352 dENTIANACE^E. (GENTIAN FAMILY.) 



6. DATURA, L. JAMESTOWN-WEED. THORN-APPLE. 



Calyx tubular, terete or angled, 5-cleft, separating near the base, the upper 

 portion deciduous. Corolla funnel-shaped ; the limb plaited, 5-lobed, convolute 

 in the bud. Stamens 5 . anthers opening lengthwise. Capsule spiny, imper- 

 fectly 4-celled, 4-valved, many-seeded* Strong-scented poisonous herbs, with 

 petioled oblong or ovate mostly toothed leaves, and large solitary flowers in the 

 forks of the branches. 



1 . D. Stramonium, L. Smooth ; stem stout, forking ; leaves ovate or 

 oblong-ovate, acute, sinuate-toothed ; corolla sharply 5-toothed, white, twice as 

 long as the 5-angled calyx; capsule erect. Var. TATULA. Larger; leaves 

 often cordate ; stem and corolla purplish. Waste ground, very common. 

 June - Oct. Stem 1 - 3 high. Leaves 4' - 8' long. Corolla 3' - 4' long. 



2. D. Metel, L. Pubescent ; stem stout, branching ; leaves ovate, entire 

 or slightly toothed; corolla white, 10-toothed; calyx loose, terete; capsule nod- 

 ding. North and South Carolina, Curtis. Introduced. Stems 3 - 4 high. 

 Leaves 6' - 8' long, Corolla 6' long. 



The PETUNIA, NIGHT-BLOOMING JESSAMINE (CESTRUM), and TOBACCO 

 (NICOTIANA), belong to this family. 



ORDER 101. GENTIANACE^. (GENTIAN FAMILY.) 



Chiefly smooth, and bitter herbs, with, colorless juice, opposite entire 

 partly sheathing exstipulate leaves, and regular often showy flowers. 

 Calyx 4-1 2-parted, or 4 - 1 2-cleft. Corolla 4-1 2-lobed, convolute, rarely 

 valvate or imbricated, in the bud, hypogynous. Stamens alternate with 

 the lobes of the corolla, and inserted on its tube : anthers 2-celled. Ovary 

 single, with numerous anatropous ovules. Stigmas 1-2. Capsule 1- 

 celled, or imperfectly 2 -4-celled by the introversion of the margins of the 

 valves, septicidally 2-valved. PlacentaB parietal. Seeds numerous. Em- 

 bryo minute, in the axis of fleshy albumen. 



Synopsis. 



* Corolla convolute, or (in Obolaria) imbricated in the bud. Testa membranaceous. Leaves 



sessile. 



1. SABBATIA. Style conspicuous, deciduous. Stigmas linear, twisted. Corolla wheel- 



Bhaped, 5-12-parted. 



2. EUSTOMA. Style conspicuous, persistent. Stigmas roundish, flat. Corolla tubular, 4- 



5-parted. 



3. GENTIANA. Stigmas sessile, flat, persistent. Corolla bell-shaped or funnel-form, 4-6- 



lobed, mostly with plaited appendages between the lobes. 



4. BARTONIA. Calyx and corolla 4-lobed. Stigmas sessile. Leaves scale-like. 



5. OBOLARIA. Calyx 2-leaved. Corolla 4-lobed, imbricated in the bud. 



6. FRASERA. Corolla wheel-shaped, 4-parted, the lobes with a large depressed gknd in the 



middle. 



* * Corolla folded in the bud. Testa woody. Petioles elongated. 



7. LIMNANTHEMUM. Leaves floating, cordate. Flowers clustered on the petiole. 



