CAMPANULA CE&. 



251 



1. N. ALBUS (White Lettuce). Stem tall, smooth, somewhat glaucous, 

 corymbosely paniculate above ; leaves angular-hastate, often 3-5-lobed ; up- 

 per ones ovate, dentate, or oblong, entire ; involucre purplish ; heads 8-12- 

 flowered in nodding racemes ; pappus brownish. In woods, 2-4 feet high. 

 August, 



2. N. ALTISSIMUS ( Tall White Lettuce]. Smooth ; stem slender, tall ; 

 leaves triangular-ovate, cordate, petiolate, variously lobed and toothed ; peti- 

 oles naked or margined ; involucre of 5 greenish scales ; heads nodding, 5-6- 

 flowered in racemes, forming a long, leafy, virgate panicle ; pappus dirty 

 white or pale straw-color. In woods, 3-6 feet high. August. 



V). Taraxacum. Heads many-flowered. Involucre double ; outer 

 series of short scales. Receptacle naked. Achenia oblong, with a long, 

 filiform beak crowned with the white, copious, capillary pappus. y. 



T. DENS-LEONIS {Dandelion). Acaulescent ; smooth or nearly so ; 

 scapes several, hollow, naked, i-flowered ; leaves runcinately toothed ; heads 

 large, erect, yellow ; outer involucre reflexed. A common plant in fields and 

 pastures. April-October. 



Order XLVI. CAMPANULACE.E (Campanula Family). 



Herbs with a somewhat milky juice. Leaves alternate. Stip- 

 ules none. Flowers usually blue and showy. Calyx-tube adher- 

 ent to the ovary ; limb usually 5-cleft, persistent. Corolla regu- 

 lar, campanulate, usually 5-lobed, withering. Stamens 5, distinct, 

 inserted on the calyx, alternate with the 5 lobes of the corolla. 

 Anthers 2-celled. Ovary 2-5- celled. Capsule crowned with the 

 persistent calyx-tube, opening with loculicidal dehiscence, many- 

 seeded. 



f Campanulate Campanula, 

 f Corolla regular -j 



CAMPANULACE.E. | <- Rotate-#:/ri. 



[ Corolla irregular Lobelia. 



I. Campanula. Calyx 5-cleft. Corolla mostly campanulate, 5- 

 lobed. Stamens 5, broad at base. Stigmas 3-5. Capsule 3~5-celled, 

 opening laterally by pores. 



1. C. ROTUNDIFOLIA (Harebell']. Stem slender, branching, weak ; radi- 

 cal leaves ovate, or roundish, cordate, crenate, on long petioles, soon with- 

 ering and disappearing ; cauline narrow-linear, entire, smooth ; flowers bright 

 blue, nodding ; corolla twice as long as the subulate calyx-teeth. A foot 

 high, growing on rocky banks. July-September, y. 



2. C. APARINOIDES (Prickly Bell-flower}. Stem slender, weak, branch- 

 ing, 3-angled, the angles rough backward ; leaves linear-lanceolate, denticu- 

 late, rough backward on the margin and veins ; flowers small, nearly white, 

 solitary ; corolla much longer than the triangular calyx-teeth. In low 

 grounds. June-August. 



