352 GENTIANACE^. (GENTIAN FAMILY.) 



6. DATURA, L. Jamestown-Weed. Thoen-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-toothcd, 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 l°-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, C?«-t/s. 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. GENTIANACEiE. (Gentian Family.) 



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

 partly sheathing exstipulate leaves, and regular often showy flowers. — 

 Calyx 4-1 2-25arted, or 4 - 1 2-cleft. Corolla 4-1 2-lobed, convolute, rarely 

 valvate or imbricated, ija the bud, h}'pogynous. 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. Placentas 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- 



shaped, 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, 4-5- 



lobed, mostly with plaited appendages between the lobes. 



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



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



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



middle. 



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

 T. LIMNANTHEMUM. Leaves floating, cordate, flowers clustered on the petiole 



