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2a. Corolla rotate, with spreading lobes, 2 4 cm. broad, pink 

 (5 8 dm. high; summer) Rose Pink, Sabbatia angularis. 



2b. Corolla bell-shape, each petal with a spur at the base, pur- 

 plish or white, and not over 1 cm. long (1 4 dm. high; sum- 

 mer) Spurred Gentian, Halenia deflexa. 



2c. Corolla bell-shape, tubular, funnel-form, or salver-form, not 

 spurred 3. 



3a. Corolla-lobes fringed (flowers bright-blue) (Fringed Gentian) 4. 

 3b. Corolla-lobes entire 5. 



4a. Leaves lanceolate (2 8 dm. high; autumn) 



Fringed Gentian, Gentiana crinita, 



4a. Leaves linear (1 4 dm. high; late summer) 



Fringed Gentian, Gentiana procera, 



5a. Corolla 2 cm. long or a iittle less 6. 



5b. Corolla 2.5 5 cm. long (late summer and autumn) (Gentian) 7. 



6a. Upper leaves linear or narrowly lanceolate (2 4 dm. high; 

 flowers pink-purple, late summer) 



Centanry, Centaiirinm umbellatum. 



6b. Upper leaves ovate, with several principal veins (1 5 dm. 

 high; flowers blue, late summer and autumn) 



Gentian, Gentiana quinquefolia. 



7a. Calyx-lobes rough or ciliate at the margin (flowers blue, or rarely 



white) 8. 

 7b. Calyx-lobes smooth (28 dm. high) 10. 



8a. Corolla-lobes spreading; leaves narrowly lanceolate, indis- 

 tinctly veined (2 5 dm. high) Gentian, Gentiana puberula. 

 8b. Corolla-lobes erect or incurved; leaves ovate to ovate- 

 lanceolate, with 3 7 principal veins (3 6 dm. high) 9. 



9a. Calyx-lobes equaling or exceeding the calyx-tube 



Gentian, Gentiana saponaria. 



9b. Calyx-lobes shorter than the calyx-tube 



Gentian, Gentiana andrewsii. 



lOa. Leaves ovate or ovate-lanceolate, somewhat cordate at base 



(flowers greenish-white or yellowish-white) 



Gentian, Gentiana flavida, 

 lOb. Leaves narrowly lanceolate or nearly linear, not cordate 



(flowers blue) Gentian, Gentiana linearis. 



