CARDUACEAE 1433 
oua not revolute-margined, 
not undulate, not tomentulose 
Aa 
Leaf- blades se rrate, the lower sur- 
eda labrous except on the 
erv ee 25. 
Leaf-blades entire, at most, ob- 
se iA denticulate, long-hispid 
ben 
. montanus. 
Leaf-blades of a broadly Enc 2 ovate type. 
Heads small: disk less than 8 mm. wide, 
Leaves, stems, and bracts entitely glabrou 27. 
Some or all of these parts more or less D en t. 
Lea z blades firm, copiously resin- PR beneath : 
H 
26. H. alienus. 
H. laevigatus. 
H 
em dark and D glaucous. 28. H. glaucus. 
Lent blades thin, remotely if at all ceto: dotted 
beneath: s ER ight, at most faintly 
a ; 
Bracts the involucre linear, abruptly 
Cupied- vu short. 29. H. decapetalus. 
Bracts of the involucre loo e but not re- 
xed : peduncles ae and. very slender, 30. H. microcephalus. 
Heads larger: disk more than 8 mm 
Leaf-blades broadly decurrent o eoe lateral 
nerves confluent only a TM ue the middle 
of the blade, the AR from the confluence 
often as long as the 
Basal leaves numerous, Spree ximate and per 
sis a t; cauline leaves few and greatly re- . 
duc 31. H. occidentalis. 
Basal leaves often fugacious; cauline leaves 
a evenly disposed on the stem and not . 
dd educed. 2. H. Dowellianus. 
Leaf-Hades eile or petiolate; if decurrent, the 
petiole (from the confluence of the lateral 
ml much less than half the length of th 
e 
Bracts of the involucre about as long as the disk. 
Leaves opposite; blades sessile and often 
clasping: bra nches conspicuously erect. 33. H. mollis. 
Leaves opposite or alternate; blades not 
clasping : branches spreading. 
Base Eo leaf-blade obtuse, cordate or 
undish ; petiole distinct or blade 
only briefly decur 2L 
Leaves ODDO site and "divari cate. 34. H. divaricatus. 
Leaves alternate (ra Be pec 
not divaricate. 35. H. saxicola. 
Base of leaf-blade more poin ted, decur- 
Leaves mostly or all alternate, light 
reen, even a Short-hispid above, 
short- ‘hirsute beneath, not glaucous 
beneath. 36. H. tuberosus. 
Leaves m tly opposite, dark green 
above, glabrous beneath, except on 
the nerves, and 37. H. strumosus. 
Bracts of the involucre longer pies “the disk. 
H. decapetalus and H. reindutus) ; 
ade-decurrent to the base of the petiole. 38. H. reindutus. 
Blad t Der to the e of 
etiole, distinctly petiolate. 
Leaf-blad E thin, ovate, very sparingly 
pubescent branches of the inflo- 
rescence and rarely the uppermost 
leaves alterna 29. H. decapetalus. 
Leaf-blades aa "bsoadiy lanceolate, 
ER rough-pubescent : branches 
e i ud pposite. 9. H. hirsutus. 
Leaves altern e (lower cauline rarely oppo- 
site in A o 
f Blades densely tomer e ben eath 
S ie broadly decurrent 
the ud x the | 40. H. doronicoides. 
Leaf-bla des t-petio- 
late, pes broadly CURE and mus 
qui ite o the base of the petio 22. H. tomentosus. 
MED sss sss s eS 
