384 



THE FLORA. 



Order XCY.— GENTIAN ACE^. The Gentianworts. 



Herbs with opposite, entire, 

 smooth leaves^ and showy 

 regular floicers ; 



corolla usually twisted in the 

 bud, with as many lobes as 



stamens^ and alternate with 

 them, mostly persistent 

 and withering; 



stigmas 1 or 2 ; 



ovary 1 -celled, superior, be- 

 coming a 2-valved 



pod with many seeds. 



Analysis of the Genera. 



§ Leaves opposite or whorled, 



sometimes miunte. Corolla 



mostly twisted in bud 2 



§ Leaves alternate or radical. 



Corolla valvate in the bud 



2 Corolla with a glandular spot 

 on each lobe, sometimes 



with spurs c 



2 Corolla without glandular 



spots or spurs 3 



3 Corolla tubular, the tube longer than the limb a 



3 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. European Centaury. Erythr^'a. 



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



b Leaves very small or mere bracts. Fla. 4-parted. Screw-stem. Baeto^nia. 



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



c Corolla 4-parted, with 4 spurs beneath at base. Spurred Gentian. Hale^nia. 



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



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



jBuck-bean. MENyAN''THES. 

 d Corolla smooth inside. Leaves simple, floating. 



Floating Heart. Limnan''themum. 



Fig. 615. 

 capsule. 7. 



Gentiana 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. 



