256 



CARDUACEAE 



Leaves oblanceolate, loosely villous; heads short-peduncled. 2. P. Tagetinae. 



Upper leaves linear or Unear-oblanceolate, glabrate; heads slender-peduncled. 



3. P. sjparsiflora. 

 Stem densely white-pannose. 



4. P. Cooperi. 



1. B. pleniradiata. 



2. B. multiradiata. 



1. M. Stansburii. 



1. P. caudata. 



1. P. oppositifolia. 



1. A. dissccta. 



1. P. intcprifolia. 



2. P. oblongifulia. 



1. H. carnosa. 



1. C. neornexicana. 



1. i/. lenuifolius. 



2. //. tomentosus. 



88. BAILEYA Harv. & Gray. Wild Marigold. 



Plant leafy throughout; annual. 



Plant naked above, almost scapose; biennial. 



89. MONOTHRIX Torr. 



90. PERICOME A. Gray. 



91. PICRADENldPSIS Rydb. 



92. AMAURIOPSIS Rydb. 



93. PLATYSCHKURIA (A. Gray) Rydb. 



stem scapiform or nearly so; leaves firm, oval to lanceolate. 

 Stem leafy; leaves thin, oblong. 



94. HtJLSEA T. & G. 



95. CEPHALOBEMBIX Rydb. 



96. HYMENOPAPPUS L'Her. 



Throat of the corolla campanulate, 1-2 mm. long, not over twice as long as the lobes. 

 Pappus over 1 mm. long, equalling the corolla-tube or nearly so. 

 Stem 3-6 dm. liigh, leafy throughout; heads numeroiLs. 

 Plant sparingly and loosely floccose; leaves glabrate in age. 

 Plant densely tomentose; leaves permanently tomentose. 

 Stem less than 3 dm. liigh. 



Stem-leaves much reduced; stem white-tomentose or nearly so; heads few. 



3. H. scaposus. 

 Stem-leaves not much reduced; stem sparingly grayish-tomentose. 



5. H. cinereus. 

 Pappus 1 mm. or less long, much shorter than the corolla-tube; stem-leaves and heads 

 few. 

 Pappus not hidden by the hairs of the achenes. 



Stem permanently densely wliite-tomentose; achenes silky. 4. H. arenosus. 

 Stem sparingly grajish-tomentose, glabrate in age; achenes loosely villous. 



5. H. cinereus. 

 Pappus hidden by the halts of the achenes, or sometimes none. 



Leaflets glabrate in age, at least above; ultimate segment 5-30 mm. long. 



6. H. fiUfolius. 

 Leaves permanently densely white-tomentose; ultimate segments short, 1-5 



mm. long. 7. H. luleus. 



Throat of the coroUa cylindro-campanulate, 1.5-4 mm. long, 3-4 times as long as the 

 lobes. 

 Pappus equalling the corolla-tube; plant dwarf. 



Heads less than 1 cm. high and broad; corolla-tube 1.5-2 mm. long; stem not 



woolly at the base. S. H. parvulus. 



Heads over 1 cm. high and 1.5 cm. broad; corolla-tube 3-4 mm. long; stem woolly 

 at the base. 

 Bracts more or less rose- or purple-tinged. 9. H. lugens. 



Bracts yellow-tinged. 3. H. scaposus. 



Pappus shorter than the corolla-tube; throat 3-4 mm. long; plant 2^ dm. high. 

 Stem leafy at least half its height, decidedly woolly at the base. 10. H. criopodus. 

 Stem leafy only at the base, not conspicuously woolly. 11. H. macrogloUis. 



97. LEUCAMPYX A. Gray. Wild Cosmos. i. L. Neu-berryi. 



98. OTHAKE Raf. 



Heads radiate: leaves lanceolate to linear-lanceolate. 1. O. sphacclata. 



Heads discoid; leaves narrowly linear. 2. O. macrolepis. 



99. RIGIOPAPPUS A. Gray. l. R. irptodadus. 



100. CHAMAECHAENACTIS Rydb. l. O. scaposa. 



101. CHAENACTIS DC. Morning Brides. 



Annuals. 



Corollas yellow; pappus of minute callous squamellae. 1. C. Nevii. 



Corollas white or flesh-colored; pappus of well developed squamellae. 

 Stamens partly e.xserted; bracts all appressed. 



Involucral bracts acuminate; receptacle usually somewhat bristly. 



2. C. carphocUnia. 



