1432 CARDUACEAE 
Blades of the cauline leaves of a lanceolate to ovate 
e. 
Leaves opposite, 
Bracts of the Dy ouen linear, mucronate: 
leaves chiefly 
Bracts of bes involucre lanceolate, not mucro- 
nate: leaves caulin 
Leaves ENS e 
is n diameter. 
3 em. in diam ete 
toward center of disk, conspicuously 
nae bearded. 
Chaff not thus bearded. 
Leaf-blades  decurr 
towa e e: annual. 
era not thus. “ciliate (often undu- 
: perennial. 
Leaf-blades obviously petioled. 
Stem, especially the biandles con- 
Spieuously white-villous. 
Stem sages or, less pubescent, but not 
as a 
ve, 
Plant erect: stems more or less 
mottled. 
Ja ant D 
stems not con- 
Spi usly mottled, 
Leaves densely white-pubescent, especially beneath, 
mar ls wanting or minute, the ligules less than 3 mm. 
II. FLAVI 
Leaves verticillate. 
Leaves not verticill ate. 
Leaf-blade 
Head Saee: disk about 1.5 c 
Heads several: disk about 1 Dg 
xb of a linear, ees or vate con less than 
10 times as lon 
eat bide: linear io Mane ola te: never broadly so. 
Leaf-blades densely white-pubescent both sides. 
eaf-blade En more or less pubescent but not as above. 
ranc Ri the inflorescence and leaves 
it o op site. 
Leavy aE -hispid : d aes 
longer a a disk and r 
Leave 
da ter. about equ to disk and erect, or leaf- 
below 
inflorescence and leaves below 
it alterna tes 
Mature oe leaf-blades deeply and irregu- 
larly serrate. 
Cauline leaf blades entire or serrate, but not 
as a 
Bracts longer than the disk, very loose. 
evenly tomentulose ; blades 
d tted 
f the ray 
ight. "véllóse 
Bracts Ebo as long q as the disk, not con- 
ute margins, 
ually undulate, ue tomentose be- 
cath. 
Qo 
m 
19. H. 
20. H. 
x2 
an 
Mom hh 
i- H. 
atrorubens. 
rigidus. 
annuus. 
petiolaris. 
agrestis. 
floridanus. 
vestitus. 
cucumerifolius. 
debilis. 
argophyllus. 
radula. 
verticillatus, 
simulans, 
arnosus., 
longifolius. 
Schweinitzii. 
stenophyllus. 
Eggertii. 
21. H. grosse-serratus. 
Qo 
. H. 
. H. 
tomentosus. 
Mazrimiliani, 
. giganteus. 
H. floridanus. 
