DATUBA SOLANACE^a 499 



NICOTIAN A 



always entire, rarely wavy but never sinuately toothed, thickish : pedun- 

 cles 5-10 lines long, reflexed in fruit : calyx strigose-villous, rarely glabrous, 

 its lobes triangular-lanceolate : corolla dull yellow with a brownish centre, 

 about 8 lines broad : fruiting calyx rounded ovoid, not sunken at the base, 

 indistinctly 10-angled : berry yellow or greenish. On dry piairies, Idaho 

 and eastward to Illinois and the Carol inas. 



Tribe 2 Hyosciamex Endl. Gen. 664. Corolla with the limb 

 either plicate or imbricate in the bud. Stamens 5 , all perfect. Fruit 

 a 2-celled, or falsely 4-celled capsule. Seeds flattened. Embryo 

 curved: the semiterete cotyledons not broader than the radicle. 

 3 DATURA L. Gen. n. 246. 



Herbs shrubs or trees with alternate leaves and large white 

 purple or violet flowers solitary in the forks of the stem or branch- 

 es. Calyx elongated-tubular or prismatic, its apex 5-cleft or 

 spathe-like in our species circumscissile near the base. Corolla 

 funnelform the limb plaited, 5-lobed. Stamens inserted at or 

 below the middle of the corolla-tube, included or but little exsert- 

 ed: filaments filiform. Ovary 2-celled or falsely 4-celled: style fili- 

 form : stigma slightly 2-lobed. Capsule 4-valved from the top or 

 bursting irregularly. 



D. STRAMONIUM L. Sp. 179. Glabrous or the young parts sparingly 

 pubescent : stem stout, 1-5 feet high from an annual root, freely branching : 

 leaves thin ovate in outline, acute or acuminate at the. apex, mostly nar- 

 rowed at the base, 3-8 inches long, irregularly sinuate-lobed, the lobes 

 acute, on petioles 1-4 inches long : calyx prismatic, less than half the length 

 of the corolla, circumscissile near the base : corolla white 3-4 inches high, 

 the limb 1^-2 inches broad: capsule erect, thickly armed with short stout 

 prickles, the lowest ones mostly shortest. In fields and waste places, Brit. 

 Columbia to California and across the Continent. Introduced trom Asia. 



Tribe 3 Cestrinese Corolla with regular limb induplic&te-valvate 

 or induplicate-imbricate in the bud. Stamens all perfect. Fruit 

 either baccate or capsular: seeds little or not at all flattened. Embryo 

 either straight or only slightly curved, the cotyledons usually broader 

 than the radicle. 



4 NICOTIANA Tourn. L. Gen. n. 248. 



Annual or perennial herbs with large alternate leaves and rath- 

 er large white, yellow, greenish or purplish flowers in terminal, 

 often bracted racemes or panicles. Calyx tubular-campanulate 

 or ovoid, 5-cleft, persistent. Corolla funnelform or salverform, 

 plicate and somewhat imbricate in the bud, filaments filiform, 

 mostly included, inserted on the tube of the corolla : anthers ovate 

 or oblong often explanate after dehiscence. Ovary normally 2- 

 celled, with long and thick placentae bearing very numerous 

 ovules and seeds. Style slender: stigma depressed-capitate and 

 often 2-lobed. Fruit a capsule, more or less invested by the calyx, 

 septicidal and also usually loculicidal at summit, the valves or 

 teeth thus becoming twice as many as cells. Seeds very small, 

 with granulate or rugose-foveolate testa. Cotyledons little broader 

 than the radicle. Ours all annuals with white or greenish flowers. 



