194 COMPOSITAE 
alc = barbellate bristles or if none the 
s white or ie desert annuals. 
yntrichopappus. 
obscure, scarcely surpassing ae gia wiry-stemmed 
57. Rigiopappus. 
Heads disco 
Som 
id. 
me or all of th 
Rays filiform, 
annual. 
e leaves incised, or pinnately dissected; annuals or perennials. 
Pappus-paleae deeply parted into numerous bristles; achenes obpyramidal. 
58. Trichoptilium. 
Pappus-paleae not deeply parted into numerous bristles; 
clavate, terete. 
All leaves entire (see also C — i annuals. 
u 3-7 mm. high; corollas yellowish. 
us paleae not dusidone in a nn ag plants subglabrous 
gummy; coastal southern California south. 
"62. 
achenes linear- 
$9. -¢) haenactis. 
Amblyopappus. 
Fapeee: Lagos deciduous in a:ring, 1 di ; plants glandu- 
r-hairy; southern Sierra ams ag 
60. Oreochaenactis. 
Involucre 13-20 mm. high; corollas pinkish or city Dnt plants. 
1 P oxia 
Receptacle setose-fimbriate throughout, the hairs exceeding the achen 46. rdia. 
Phyllaries with conspicuous, thin, scarious, colored margins; achenes Pepsin on both Paes vernal ria 
. Ble lennosper 
sik goin: glabrous or nearly so, the phyllaries — usually the leaves dotted or een sh conspicuous im- 
ressed oil-glands; rcak Me ill-smelling; dese 
Heads radiate, etuk or yellow, the disk- 
bristles only, the plants annu 
Annuals; leaves all opposite, ausiee and with a few 
ni 
saviiies yellow; pappus of paleae or of paleae and bristles, if of 
ES 
Oarse setae 
at base. 64. Pectis. 
Perennials or shrubby perennials; leaves mostly stteiate. ‘ootlied & or lobed, lacking coarse setae 
Rays pinkish; phyllaries in 1 serie es with subtending cal nga aaa 65. Nicollet 
s yellow; phyllaries in 2 ser also with — brac 
Ray 66. Dys eg 
Heads discoid, the corollas pre with sac lines; pappus of numerous Se bristles igh pa 
67. 
Porophyllum. 
36. PSILOSTROPHE DC. Prod. 7: 261. 1838. 
Perennial herbs or small shrubs, more or less woolly-tomentose. Leaves alternate, 
li , the margin entire or slightly lobed Inflorescence corymbose, the heads loosely or 
densely arranged. Involucre cylindric, campanulate, or rarely turbinate; the phyllaries 
A genus of 7 or 8 species, natives pela ga United States and Mkt Type species, Hitiiesnhe 
sinbbaiedon? DC. 
1. peenrcetes cooperi (A. Gray) Greene. Paper-flower. Fig. 5314. 
Riddeilia cooperi A. Gray, Proc. Amer. Acad. 7: 358. 1868. 
Psilostrophe cooperi onde Pittonia 2: 176. 1891. 
Plants shrubby, 3-6 dm. high, stems many from the woody base e with ascending branches, 
densely is: ico sn especially on the young grow wth. Leaves mostly linear, narrowed to a short 
petiole, 3- ong, tomentulose, becoming glabrate in age; heads loosely corymbose on the 
upper branches, the peduncles 4-10 cm. long; involucre subcylindric or somewhat spreading, 
6-9 mm. high; phyllaries 10-20, oblong, the outer lanate and firm, the inner thinner ; pistillate 
flowers 4-8, the ligules 8-20 mm. long, pale yellow, papery an d nerved, 
toothed at the Bg disk- flowers ‘somewhat g ranular and glandular, much exserted at anthesis; 
achenes sparsely hairy when young, econuiie’ glabrate, 5-7 mm. long, 13 2 sa -paleae shorter 
or nearly a the achenes, oblong to spatulate, entire or erose-lac 
Gravelly ashes, Sonoran Zones; southern Utah, southern aster and eastern Mojave 
in scare mgs nig ss aoe Eg Loans, 5 oe ap to the Colorado Desert in Riverside and Imperial — 
and also in Lower California, eastward to Arizona and New Mexi Type locality: Fort Mojave. Collected by 
Cooper. May—Sept. 
37. BAILEYA Harv. & Gray ex Torr. in Emory, Notes Mil. Rec. 144. 1848. 
Annual or perennial, densely floccose-woolly herbs, the stems branching from or above 
the base. ves alternate, pinnatifid or bipinnatifid, the upper entire or merely bled 
Heads pedunculate, terminal on the branches, loosely cymose or solitary, radiate; the rays 
yellow, persistent and becoming papery an a reflexed in age. Involucre hemispheric, the 
phy llaries subequal, in 2 series. Receptacle naked, flat or convex. Ray-flowers 
more, pistillate, the ray nerved, broadly eae at the apex or toothed. Disk-flowers many, 
