352 GENTIANACE^. (GENTIAN FAMILY.) 



6. DATURA, L. Jamestown-Weed. Thorn-Apple. 



Calyx tubular, tcrcre or an<,'k'(l, 5-clcft, separating near the base, the upper 

 portion (tccicluous. Corolla funnel-shaped ; the limb plaited, 5-lobe(l, convolute 

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

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

 pctioled 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 siiarply 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 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, Cwr<iS. Introduced. — Stems 3° - 4° high. 

 Xrcaves C - 8' long, Corolla 6' long. 



The Petuxia, Night-Blooming Jes.samine (Cestrum), and Tobacco 

 (Nicotiana), belong to this family. 



Order 101. GENTIANACE.li]. (Gentian Family.) 



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

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

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

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

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

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

 cellcd, or imperfectly 2-4-cellcd by the introversion of the margins of the. 

 valves, septicidally 2-valved. Placentaj parietal. Seeds uumerous. Em- 

 bryo minute, in the axis of fleshy albumen. 



Synopsis. 



• Corolla convolute, or (in Obolaria) imbricatod in the bud. Testa mcmbranaceou.s. — Leaves 



sessile. 



1. SAHBATIA. Stylo conspicuous, deciduous. Stigmas linear, twi.stcd. OoroUa whocl- 



Bhapud, 5-12-partcd. 



2. EUSTOMA. Stjlo conspicuous, persistent. Stigina.s roundish, flat. Corolla tubular, 4- 



6-parteJ. 



3. OENTIANA. Stigmas sessile, flat, persistent. Corolla bell-shaprd or funnel-form, 4 - 6- 



lobed, mostly with plaited appendages between the lobes. 



4. RAItTONIA. Calyx and corolla 4-lobed. Stigmas sessile I.cnves sralo-likc. 



5. OI!OL.\ltI.\. Calyx 2-leaved. Corolla 4-lobed, imbricated in the bud. 



C. FI{.\SRr.A. Corolla wheel-shaped, 4-parted, the lobes with a largo deprc.«sod gland In the 

 middle. 



• • Corolla folded In the hud. Testn woody. Petioles plonpn ted. 

 7. LIMNANTUKML'M. Luuve^ lloutiiig, uurdato. X''luwurs (;lu^terud ou lliu pLtlolo 



