CARDUACEAE 1349 
Heads few (5-15): involucral bracts firm, thickish, strigil- 
lose: blades of the basal leaf spatulate to oblanceolate, 
the inner much shorter-petioled than outermo 42. S. pulchra. 
XV. FLEXICAULES 
Plant with long slender ULL stolons: bas rosettes wanting or ver 
inconspicuous : leaf- blades gradually reduced upward, uo a apes not pellucid- 
punctate, the lateral veins well developed: lower heads illary clusters, the 
upper spicate ; all small, medium sized or s 'ely rather lare p» m . high: stigmas 
triangular- lanceolate : achene silky- -pubese n 
Involueral bracts one-ribbed or essentially so (the lateral 
ribs wanting or developed towards base only). 
Stem. a -branches, and involucre glabro ous or 
S 
Stem and branches bluish- -gray and more or SS 
glaucous (before too old), the stem terete, or 
long a zi 
ally 
hd slenderly about 10-ribbed. 
He DS age Ga MAE an Tue base, firm, 0.5- 
e 1- A . lo np: involucre 
$5 tam hi Pel ots -2 43. S. caesia. 
Leaf. blades ‘cuneate. tapering PE the DE thin, 1.5- 
5.5 c Me petioles 1-5 mm. long: i nvolucre 
4.4.5 m righ, 2.5 “3.5 mm. wide, 44. S. latissimifolia, 
Stem and Brandis E not eeu ous, the 
Strongly angled, usually zig-zag: le af bla des 
broadly oe 2.5-10 cm. wide, nies than twice as zi 
long GM vide: achene with ribs concealed by RH ca 
cen 45. S. flezicaulis. 
Stem, a en cd! branches, and involucre DE 
BE part of the thyrse DES like: os 3-4.5 
high: stem terete below, not glau 46. S. pubens. 
Inv olueral "bracts 3-5-ribbed. »" 
Involucre narrowly campanulate, 3-4.5 mm. high. © 4T. S. Curtisü. 
In. SD DCEE pal campanulate, 5-6 mm. high. 48. S. lancifolia. 
XVI. ALTISSIMAE  . 
Plant with long slender horizontal stolons: basal e one or hio 
inconspicuous: leaf-blades not triple-ribbed, often conspicuously veined: heads mall 
to rather large e, 3.5-8 mm. high; at least the lower heads ünilaterally a. 
ic appendages triangular- lanceolate: achene pubescent, not strongly ribbed. 
Leaf-blades narrowly  linear-oblong, linear-lanceolate, or 
e T te. channeled, with the lateral veins 
a ns obseure, those of the lower leaves at least 
d ved- 2 eading or recurved, and more or less twisted 
l 49. S. tortifolia. 
Leaf-blades odes neither markedly channeled, recurved- 
spreading, or d at the base, with the lateral 
, p) promin 
eeth or fives Sronely De heute above. 50. S. fistulosa. 
elliptic i 
o m ccep 
developed widely spreading branches. 51. S. dispersa. 
Heads strongly secund on w idely spreading branches. 
tem strongly hairy above d IoHDd plants. 
Leaf-blades not cor rdate, short-petioled, acute 
volucre cylindric, the pedicel moderately 
bracteolate 02. S. altissima, 
Mi -developed leaf-blades shallowly cordate, 
sile very short-petioled, obtuse or 
s a 
n the stem 
z 
reely pustular hairs: involucre 
‘turbinate-cylindrie, ae pedicel usually very 
ngly bracteola 53. S. celtidifolia. - 
Stem glabrous below the E or sparingly 
Al wet- -ground or damp-ground 
