178 PRACTICAL BOTANY. 



398. Pod opening by a lid, and enclosed in the urn- 

 shaped calyx. Corolla with an oblique and short tube, the 

 border somewhat unequal and plaited, dull yellowish, strongly 

 reticulated, with purple veins. Clammy-pubescent, fetid, 

 narcotic. Leaves sinuate-toothed, or angled. Flowers 

 sessile in 1 -sided spikes. Hyoscyamus niger, L. 



Pod opening lengthwise 399 



399. Calyx prismatic, 5-toothed, separating transversely 

 above the base in fruit, the upper part falling away. Corolla 

 funnel-form, Avith a large, 5- to 10-toothed, plaited, spreading 

 border. Stigma 2-lipped. Pod globular, prickly, 2- (or rather 

 imperfectly 4-) celled, 4-valved. Rank, narcotic, poisonous 

 weeds. Leaves ovate, angular-toothed. Flowers large, 

 showy, white, in the forks of the stem. 



Datura Stramonium, L. 

 Calyx not prismatic 400 



400. Pod 2- to 6-seeded, globular. Herbs twining, trailing, 

 creeping, or prostrate 401 



Pod many-seeded. Plants erect, or rarely procum- 

 bent. Calyx tubular-bell-shaped, 5-cleft. Corolla funnel-form, 

 or salver-shaped, yellowish-green, the plaited border 5-lobed. 

 Pod 2-celled. Nicotiana rustica, L. 



401. I. Styles 2, or rarely 3. Stigma depressed-capitate. 

 Leaves linear or linear-lanceolate. Peduncles longer than 

 the leaves, 1- to 3-flowereci. Corolla white, slightly downy 

 outside. Stylisma evolvxiloides, Choisy. 



II. Styles united into 1 to far above the middle. 

 Leaves narrowly-linear. Bracts resembling the leaves, 

 equalling the flower. Stylisma Pickeringii, Gray. 



III. Styles united. Leaves cordate, sagittate, 

 hastate, fiddle-shaped (or sometimes pinnatifid) 402 



40^. Calyx enclosed by 2 broad, leafy, mostly cordate 

 bracts. Style with 2 linear-oblong stigmas. Pod half 

 2-celled. Leaves heart-shaped, or sagittate. Peduncles 

 axillary, 1-flowered. Corolla white, sometimes tinged w^ith 



Calystegia. 

 Calyx not enclosed by bracts 403 



403. Stamens exserted. Corolla cylindrical-tubular, with 

 a spreading border. Stigma capitate-2-lobed. Pod 4-celled ; 



