NICOTIANA 



NICOTIANA 



2143 



AA. Fls. racemose or paniculate; corolla salverform; tube 

 relatively broad or swollen, usually yellow or mixed 

 with white or red; limb-segms. obtuse or acute. 

 (Nos. 10-17. Subgenus Rustica.) 



B. Plants glabrous and glaucous. 



10. glafcca, Graham (N. arborea, Dietr.). Erect, 

 tree-like, up to 20 ft. tall, glaucous-blue all over: st. 

 branching: Ivs. long-petioled, unequally subcordate- 

 ovate, acute, somewhat repand: fls. pedicelled, pedicels 

 incurved in fr., in loose, terminal, bracted panicles; 

 calyx tubular, 5-toothed, teeth acute, unequal, some- 

 what ciliate; corolla yellow, tube scarcely incurved, 

 somewhat swollen above; mouth contracted, softly 

 woolly; limb small, lobes ovate, very short, acute: caps, 

 inclosed in the calyx. Argentina, Paraguay, Bolivia. 

 B.M. 2837. G. 26 : 571. Frequently cult, for its stately 

 habit and striking glaucous-blue foliage which some- 

 times develops purplish tints. It has escaped from cult, 

 and runs wild in Texas and Calif. Usually does not 

 bloom in the northern states. Easily grown from seed. 



BB. Plants pubescent. 



c. Lvs. sessile. 

 D. Corolla not over 8 times longer than the calyx; stamens 



much exserted. 

 E. The corolla without a bright red margin. 



11. tomentdsa, Ruiz & Pay. C/V. colossea, Andre 1 ). 

 Herbaceous or woody, perennial, viscid-pubescent: st. 

 reaching 10 to 20 ft., diffusely branched from the base 

 upward: branches leafy, terete, ascending: Ivs. 10-18 

 in. long by 4-6 in. wide, obovate-oblong, acuminate, 

 narrowing into a very broad undulate, winged petiole 

 with a clasping base, pale green above, paler beneath, 

 with conspicuous midrib and veins: panicle terminal, 

 nearly a foot long and broad, branches ascending, loose- 

 fid., tubercled at the articulations of the pedicels; bracts 

 narrow, caducous; pedicels J^-^jin. long; fls. inclined, 

 \Yi in. long; calyx broadly terete, Y$n.. long, smooth, 

 green, base rounded; lobes unequal narrow, obtuse, 

 shorter than the tube; corolla slightly incurved, pale 

 green and pubescent without; tube somewhat exceed- 

 ing the calyx-lobes; lobes ovate, obtuse, spreading, 

 yellowish tinged with red within; stamens suberect, 

 twice as long as the corolla-lobes; ovary conical, 

 glabrous; style longer than the stamens, reddish; 

 stigma 2-lobed. Brazil. B.M. 7252. G.C. III. 9:83. 

 Gng. 1 : 97. A remarkably valuable plant for large 

 and rapid growth. Very useful in making subtropical 

 effects. Re-described by Andre from plants that came 

 up in soil received with Brazilian orchids which were 

 sent to France. It began to attract attention in France 

 about 1899. It usually has reddish sts. which add to 

 the bold effect. Seeds should be started under glass. 

 Var. variegata, Hort., has mottled and margined foliage. 

 R.H. 1893, p. 9. G.M. 37:61. 



EE. The corolla with a bright red margin. 



12. isodendra, Ricker (N. arborea semperflorens, 

 Ament. N. colossea variegata x N. macrophylla). A 

 tree-like perennial herb, viscid-pubescent throughout: 

 st. erect, 6-18 ft. tall, somewhat branching above: Ivs. 

 sessile, ovate to elliptic, acute, undulate: fls. in loose, 

 long-pedicelled, terminal panicles, drooping; tubes 

 greenish, 2 or more times the length of the calyx; 

 corolla broader and whiter than in N. tomentosa with a 

 bright red margin. A hybrid between N. tomentosa 

 variegata and N. Tabacum macrophyllum originated in 

 Germany in 1903 by Franz Ament. It is poorly 

 described and as yet little known in the U. S. M.D.G. 

 19:208. Gt. 54, p. 43. Flowers continually through- 

 out the season. 



DD. Corolla 4 times longer than the calyx; stamens slightly 

 or not at all exserted. 



13. Langsdorffii, Weinm. Herbaceous, annual, pilose 

 to downy: st. 2-3 ft. tall, branching: lower Ivs. ovate 



with a short narrow petiole, undulate, obtuse; upper 

 Ivs. ovate-elliptic or somewhat lanceolate, sessile, decur- 

 rent, acute: fls. paniculate, drooping; calyx 5-toothed, 

 upper teeth longest; corolla greenish yellow, salver- 

 form, the tube clavate and swollen above, 3 times 

 longer than the calyx; limb yellow within, obsoletely 

 5-lobed; lobes obtuse, somewhat emarginate: caps, 

 obtuse, slightly longer than the calyx. Brazil and 

 Chile. B.M. 2221, 2555. 



cc. Lvs. petiolate. 

 D. Corolla 2-3 times longer than the calyx. 



E. Fls. yellowish or greenish. 

 P. Plants up to 6-7 ft. tall, robust with large heavy Ivs. 



14. wigandioides, Koch. Herbaceous, perennial, of 

 shrubby habit, glandular-pubescent: st. erect, 6-9 ft. 

 tall, somewhat branching below: Ivs. petiolate, ovate, 

 acuminate, undulate: infl. paniculate; fls. pedicelled, 

 drooping; calyx campanulate, teeth unequal, acumi- 

 nate, glandular-pubescent; corolla salverform, yellow- 

 ish white; limb somewhat reflexed; lobes broadly ovate, 

 cuspidate; stamens included, filaments tomentose at 

 base; style clavate; stigma green; ovary conical, ring 

 fleshy, reddish, surrounding the base. Sent to the Cra- 

 cow Botanical Garden from Colombia about 1852 by 

 Warscewicz. B.H. 23:331. A very striking plant for 

 bold tropical effects. 



FF. Plants not over 4 ft- toJl, slender and smaller-lvd. 



15. rustica, Linn. Herbaceous, annual, sometimes 

 bi- or triennial, somewhat viscous pubescent: st. about 

 3 ft. tall, branching below: Ivs. petiolate, large, thick- 

 ened, ovate or oblong, cordate or subcordate, entire or 

 rarely undulate, obtuse: fls. day-opening, pedicellate, in 

 terminal racemes, yellowish or greenish, about 1 in. 

 long; tube cylindric, inflated above, contracted at the 

 throat, slightly villous, 2-3 tunes longer than the calyx; 

 limb glabrous, yellowish; lobes short, rounded: caps, 

 ovate to subglobose, apex often somewhat umbilicate. 

 Mex. and Texas. Barton, Fl. 1:25. Said to be the 

 first species of tobacco intro. into Eu. Its use was 

 made known by John Nicot for whom the genus was 

 named. 



EE. Fls. reddish yellow. 



16. glutinosa, Linn. Herbaceous, viscid-pubescent 

 throughout: st. angular above: Ivs. petiolate, subrotund 

 to ovate, cordate, abruptly acuminate: fls. in terminal 

 racemes, drooping, bracteolate; calyx somewhat 

 2-lipped, lower lobe 2-parted, upper lobe 3-parted, 

 teeth lanceolate-acuminate, the upper largest, rather 

 long, recurved; corolla reddish yellow, viscid-pubescent 

 without, twice longer than the calyx; tube incurved, 

 swollen above; limb 5-parted; lobes ovate, acute: caps, 

 ovate, obtuse, included within the calyx. Peru and 

 Bolivia. And. Bot. Rep. 484. Intro, into the U. S. 

 from Italy in 1908. 



DD. Corolla 5-6 times longer than the calyx. 



17. paniculata, Linn. Herbaceous, annual, viscid- 

 pubescent: st. 2-3 ft. tall, simple, angular above, 

 branching: Ivs. petiolate, subcordate, ovate or sub- 

 orbicular, obtuse or abruptly apiculate, the upper ovate, 

 acute: fls. pedicellate, bracteolate, in large terminal 

 panicles; calyx with 5 nearly equal linear teeth; corolla 

 yellowish green, salverform, tube clavate, glabrous, 

 nearly 6 times longer than the calyx, contracted at the 

 throat; limb plicate, green, very short, becoming 

 revolute; lobes acute: caps, ovate, obtuse, slightly 

 longer than the calyx. Peru. R. &. P. Fl. Peruv. 129. 

 Not much cult. 



AAA. Fls. in panicled corymbs; lobes acute; corolla funnel- 

 form, throat more or less inflated, red or rarely 

 white. (Subgenus Tabacum.) 



18. TabScum, Linn. TOBACCO. Herbaceous, annual, 

 sometimes bi- or triennial and somewhat shrubby at 



