SCROPHULARIACEAE. 219 



5-angled, not half as long as the white corolla, this 6-10 cm. long; capsule 

 ovoid, densely prickly, the lower prickles usually shorter. Sparingly intro- 

 duced. 



Datura tatula L. Much like D. stramonium, but the stem purplish, the 

 corolla pale-violet and the prickles of the fruit nearly equal in length. In- 

 troduced in a few places. 



327. NICOTIANA. Tobacco. 



Rank acrid-narcotic herbs; leaves mostly entire; flowers in 

 racemes or panicles, sometimes showy; calyx bell-shaped or 

 oblong, 5-toothed or lobed, persistent; corolla commonly funnel- 

 form or salverform, the plaited border 5-lobed; stigma capitate, 

 somewhat 2-lobed; fruit a smooth 2-4-valved 2-celled capsule; 

 seeds numerous, small. 



Nicotiana attenuata Torr. Annual, erect and slender, 30-60 cm. high, 

 glandular-pubescent, especially above; leaves entire, petioled, the upper 

 lanceolate or linear, attenuate-acuminate, the lower oblong or ovate, 3-10 cm. 

 long; panicle loose, bracteate only below; calyx 6-8 mm. long, the teeth lan- 

 ceolate or subulate, subequal, much shorter than the tube; corolla white, 

 tubular-salverform, 2.5-3 cm. long, the limb ascending, 5-lobed, 8-12 mm. 

 broad; capsule as long as the calyx-tube. Sandy soil in the lower valleys. 



Family 82. SCROPHULARIACEAE. Figwort Family. 



Herbs, sometimes shrubs; leaves alternate or opposite, without 

 stipules; flowers perfect, mostly complete and irregular; corolla 

 irregular, more or less 2-lipped, the upper lip 2-lobed, the lower 

 3-lobed; stamens on the corolla-tube, the fertile 4 and didyna- 

 mous or only 2, rarely 5 present and all fertile ; style single; stigma 

 entire or 2-lobed, fruit a 2-celled usually many-seeded capsule, 

 with axile placenta; seeds mostly small; endosperm copious. 



Anther-bearing stamens 5; leaves alternate. 328. Verbascum, 220. 



Anther-bearing stamens 2 or 4; leaves alternate, 

 opposite or whorled. 

 Fifth sterile stamen present. 



Corolla spurred at the base. 329. Linaria, 220. 



Corolla not spurred. 



Sterile stamen elongated, about equal- 

 ling the others. 330. Pentstemon, 221. 

 Sterile stamen a gland or scale adherent 

 to the upper side of the corolla. 

 Peduncles several-flowered. 331. Scrophularia, 223. 

 Peduncles 1-flowered. 



Corolla conspicuously 2-lipped. 332. Collinsia, 223. 

 Corolla obscurely if at all 2-lipped. 333. Tonella, 224. 

 Fifth sterile stamen not present. 

 Stamens 2; anther-bearing. 



Calyx 5-parted. 334. Gratiola, 224. 



Calyx 4-parted. 



Leaves alternate, mostly basal. 335. Synthyris, 224. 



Leaves at least the lower opposite. 336. Veronica, 225. 

 Stamens 4, either perfect or sterile. 



