by the Indians. A^. trigonophylla is still used for this purpose, chiefly on ceremonial 

 occasions. Animals usually avoid these plants, but cases of poisoning in cattle, 

 horses, and sheep have been reported. Tree tobacco {N. glauca) contains an 

 alkaloid, anabasine, reported to be more efficacious than nicotine in killing 

 certain species of aphid." 



1. Trees or large shrubs; leaves glaucous, glabrous; flowers yellow 



1. N. glauca. 



1. Plants herbaceous; leaves green, more or less viscid-pubescent; flowers mostly 



white, often variously tinged with green, violet or red (2) 



2(1). Leaves commonly repand or panduriform 2. N. repanda. 



2. Leaves entire or the margins more or less undulate or crisped (3) 



3(2). Corolla 12-23 mm. long, greenish; capsule 11 mm. long or less; native 

 to western half of Texas westward 3. N. trigonophylla. 



3. Corolla 25 mm. long or more, not noticeably greenish; capsule more than 



11 mm. long; introduced in south Texas 4. N. plumbaginifolia. 



1. Nicotiana glauca Grab. Tree tobacco, mustard tree, rape, gigante, buena 



MOZA. Fig. 680. 



Glabrous shrub or small tree to 8 dm. high; leaves long-petiolate, glaucous, 

 somewhat leathery, ovate to oblong-lanceolate, 5-18 cm. long, cuneate to sub- 

 cordate at the base, obtuse to acute at the apex, entire to slightly repai.d: flowers 

 in lax terminal panicles; calyx tubular-campanulate, 8-12 mm. long, 5-toothed, 

 the teeth much shorter than the tube; corolla tubular, greenish-yellow, 35-4^ mm. 

 long, minutely villosulose, the limb narrow; filaments inserted below middle of the 

 tubular portion of corolla; capsule ovoid, acute, 1-1.2 cm. long, 4-valved at the 

 summit; seeds reddish-brown, slightly shining, finely favose-reticulate. 



In sandy or clayey soils along stream banks, wet river banks, edge of lakes 

 and canals, washes, roadsides, on talus slopes and ledges along the coast and in 

 extreme s. Tex., w. to the Trans-Pecos, N. M. (Sierra Co.) and Ariz. (Greenlee, 

 Gila, Maricopa, Pinal, Cochise, Pima and Yuma cos.), flowering throughout the 

 year; a nat. of S. A. that has become naturalized northw. to Tex. and Calif. 



2. Nicotiana repanda Willd. Fiddle-leaf tobacco, wild tobacco, tabaco 



CIMARRON. 



Annual, minutely pubescent or above glabrate, to about 9 dm. high, with loose 

 slender branches extending into open racemose or somewhat paniculate naked 

 inflorescences; leaves thin, ovate or the lower ones obovate and sometimes 

 panduriform, commonly repand, to 2 dm. long and 1 dm. wide, rarely larger, the 

 lowest leaves contracted into a winged petiole, the upper ones deeply cordate- 

 clasping; bracts minute or often wanting; flowers vespertine; calyx lobes slender, 

 fully as long as the short-campanulate acutely 10-ribbed tube; corolla with the 

 tube frequently 5-6 cm. long, somewhat clavate or funnelform at the open throat; 

 corolla limb spreading, white or sometimes tinged with rose, or dorsally brown- 

 striped, to 4 cm. in diameter, its lobes short and obtuse or acute; capsule ovoid, 

 about 1 cm. long, 4-valved; seeds brown, pitted-reticulate, shiny or dull. N. 

 Roemeriana Scheele. 



In sandy or clayey soils along streams, on flats and in wet depressions, shelter 

 of boulders, thickets and moist wooded ravines on the Edwards Plateau and in 

 s. Tex., Feb.-July; also adj. Mex. 



3. Nicotiana trigonophylla Dun. Desert tobacco, tabaquillo. Fig. 680. 



Biennial or perennial, viscid-pubescent, to about 9 dm. high, with a simple 

 or virgately branched stem; leaves all sessile or only the lower ones tapering 

 into a winged petiole and obovate-oblong, the upper ones elliptic-lanceolate 



1453 



