1400 CARDUACEAE 
P. adnata (H. & B.) C. Mohr, Mexiean, with winged stem and branches: nar- 
rowly laneeolate leaf-blades; lanceolate- -acuminate involucral bracts; and said 
to have a perennial rootstock has been reported as adventive on ballast in Ala. 
45. CHSIA Griseb. Perennial, inconspicuously pubescent, slender 
herbs. Leaves alternate, mostly basal: blades toothed. Heads scattered in open 
corymbs. Involucres campanulate: bracts 
very unequal, the inner much longer and 
somewhat narrower than the outer. Flowers 
yellow, the ipid marginal: corollas fili- 
form. Per wer la 
t flo central: corol r- À 
rowly E funnelform: lobes ovate. Pap- 
pus a single series of icd slender bristles. 
—Four species, West India 
S. bahamensis Urban. Plant 1-6 dm. 
tall; eae of the et leaves firm, spatu- 
lat long, those of the stem-leaves 
mu ic ade unt E braets 
various, the outer membra ~ inner 
chaffy, 5-6 mm. long, very narr aly “lin 
o 2.5 mm. long.—Pine eer iverglade Keys, Fla. and Florida Keys. 
(W. I.)—Spr.-sum, 
46. PTEROCAULON Ell. Perennial, tomentose or woolly, stout herbs. 
ns alternate: blades entire or shallowly toothed, decurrent. Heads borne 
ontiguous or separated glomerate cymes 
Mur eres rather narrow, densely Aono 
bracts unequal, the inner narrower than the 
outer. Pistillate flowers marginal: corollas 
filiform. Perfect flowers centr i corollas 
with a funnelform throat and a 
of Nic bristles. SO dit id Cass.] 
t 12 species, mostly American 
1. P. undulatum (Walt. C. Mohr. Plant 
2-7 dm. tall: leaf-blades elliptic to rd 
late, 4—12 em, long, undulate: pii 0-4 
mm. high: flowers whitish or cream, lobes. d the staminate corollas linear.— 
[P. pycnostachya (Michx.) 1. ]—(Br oor.)—Pinelands, Coastal Plain, 
Fla. to Miss. and N. C.—Spr.-fall — The "thick k black root gives this plant its 
common name. 
47. ANTENNARIA Gaertn. Perennial woolly, stoloniferous herbs. 
Leaves epee, those of the short caudex different from those of the flower- 
g stem: blades entire. Heads in a terminal cluster, or rarely solitary. In 
volueres lub e to campanulate, many-flowered: bracts with petaloid tips, 
those of the ae involueres larger than those of the pistillate. Flowers 
whitish, dioecious or polygamo-dioecious. Pappus-bristles united at the base.— 
