32 



Key 



Page 



(1) Leaves entire or nearly 



so Allionia — 74 



(2) Leaves deeply lobed Gilia — 169 



y. Leaves with more than 1 vein at base. 



a. Flowers yellow or orange or green, 

 x. Flowers composite — See Key to 



Asteraeeae Asteraceae — 205 



y. Flowers simple, 

 m. Shrubs. 



(1) Plants parasitic on trees Phoradendron— 197 



(2) Plants not parasitic Colubrina— 131 



n. Vines Vincetoxicum — 164 



o. Plants neither shrubs nor vines. 



(1) Flowers conspicuous, showy Lantana — 180 



(2) Flowers not conspicuous. 



(m) Leaves entire Croton — 120-1 



(n) Leaves toothed Xanthium — 213 



b. Flowers white or grading into pink, 



green, purple or blue, 

 m. Shrubs. 



(1) Leaves less than 1" long • • • .Philadelphia— 90 



(2) Leaves over 1" long. 



(m) Leaves entire Cornus— 151 



(1) Terminal pair of leaves 



united at base Lonicera— 201 



(2) Terminal pair of leaves 



not united Cornus-151 



(n) Leaves toothed Eupatorium— 214 



n. Vines or stems prostrate. 



(x) Sap milky • • .Philabertella— 164 



<y) Sap not milky. 



r. Flowers composite Mikania 215 



s. Flowers simple. 



(m) Leaves broader than long Bowlesia— 153 



(n) Leaves not broader than 

 long. 



(1) Flowers tubular, 4 — 6" 



long Acleisanthes — 75 



(2) Flowers not tubular. 



(a) Flowers in heads Lippia— 179 



(b) Flowers not in heads Isnardia — 146 



o. Plants not shrubs or vines. 



