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8. Polemonium. — Corolla rotate. Stigmas 

 3. Filaments inserted at equal heights 

 on the tube of the corolla, ascending; 

 anthers incumbent. 



4. Gilia. — Corolla rotate — funnel-shaped. 

 Stigmas 3. Filaments straight, inserted 

 at equal heights; anthers incumbent. 



5. Collomia. — Corolla salver-shaped. Stig- 

 mas 3. Filaments inserted at unequal 

 heights and exserted. 



6. Convolvulus. — Corolla funnel-shaped, pli- 



cate, 5-angular. Cells of ovary 2-ovu- 

 late. Calyx marcescent. 



7. Datura. — Corolla funnel-shaped, plicate, 

 5-angular. Calyx transversely decidu- 

 ous. 



8. Nicotiana. — Corolla funnel-shaped, pli- 

 cate, 5-angular. Calyx persistent. Cells 

 of ovary co-ovulate. 



9. Rhododendron. — Corolla campanulate. 

 Stamens inserted on a disc, not on the 

 corolla. Cells of the anthers opening 

 by pores. Shrubs. 



10. Pentstemon. — Corolla irregular, funnel- 

 shaped. Stamens of unequal length, 

 one of them sterile. Capsule 2-celled 

 Go-ovulate. 



