352 GENTIANACE^. (GENTIAN lAMII.Y.) 



6. DATURA, L. JA.Mi:srt)WN-\Vr,i:ii. Tiioux-Arri.E. 



Calyx tuliuliir, tLiitc or angled, S-ck-ft, si'jmrating near the base, tlic upper 

 portion (k'ridiious. Corolla fumiel-sliaped ; the limb plaited, 5-loi)ed, convolute 

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

 fectly 4-celled, 4-valved, many-seeded. — Sti'ong-scented poisonous herbs, with 

 petioled oblong or ovate mostly toothed leaves, uud large solitary tlowers in tiie 

 forks of the branches. 



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

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

 long as the 5-angled calyx; capsule erect. — Var. Tatii.a. Larger; leaves 

 often cordate ; stem and corolla purpli>li. — Waste ground, very common. 

 June - Oct. — Stem lo-3°liigli. 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, t'«rt/s. Introduced. — Stems 3° -4° high. 

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



The Petunia, Night-Bi.oomixg Jessamixe (Cestrum), and Tobacco 

 (Nicotiana), belong to this family. 



Order 101. GEIVTIANACE.^. (Gentian Family.) 



Chiefly smooth and bitter herbs, witli 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 : antliers 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. Placenta parietal. Seeds niunerous. Em- 

 bryo minute, in the axis of fleshy albumen. 



Synopsis. 



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



Bessile. 



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



ghaped, 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. BARTONI.\. Calyx and corolla 4-lobed. Stigmas sessile Leaves scale-like. 



5. OBOLAKI.\. Ciilyx 2-leaved. Corolla 4-lobcd, imbricated in the bud. 



6. FKASEKA. 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. LIMNANTUEMUM. Leaves floating, cordate. I'lowers clustered on the petiole. 



