42 



Key 



Page 



racemes. 



a. Calyx bristly Cryptanthe — 175 



b. Calyx not brist- 



ly Heliotropium — 177 



2. Flowers not in 

 strongly coiled 

 racemes. 



a. Corolla lobed. 



(1) Fruit prick- 



ly Lappula — 175 



(2) Fruit not 



prickly . Heliotropium — 177 



b. Corolla not 



lobed Evolvulus — 165 



e. Flowers blue, violet or purple, 

 m. Flowers composite — See Key to 



Asteraceae Krameria— 98 



n. Flowers simple. 



(x) Stems creeping or prostrate. 



(1) Flowers reddish-purple, ir- 

 regular Petunia — 173 



(2) Flowers blue to violet, regu- 



lar Poly gala — 119 



(y) Stems not prostrate. 



(a) Flowers bonnet-shaped or 

 nearly so. 



(1) Leaves %— - long.... Meibomla— 107 



(2) Leaves over %" long 

 (Leaf is really compound) 



(b) Flowers not bonnet-shaped. 



1. Petals or lobes of corolla 3. 

 ( 1 ) Silver-grey plants grow- 

 ing in small bunches 



or trees Tillandsia — 61 



2. Petals or lobes of corolla 4. 



(1) Stamens 6, pods flat... Arabis— 88 



(2) Stamens 8, fruits not 



flat Hartmannia — 150 



3. Petals or lobes of corolla 5 



or 6. 



