270 THE FLORA. 
Orper XCV.—GENTIANACEA. The Gentianworts. 
Herbs with opposite, entire, 
smooth leaves, and showy 
regular flowers ; 
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 minute. Corolla 
mostly twisted in bud....2 
§ Leaves alternate or radical. 
Corolla valvate in the bud 
wari 
2 Corolla with a glandular spot’ capsule. 7. The corolla laid open, showing the folde 
on each lobe, sometimes (2-lobed) between the proper petals, and the stamens 
with spurs....¢ attached at base. 8. Capsule cut across. 9, Seed 
2 Corolla without glandular magnified, with its large, loose testa. 
spots or spurs....3 
8 Corolla tubular, the tube longer than the limb....a 
8 Corolla deeply cleft, mostly wheel-shaped, tuhe very short....b 
a Sepals 4 or 5. Corolla fringed, or with folds between lobes. Anthers straight. 
Gentra/na. 1 
a Sepals4 or 5. Anthers spirally twisted. European Centaury. ERYTHRR’A. 
a Sepals 2, leaf-like. Cor. 4-cleft, white or purplish. Pennywort. OBoia/Rta, 
b Leaves very small or mere bracts, Fls. 4-parted. Screw-stem. Barto’nta. 
b Leafy. Fis. 5-12-parted. Anthers curved. American Centaury. SaBpa’tia, 2 
ce Corolla 4-parted, with 4 spurs beneath at base. Spurred Gentian. Hate’nia. 
ce Cor. 4-parted, without spurs, Tall, with whorled leaves, Columbo, Fra/sEra. 
d Corolla bearded inside. Leaves 3-foliate, on long stalks. 
Buck-bean. Menyan/THEs. 
d Corolla smooth inside. Leaves simple, floating. 
Floating Heart. LiMNaN’THEMUM. 
