110 Order POLEMONIALES 
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. Onosmodium. 
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. Heliotropium convolvyulaceum (Nutt.) A. Gray. 
Euploca convolvulacea Nutt. 
Western Nebraska, according to Britton’s Manual. 
2. Cynoglossum. 768. 
1. Cynoglossum officinale L. Hounds-tongue. 
Introduced in the eastern part of the state. Homesville; Weeping 
Water. 
3. Lappula. 768. 
Inflorescense leafy-bracted nearly or quite to the top. 
Marginal prickles not united by their bases. 
Prickles numerous, in two rows on the margins. 1. L. lappula. 
Prickles 7-11, not in double rows. 3. L. occidentalis. 
Marginal prickles united by their bases into a distinct cup in at 
least 3 of the nutlets. 2. L. texama 
Inflorescense leafy-bracted only at the base, bracts minute above. 
Marginal prickles distinct to the base or nearly so; fruiting pedi- 
cels deflexed. 
Lower leaves over 25 mm. wide, the basal cordate; corolla 2 
mm. wide. 4. L. virginiana. 
Lower leaves less than 20 mm. wide. 
Flowers over 6 mm. wide; fruit 6 mm. broad. 6. L. floribunda. 
Flowers less than 4 mm. broad; fruit 4 mm. broad. 
5. L. deflexa. 
Marginal prickles united for % to % of their length. 
7. L. seaberrima. 
1. Lappula lappula (L.) Karst. Stickseed. 
A common weed locally in the eastern part of the state. Lincoln; St. 
James; Wahoo. 
