Lippia — 179 



(n) Flowers not in compact 

 heads. 



(1) Corolla 4-lobed Isnardia — 146 



(2) Corolla 5-lobed Monniera— 192 



o. Plants neither shrubs nor vine- 

 like. 



m. Flowers composite — See key to 



