BORAGIXACEAE 103 



7. Mertensia. 771. 



Flowers about 2.5 cm. long, corolla limb barely 5-lobed. 



1, M. virginica. 

 Flowers less than 1.5 cm. long, corolla manifestly 5-lobed. 



Pedicels distinctly hirsute. 2. M. paniculata. 



Pedicels glabrous or glandular. 



Upper surface of the leaves short-pubescent. 3. M. lanceolata. 

 Upper surface of the leaves not hairy. 4. M. linearis. 



1. Mertensia virginica (L.) DC. 

 Rare in shady woods. Culbertson. 



2. Mertensia paniculata (Ait.) Don. 

 Reported from Sheridan County. 



3. Mertensia lanceolata DC. 

 Woods in War Bonnet Canon. 



4. Mertensia linearis Greene. 



Nebraska according Rydberg's Flora of Colorado. 



8. Lithospermum. 773. 



Corolla lobes entire, the tube not more than twice as long as the calyx. 

 Flowers white, 6 mm. long, nutlets wrinkled or pitted, 2 mm. long. 



1. L. arvense. 



Flowers yellow, 1 cm. or more long, nutlets smooth, white, 4 mm. 



long. 



Flowers peduncled, corolla tube bearded at the base inside, calyx 



3-4 times as long as the nutlets. 2. L. gmelini. 



Flowers sessile, corolla tube not bearded at the base inside, calyx 



twice as long as the nutlets. 3. L. canescens. 



Corolla lobes erose-dentate, the tube 2-4 times as long as the calyx. 



4. L. linearifolia. 



1. Lithospermum arvense L. 



Sparingly introduced, mostly in the eastern part of the state. Lin- 

 coln; Long Pine; St. Paul. 



2. Lithospermum gmelini (Michx.) A. S. Hitchcock. 



Common in prairies over most of the state. Anselmo; Antelope 

 County; Fremont; Grand Island; Sheridan County; Thedford; Wei- 

 gand. 



3. Lithospermum canescens (Michx.) Lehm. 



Low prairies in the eastern part of the state. Emerson; Lincoln; 

 Plainview; Walton; Weeping Water. 



4. Lithospermum linearifolium Goldie. 

 Lithospermum angustifolium Michx. 



Common on plains and low prairies all over the state. Anselmo; 

 Box Butte County; Fairbury; Lincoln; Perkins County; Pine Ridge; 

 Thedford. 



9. Onosmodium. 774. 



Plants 4-6 dm. tall; leaves 4-8 cm. long, less than 1.8 cm. wide, nutlets 

 not constricted at the base. 1. O. occidentale. 



Plants 10-12 dm. tall; leaves 8-10 cm, long, over 1.8 cm. wide, nutlets 

 with a neck or constriction at the base. 2. O. hispidissimum. 



