100 POLEMOXIALES 



1. Hydrophyllum. 762. 



1. Hydrophyllum virginicum L. 



In rich woods in the eastern part of the state. Lincoln; Nebraska 



City; Ponca; Weeping Water. 



2. Macrocalyx. 763. 



1. Macrocalyx nyctelea (L.) Kimtze. 



Ellisia nyctelea L. 

 In moist shady places throughout the state. Box Butte County; Fair- 

 bury; Lincoln; Red Cloud; St. Helena; Thedford. 



3. Phacella. 764. 



1. Phacelia leucophylla Torr. 



In dry soil in the western part of the state. Harrison; Pine Ridge; 



Scotts Bluff County; Sioux County; War Bonnet Canon. 



4. BORAGINACEAE. 



Ovary not deeply 4-lobed, style terminal. 1. Heliotropium. 



Ovary deeply 4-lobed, style arising between the lobes. 

 Flowers regular. 

 Nutlets prickly. 



Nutlets spreading, extending but little above point of attach- 

 ment. 2. Cynoglossum. 

 Nutlets erect, extending far above point of attachment. 



3. Lappula. 

 Nutlets not prickly. 



Receptacle conic, nutlets laterally attached. 



Most of the leaves with axillary flowers. 4. Allocarya. 



Only the upper leaves with axillary flowers. 



Inflorescense naked or bracteolate. 5. Cryptanthe. 



Inflorescense leafy. 6. Oreocarya. 



Receptacle flat or convex. 



Inflorescense not leafy-bracted. 7. Mertensia. 



Inflorescense leafy-bracted. 



Corolla lobes rounded. 8. Lithospermum. 



Corolla lobes acute. 9. Onosmodlum. 



Flowers irregular. 10. Echium. 



1. Heliotropium. 767. 



Flowers in dense scorpioid spikes, 1. H. spathulatum. 



Flowers mostly solitary, opposite the leaves. 2. H. convolvulaceum. 



1. Heliotropium spathulatum Rydb. 

 Heliotropium curassavicum L. 



In the western part of the state. Alliance; Banner County. 



2. Helitropium convolvulaceum (Nutt.) A. Gray. 

 Euploca convolvulacea Nutt. 



Western Nebraska according to Britton's Manual. 



