250 ASTER ORDER 



(b) Flowers yellow ; pappus of narrow scales 

 x. Bracts of involucre in 1 row ADOPOGON 



y. Bracts in 2 or more rows 



(x) Pappus scales tipped with a plumy 



bristle PTILOCALAIS 



(y) Pappus scales bristle-like NOTHOCALAIS 



c. Pappus of hair-like bristles which are not 

 plumose 



(1) Pappus in 2 rows, the inner deciduous 



and falling together, the outer 1-8 and 



persistent MALACOTHRIX 



(2) Pappus persistent or the bristles falling 



separately 



(a) Flowers rose to purple 



x. Stems annual, 4-8 in. high PRENANTHELLA 



y. Stems perennial usually a foot or more 



high 



(x) Leaves few or none LYGODESMIA 



(y) Leaves many PRENANTHES 



(b) Flowers yellow, blue or white 

 x. Stems leafless ; heads solitary 



(x) Achenes spiny-warted about the top TARAXACUM 

 (y) Achenes not spiny-warted AGOSERIS 



y. Stems leafy ; heads usually several-many 

 (x) Achenes flattened 



m. Achenes broad at top, not beaked SONCHUS 



n. Achenes narrowed at top or beaked LACTUCA 

 (y) Achenes not flattened 



m. Pappus white CREPIS 



n. Pappus not white, dark or brown- 

 ish HIERACIUM 



ADOPOGON Necker 1790 GOATSBEARD 



(Gr. hados, pleasing, pogon, heard) 



(Krigia Schreber) 



Heads with yellow or orange perfect strap-flowers, achenes oblong, 

 ribbed, pappus of an outer row of 10-15 scales and an inner row of hair- 

 like bristles ; receptacle flat, without chaff, involucre bell-shaped, bracts in 

 1-2 rows ; heads solitary ; leaves alternate or basal, entire to pinnatifid ; an- 

 nual or perennial. 

 Stems 1-2 ft. high, 1-leaved ; heads about 1.5 in. wide A.virginicus 



