POLEMONIACEAE 95 



Leaf blades orbicular, rarely over 2.5 cm. long, scape 3-10 flowered. 



1. P. chlorantha. 

 Leaf blades oval or elliptic, 3.5-4.5 cm. long, scape 7-15 flowered. 



2. P. elliptica. 

 Raceme secund, capsule about 4 mm. in diameter. 3. P. secunda. 



1. Pirola chlorantha Sw. Green Flowered Wlntergreen. 

 On dry pine woods in the western part of the state. War Bonnet 

 Canon. 



2. Pirola elliptica Xutt. Shin-Leaf. 

 In dry pine woods in the western part of the state. Long Pine. 



3. Pirola secunda L. One-Sided Wintergreen. 

 In dry pine woods in the western part of the state. Sioux County. 



2. Pterospora. 695. 



1. Pterospora andromeda Xutt. Pine Drops. 



In the pine woods of the northwestern part of the state. Sioux County. 



3. Monotropa. 696. 



1. Monotropa uniflora L. Indian Pipe. 



Rare in dense woods along the Missouri. Washington and Cass 

 Counties. 



SUB-CLASS BICARPELLATAE. 



POLEMONIALES. 



Ovary not deeply lobed, carpels not separating into distinct nutlets 

 at maturity. 

 Ovary 2-5 celled. 

 Fruit various but neither a berry nor a large prickly capsule. 

 Twining vines. 1. Convolvulaceae. 



Herbs not twining. 



Ovary 3 celled, 1. Poiemoniaceae. 



Ovary 2 celled. 



Flowers in dense capitate clusters. 1. Poiemoniaceae. 



Flowers solitary in the axils. 2. Convolvulaceae. 



Fruit a berry or a large prickly capsule. 5. Solanaceae. 



Ovary 1-celled, styles and stigmas 2. 3. Hydrophylaceae. 



Ovary deeply 4 (or rarely 2) -lobed, carpels separating into 4 nutlets 



at maturity, 4. Boraginaceae. 



1. POLEMONIACEAE. 



Stamens inserted at very unequal heights in the corolla tube, leaves 

 entire. 

 Leaves opposite, corolla with a narrow throat, stamens included. 



1. Phlox. 



Leaves alternate, corolla with a broad throat, stamens usually ex- 



serted. 3. Collomia. 



Stamens inserted at equal or nearly equal heights in the corolla, leaves 



various, rarely entire. 



Calyx lobes not spiny tipped, 2. Gilia. 



Calyx lobes spiny tipped. 4. Navarretia. 



