COMPOSITE. (COMPOSITE FAMILY.) 230 



* # Involucre \2-40-Jlowered, hairy, as vxll as the peduncles. 



7. I¥. l-accmosus, Hook. Stem wand-fike, simple (2° -5° high), smooth, 



as well as the oval or oblong-lanceolate denticulate leaves ; the lower tapering 

 into winged petioles (rarely cut-pinnatifid), the upper partly clasping; heads in 

 clusters crowded in a long and narrow interruptedly spiked panicle ; involucre about 

 12 flowered; pappus straw-color. — Plains, Ohio to Wisconsin, and northward. 

 Also Hackensack marshes, New Jersey. Sept. — Flowers flesh-color. 



8. W. asper, Torr. &.Gr. Stem wand-like, simple (2° -4° high), rough- 

 pubescent, as well as the oval-oblong or broadly lanceolate toothed leaves ; heads 

 in small clusters (mostly erect) disposed in a long and narrow coivound raceme; 

 involucre 12- l-i-flowercd; pappus straw-color. — Dry prairies and barrens, Ohio 

 to Illinois, and southward. Sept. — Flowers larger than No. 7, cream-color. 



9. N. crcpidiiieus, DC. Somewhat smooth ; stem stout (5° -8° high), 



bearing numerous nodding heads in loose clusters on the corymbose-panich-d 

 branches; leaves large (6' -12' long), broadly triangular-ovate or halberd-form, 

 strongly toothed, contracted into winged petioles; involucre 20 - 40-flowcml ; 

 pappus brown. — Rich soil, Ohio to Illinois and southward. Sept. — Involucre 

 blackish ; flowers cream-color. 



78. TBOXIMON, Nutt. Thoximon. 



Head many-flowered. Scales of the bell-shaped involucre ovate or lanceo- 

 late, pointed, loosely imbricated in 2 or 3 rows. Achcnia smooth, 10-ribbed, 

 not beaked. Pappus longer than the achenium, white, of copious and unequal 

 rather rigid capillary bristles, some of the larger gradually thickened towards 

 the base. — Perennial herbs, with linear elongated tufted root-leaves, and a sim- 

 ple naked scape. Heads solitary, large : flowers yellow. (Name from rpa^opat, 

 to eat, first applied to a plant with an edible root.) 



1. T. CUSpitffstsam, Pursh. Leaves lanceolate, elongated, tapering to 

 a sharp point, woolly on the margins ; scales of the involucre lanceolate, sharp- 

 pointed. — Prairies, Wisconsin, N, 111., and westward. April, May. 



19. TARAXACUM, llaller. Dandelion. 



Head many-flowered. Involucre double, the outer of short scales ; the inner 

 of long linear scales, erect in a single row. Achenia oblong, ribbed, and rough- 

 ened on the ribs, the apex prolonged into a very slender thread-like beak, bear- 

 ing the pappus of copious soft and white capillary bristles. — Perennial herbs, 

 producing a tuft of pinnatifid or runcinatc radical leaves, and slender naked 

 hollow scapes, bearing a single large head of yellow flowers. (Name from 

 rapdo-aa, to disquiet or disorder, in allusion to its medicinal properties.) 



1. T. Deiis-lednis, Desf. (Common Dandelion. ) Smooth, or at 

 first pubescent; outer involucre reflexed. — Pastures and fields everywhere: 

 probably indigenous in the North. April -Sept. — After blossoming, the inner 

 involucre closes, the slender beak elongates and raises up the pappus while the 

 fruit is forming, the whole involucre is then reflexed, exposing to the wind the 

 naked fruits, with the pappus displayed in an open globular head. (Eu.) 



