KEY 15 



B. Leaves Opposite page 



C. FLOWERS OF SEPARATE PETALS 



Petals 4, stamens 4. Ludwigiantha 160 



Petals 4 or 5, stamens many Hypericaceae 142 



C. FLOWERS OF MORE OR LESS UNITED PETALS 



Flowers in heads Compositae 228 



Flowers not in heads Scrophulariaceae 199 



B. Leaves Alternate, Compound 



Flowers irregular, pea-shaped, f r. a legume 



Leguminosae 104 



Flowers nearly regular, fr. a legume Cassiaceae 99 



Flowers regular, fr. a capsule. Plant acid . . . . Oxalis 119 



B. Leaves Alternate, Toothed or Lobed 



C. FLOWERS of separate PETALS 



Petals 4, stamens 4 or 8 Onagraceae 158 



Petals 4, stamens 6 Crucif erae 85 



Petals 5, stamens many, sap yellow. . . Argemone 84 



Petals 5, stamens many, sap not yellow 



Mentzelia 149 



Petals 5, stamens 10 Triumfetta 137 



Petals 5, stamens 5, fls. clustered. .. .Waltheria 142 



Petals 5, stamens 5, fls. not clustered. .Piriqueta 144 



C. flowers of more or less united PETALS 



Flowers 5-lobed. Vines Cucurbitaceae 218 



Flowers 5-lobed. Not vines Malvaceae 138 



Flowers bell-shaped Physalis 187 



Flowers tubular or strap-shaped, in heads 



Compositae 228 

 B. Leaves Alternate, Entire 



C. flowers of separate petals 



Petals 3, fls. irregular Orchidaceae 53 



Petals 3, fls. regular Gyrotheca 51 



Petals 4 Onagraceae 158 



Petals 5, fls. irregular Leguminosae 104 



Petals 5, fls. regular, stamens many 



Helianthemum 144 



Petals 5, fls. regular, stamens 5 . . Cathartolinum 118 



C. flowers of more or less united petals 



Flowers large, few, petals 3 Canna 51 



Flowers small, many, petals ^3 Polygala 122 



Flowers 5-lobed, in umbels Asclepiadaceae 177 



Flowers 5-lobed, in racemes Heliotropium 189 



Flowers tubular or strap-shaped, in heads 



Compositae 228 



