POTATO FAMILY 683 



2. Datura Stramonium L. Jimson-weed. Fig. 4508. 



Datura Stramonium L. Sp. PI. 179. 1753. 



Simple to spreadingly branched erect annual 3-15 dm. tall with green, sparsely puberulent 

 to glabrate stems and foliage. Leaves ovate to elliptic, 5-20 cm. long, smuately to acmiately 

 lobed, or petioles about one-half as long as the blade; calyx 3.5-4.5 cm. long, the teeth unequal, 

 5-10 mm long the persistent basal portion reflexed in fruit ; corolla white, 6-8 cm. long, the 

 limb 3-5 cm. broad, bearing 5 subulate teeth 5-8 mm. long; capsule erect, ovoid, 3.5-5 cm 

 long armed with spines 3-10 mm. long, or sometimes unarmed, finely and sparsely puberulent 

 to giabrate, dehiscing from apex by 4 valves ; seeds black, rugulose and finely pitted. 



In waste places throughout most of the United States; southward through Mexico into northern South Amer- 

 ica; introduced in warmer parts of Europe, Asia, and Africa. Type locality: "Habitat m America, nunc vulgari.s 

 per Europam." June-Sept. 



Datura Stramonium var. Tatula (L.) Torr. FI. N. Mid. U.S. 232. 1824. (Datura TatuJah. Sp. PI. ed. .2 

 1 • ^56 1762 ) Stems purplish; corolla with white limb and deeply violet or purple-flushed throat ; spines of fruits 

 tending to be more uniform in length than in the species. Oregon southward to tropical America. Type locality: 



3. Datura ferox L. Chinese Datura or Thorn-apple. Fig. 4509. 



Datura ferox L. Amoen. Acad. 3: 403. 1756. 



An openly branched coarse herb 2.5^.5 dm. tall, with sparsely pubescent to glabrate stems 

 and herbage. Petioles slender, 3-8 cm. long; leaf -blades broadly ovate, 5-15 cm. broad, to 

 2 dm long, obtuse to truncate at the base, obscurely pentagonal in outline, the margins coarsely 

 sinuate-dentate; flowers erect; pedicels 1-2 cm. long; calyx 3-4 cm. long, the teeth rounded, 

 triangular, acuminate, 3-4 mm. long, nearly equal; corolla 6-8 cm. long, the limb 2.5-3.5 cm. 

 broad, teeth slender, 3-5 mm. long; capsule ovoid, 4-5 cm. long, sparsely puberulent, heavily 

 armed with spines 1-3 cm. long, the larger to 1 cm. broad at the base; seeds rcniform, 5-5.5 mm. 

 long, rugulose and minutely pitted, light brown. 



A native of Asia sparingly established in the northern Sacramento Valley. Type locality: "Habitat in China." 

 May-July. 



4. Datura discolor Bernh. Desert Thorn-apple. Fig. 4510, 



Datura discolor Bernh. Linnaea 8: Litt. Ber. 138. 1833. 

 Datura Thomasii Torr. Pacif. R. Rep. 5: 362. 1856. 



Erect annual 2-6 dm. tall with finely puberulent, green or somewhat cinereous herbage. 

 Leaves broadly ovate, sinuately and angularly few-toothed to entire, 3-15 cm. long, petioles one- 

 fourth to one-half as long as the blade ; calyx prismatic, 4-7 cm. long, the persistent basal 

 part mostly rotate; corolla white with purplish flush in throat, 10-15 cm. long, the limb 5-8 cm. 

 broad; the teeth 4-7 mm. long, narrowly subulate; anthers white; capsules nodding, globose, 

 2.5-3 cm. in diameter, heavily spinose, glandular-puberulent, the spines 1-2 cm. long; seeds 

 black, rugulose and finely pitted. 



Sandy flats, dry stream beds, and margins of cienagas. Lower Sonoran Zone; Colorado Desert into Arizona. 

 West Indies, Sonora, and Lower California. Type locality: West Indies. March-Oct. 



9. NICOTIANA [Tourn.] L. Sp. PI. 180. 1753. 



Narcotic-poisonous, heavy-scented, usually viscid-puberulent annual or perennial 

 herbs or shrubs. Leaves alternate, entire, or sometimes repand, petiolate or sessile. In- 

 florescence few- to many-flowered, racemose or paniculate, terminal. Calyx tubular- 

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

 or tubular, the shallowly 5-lobed limb usually spreading-. Stamens 5; filaments filiform, 

 inserted near the base of the corolla-tube. Style slender; stigma capitate. Ovary 2- 

 celled or rarely 4-celled. Capsule ovoid, acute. 2- or 4-valved at the summit. Seeds 

 numerous, small, ovoid to reniform, minutely reticulate-punctate. [Named for Jean 

 Nicot, who introduced tobacco into France from Portugal.] 



A genus of about 30 species in North and South America, Australia, and a few islands of the Pacific. Type 

 species, Nicotiana Tabacum L. 



Shrubs; flowers yellow; leaves glaucous, glabrous. 1. N. glauca. 



Herbs; flowers white, greenish white or pale cream, sometimes tinged with violet; leaves glandular and pubescent. 

 Leaves auriculate-clasping at the base; plants biennial or perennial. 2. N. trigonophylla. 



Leaves not auriculate-clasping; plants annual. 



Stamens inserted nearly equally at bottom of throat or at apex of corolla-tube proper; corolla-limb 

 6-20 mm. wide. 

 Cauline leaves petioled; corolla 2-4 cm. long, not constricted at orifice. 



Calyx-lobes acute, subequal, shorter than or about equaling the tube, not obviously striped; 

 calyx-tube strongly pock-marked at maturity; corolla-limb 6-12 mm. broad; herbage 

 sparsely glandular. 3. A', attenuata. 



Calyx-lobes linear-lanceolate, unequal, mostly exceeding the tube, each with an obvious dark 

 median stripe; calyx-tube sparingly or not at all pock-marked; corolla-limb 12-22 mm. 

 broad; herbage densely viscid-glandular. 4. A', acuminata multiflora. 



Cauline leaves sessile, or few lower ones petioled; corolla 1.5-2 cm. long, distinctly constricted 

 just below the orifice. 5- -V- Clevelandit. 



Stamens unequally inserted high in throat of corolla; corolla-limb 2-5 cm. broad. 



6. N. Btgelovti. 



