270 



THE PLOKA. 



Order XCV.— GENTIANACE^. The Gentianworts. 



Serbs ■with opposite, entire, 

 smoo*li leaves, and showy 

 regular flowers ; 



corolla usuaDy twisted in the 

 . bud, with as many lobes as 



sta/mens, and alternate with 

 them, mostly persistent 

 and withering; 



stigmas 1 or 2 ; 



otary 1-celled, superior, be- 

 coming a 2-valved 



pod with many seeds. 



Analysis of the Oenera. 



% Leaves opposite or whorled, 



sometimes minute. Corolla 



mostly twisted in bud. . . .2 



§ Leaves alternate or radical. 



Corolla valvate in the bud 



d 



2 Corolla with a glandular spot 

 on each lote,. sometimes 

 with spurs.... c 

 2 Corolla without glandular 



spots or spurs 3 



8 Corolla tubular, the tube longer than the limb a 



S Corolla deeply cleft, mostly wheel-shaped, tube very short b 



a Sepals 4 or 5. Corolla fringed,.or with folds between lobes. Anthers straight. 



Gentia'na. 



a Sepals 4 or 5. Anthers spirally twisted. Swopean Centaury. Erythb^'a. 



a Sepals 2, leaf -like. Cor. 4-cleft, white or purplish. Pennywort. Obola'eia. 



b Leaves very small or mere bracts. Fls. 4-parted. Screw-stem. Baeto'nia. 



b Leafy. Fls. 5-12-parted. Anthers curved. American Centaury. Saeea'tia. 



c Corolla 4-parted, with 4 spurs beneath at base. Spurred GetiJtian. Hale'nia. 



Cor. 4-parted, without spurs. Tall, with whorled leaves. Columbo. Fba'sera. 



d Corolla bearded inside. Leaves 3-foliate, on long stalks. 



Buck-hean. Mentan''thes. 

 d Corolla smooth inside. Leaves simple, floftting. • 



FloaiiThg Heart. Limnan'themxim. 



Fig. 615. 

 capsule. 7. 



G-entiaDa Andrewsii. 6. The calyx and 



The corolla laid open, showing the folds 



(2-lobed) between the proper petals, and 'the stamens 



attached at base. 8. Capsule cut across. 9. Seed 



magnified, with its large, loose testa. 



