CARDUACEAE 
Blades of Rena basal and lower cauline leaves not cordate or 
trun 
jusserat ' bracts ciliate, SPI n above: leaves larger, 
with np ee a 
Stem EM or gla 
Stem strigo 
Involueral brace ciliate, pubescent above: leaves small 
medium, with acute or short-acuminate blades 
Upper s with cuneiform or elliptic- janceointe 
bl 
Well-developed disks 1—1.5 em. in diameter : ligules 
of the ray relatively short. 
Well-developed disks smaller: ligules relatively 
arge. 
Upper leaves with conspicuously dilated blade. 
V. SPECIOSAE 
Ligules of the ray large and showy, much exceeding the 
diameter of the disk. 
Leaf-blades laciniate or Mond coarsely den 
revai 
Plant glabrous or near 
Plant densely hirsute. 
Ligules short, often less than the diameter of the disk. 
VI. GRAMINIFOLIAE | 
Plant pubescent: ligules of the ray crimson. 
Plant glabrous: ligules yellow. 
VII. TRILOBAE 
Blades of the lower cauline leaves, or some of them pal- 
mae 3- D ed. 
Di d -13 m ray-flowers with ligules 1.5-2.5 cm. 
Disk 15-20 mm. wide: ray-flowers with ligules 2-3.5 cm. 
ng. 
Blades “of i. qune cauline leaves, or some of them pinnately 
Bracts of the involucre, or most of them, as long as the 
ligules of the ray: Alleghenian species. 
Bracts of the involucre, or most of them, not half as long 
as the ligules : Floridian species. 
VIII. BICOLORES 
Plant hispid: ligules of the ray brown-purple at the base. 
JX. HIRTAE 
Well-developed disks 1 pun Rus diameter or more: ligules of 
the ray large and s 
Blades of the upper pauline leaves not of an ovate a 
Petioles of the basal leaves ine exceeding 1 dm. in 
Leaf- blades broader than linear. 
xis or stem not divergently branched. 
pper Cauling: leaves Spee: lanceolate or 
lanceolate, or narrower 
Upper cauline leaves elliptic, subcordate- 
clasping. 
n axis or stem oe branched, 
ually from near the 
Lea f-blades linear or linear-lanceolate elongate. 
Petioles of the basal leav or some of them, con- 
Spicuously elongate. 
PRISE an the upper cauline leaves, or some of them, of 
Blades. of the basal leaves 5-6 cm. wide: involucral 
. bracts often foliaceous. 
Blades of the basal leaves narrower : involucral bracts 
not foliaceous. 
Well-developed disks smaller: ligules of the ray short. 
15. 
6. 
17. 
29. 
30. 
37. 
1423 
. R. palustris. 
R. acuminata. 
R. fulgida. 
R. foliosa. 
R. spathulata. 
Su oon 
spec 
R. 
R. 
R. truncata. 
R. missouriensis. 
R. ten 
. R. gr Du UE 
R. 
Mohri 
. R. triloba. 
. R. rupestris. 
. R. Beadlei. 
. R. pinnatiloba. 
R. bico lor. 
R. hirta. 
R. amplectens. 
2. R. divergens. 
. R. sericea. 
. R. longipes. 
. R. Brittoni. 
. R. monticola. 
R. floridana. 
