250 
SYNGENE8IA ^QUALIS. 
510 RUDBECKIA. 
511 CENTAUREA. 
POLYGAMIA NECESSARIA, 
512 CHAPTALIA. 
513 SILPHIUM. 
514 POLYMNIA. 
615 CHRYSOGONUM, 
616 GYMNOSTYLES. 
517 PARTHENIUM. 
618 IVA. 
519 AMBROSIA. 
620 XANTHIUM. 
POLYGAMIA SEGREGATA. 
521 ELEPHANTOPUS. 
LEONTODON. 
Involucrum imbrica- 
tum, squamis inferiori- 
bus, laxiusculis. Pap- 
pus plumosus, stipita- 
tus. Receptaculum 
nudum. 
1. Taraxacum. 
L. involucri squamis 
exterioribus reflexis; 
scapo unifloro; foliis 
runcinatis, glabris, la- 
ciniis lanceolatis, den- 
tatis. 
Gen. Pl. 1237. 
Involucrum imbri- 
cate, “with the lower 
scales loose. Pappus 
feathered, stipitate. 
Receptacle naked. 
Exterior scales of 
the involucrum reflect- 
ed; scape one-flower- 
ed; leaves runcinate, 
glabrous, the segments 
lanceolate, toothed. 
Sp. pl. 3. 2544. Mich. 2. p. 88. Pursh, 2. p. 497. Nutt. 2. p. 123. 
Root perennial. Leaves all from the root, oblong, runcinate, glabrous, 
when young a little hairy. Scapes several from each root, terete, glabrous, 
shorter than the leaves, one-flowered. Leaves of the involucrum numerous; 
the interior series equal, appressed, frequently coloured, when old reflexed, 
the exterior lanceolate, imbricate, slightly fringed. Corolla ligulate, yel- 
low. Seeds oblong, angled, compressed towards the summit, slightly mu- 
