40 



Key 



Page 



r. Leaves linear, less than 



1" long Polygala— 118 



s. Leaves over 1" long. 



1. Stems sheathed at the 



joints Persicaria— 71 



2. Stems not sheathed at 



the joints. 



(1) Leaves green, fruit 



a juicy berry Phytolacca — 73 



(2) Leaves paler, fruit 



not juicy Eriogonum — 70 



2. Petals or lobes of corolla 



usually 4. 

 r. Stamens 6. 



1. Pods less than long. 



(1) Pods scale-like, pep- 

 pery Lepidium — 84 



(2) Pods triangular Bursa— 84 



(3) Pods oblong Draba— 87 



2. Pods over 1" long Arabis — 88 



s. Stamens 8. 



(1) Flowers in a leafless 



spike or raceme Gaura — 150-1 



(2) Flowers not in a leaf- 

 less spike or raceme Hartmannia— 149 



3. Petals or lobes of corolla 



usually 5. 

 r. Sap milky. 



(1) Leaves leathery Acerates— 163 



(2) Leaves not leathery Asclepias— 162 



s. Sap not milky. 



(m) Petals distinct or near- 

 ly so. 



1. Plant thistle-like, sap 



orange-colored Argemone— 82 



2. Plants not thistle-like, 

 (a) Leaves entire or 



nearly so. 

 (r) Leaves narrow. 



(1) Petals all alike Lappula— 175 



(2) Petals not alike Calceolaria— 140 



