352 GENTIANACE^. (geNTIAK FAMILY.) 



6. DATURA, L. Jamestown-Weed. Thokn-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-cclled, 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. Stramouium, 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 purplL^h. — 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, Curt/s. Introduced. — Stems 3° -4° high. 

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



The Petunia, Night-Blooming Jessamine (Cestkum), 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-ceIled by the introversion of the margins of the 

 valves, septicidally 2-valved. Placentae 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 conspicuouSj persistent. Stigmas roundish, flat. Corolla tubular, 4~ 



5-parted. 



3. GENTIAN A. 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. 

 6. OBOLARIA. Calyx 2-leaTed. 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. 



