GENTIAN FAMILY 97 



(2) Flowers bright blue; fruit scarcely stalked; 



at 10-14000 ft. G. prostrdta 



b. Plants .5-2 ft. high ; flowers large, 2-5 cm. long 



(1) Corolla greenish-yellow, purple dotted; at 



10-14000 ft. G. frigida 



(2) Corolla blue or purple 



(a) Corolla open 



x. Corolla widely open, 3-5 cm. long, 



mostly 1.5-2 cm. wide G. calycosa 



v. Corolla narrowly open, 2-3 cm. long, 1 



cm. or less wide G. dfiinis 



(b) Corolla nearly or completely closed G. Andrewsii 

 2. Corolla without lobes or folds between the main 



lobes, the latter fringed at the margin or at the 

 base 



a. Lobes fringed along the margin; flowers 1-2 



in. long 



( 1 ) Flowers on long leafless stalks ; corolla 



lobes obovoid, dark blue G. serrdta 



I Flowers on short stalks, enclosed in 2 



leaves ; corolla lobes oblong, light blue G. barbelldta 



b. Lobes usually entire at margin, but fringed at 



base ; flowers .5-2 cm. long 

 I I ) Flowers single on long slender stems bear- 

 ing a few small leaves ; rare G. tenella 



(2) Flowers usually many on short stalks from 



leafy stems ; common G. amarella 



Pleurogyne Eschscholtz 1825 

 (Gr. pleuron, side, gyne, female, from the lateral stigmas) 

 Sepals 4-5, united at the base, petals 4-5 white to blue, with a pair 

 of narrow appendages at the base of each, united into a saucer-shaped cor- 

 olla, stamens 4-5, ovary 1 -celled, style none, stigma running down the ovary, 

 capsule 2-valved ; flowers in terminal narrow racemes or panicles, or 

 solitary at the ends of the slender stalks, leaves opposite; annual. 

 Stems 4-15 in. high; leaves linear, 2-3 cm. long; flow- 

 ers 12-25 mm. wide P. rotdta 



Swertia Linne 1753 Swertia 

 (Named for Swert, a Dutch botanist) 

 PI. 18, fig. 7. 

 Sepals 4-5, united, petals 4-5, blue, purple, or white, united into a 



