Okdeb 95.— the GENTIANWORTS. 271 



1. GENTIA'NA. Gentian. 



Oalyx 4r-5-cleft. Corolla 4r-5-loheA, regular, usually with plaited folds 

 between tlie lobes. Stigmas 2, style sbort or none. Pod oblong, 2-valved, 

 many-seeded. — ^Leaves opposite. Rowers solitary or in cymes. Aug.-Oet. 



§ Corolla with folded appendages between the 5 lobes. Anthers cohering. . . .b 

 Corolla with no appendages between the lobes. Anthers separate. . . la 



a Segments of the corolla entire, pale- blue, 5 in number 1 



a Segments of the corolla fringed, mostly but 4, bright blue .... 2, 3 , 



b Flowers solitary, terminal, blue or white 4 



b Flowers clustered, yellowish or cream-white. . . .5, 6 • 



b Flowers clustered, blue 7-9 * 



1 Gr. quinqueflo'ra. Five-leaved G. Clusters about 5-ilowered. Corolla lobes bristle- 

 pointed. 

 2 Gr. orini'ta. Fringed &. Leaves lanceolate. Corolla conspicuously fringed. 



Height If. 

 8 Gr. det'onsa. Shorn G. Lvs. linear. Corolla lobes crenato-ciliate. Height If. 

 4 Gr.angustifo'lia. Sand G. Slender, If. erect. Lvs. linear. Flower large. S. or^. 



5 Gr. oohioleu'oa. Pale G. Lvs. lance-oval, narrowed to the sessile base. Corolla 



greenish-white, a third longer than the sepals. S. M. 



6 Gr. alba. Whitish G. Lvs. lanoe-ovate, clasping with the broad base. Corolla 



cream-white, 4 times longer than sepals. W. M. 

 7 Gr. Andrew'sii. Closed Blue G. Leaves ovate -lanceolate, S-veined. Corolla never 



opening, the lobes equalling the 5»fringed folds. (Figs. 615-619.) 

 % Gr. Sapona'ria. Soapwort G. Plant smooth. . Leaves rough-edged, linear-lanceo- 

 late. Corolla open, the lobes twice longer than the cleft folds. 

 9 O. puber'ula. Bovigh G. Plant scabrous. Lvs. lanoe-ovate, very rough at edge. 

 Corolla somewhat bell-shaped, folds very short. "W. S. 



2. SABBA'TIA. American Centaury. 



Calyx 5-12-parted. Corolla rotate, limb 6-12-parted. Stamens 5-12. 

 Style 2-parted. Capsule 1-oelled. — Beautiful biennials, with mostly ro- 

 seate flowers. 



§ Corolla mostly 9 (rarely 7-12)-parted 1, 2 



§ Corolla 5 (rarely 6)-parted a 



it Branches alternate or forked b 



a Branches opposite. • Flowers with a central star. . . .u 



b Flowers white or nearly jvhite 3,4 



b Flowers rose-red, with a central star. . . .5, 6 



o Flowers white, oorymbed 7, 8 



c Flowers rose-red, paniculate. . . .9, 10 



