CHRYSOPSIS— CHRYSOTHAMNUS ^65 



flat to hemispheric without chaff, involucre hemispheric, bracts imbricated 

 in several rows; heads usually solitary on long stalks; leaves alternate, 

 coarsely toothed or ci t ; annual or perennial. 



Stems 1-3 ft. high; stem-leaves linear-spatulate, 1-3 in. C.leucanthemum 

 long; rays 20-30 



Chrysopsis Nuttall 1818 Golden Eve, Golden Aster 



(Gr. chrysos, golden, opsis, look, from the color) 



PL 38, fig. 7. 



Heads with yellow pistillate ray-flowers, disk-flowers yellow, usually 

 perfect, achenes flattened, linear-oblong to obovate, pappus double, inner 

 row of hair-like bristles and the outer of smaller scales or bristles ; re- 

 ceptacle flat, without chaff, involucre hemispheric to bell-shaped, the bracts 

 imbricated in several rows ; heads solitary or corymbose on the branches ; 

 leaves alternate, sessile, entire or toothed ; perennial. 

 Stems 4 in. to 2 ft. high; leaves lance-linear to spatu- 

 late or nearly ovate, 1-8 cm. long, bristly, shaggy 

 hairy or sticky; heads 1-2 cm. wide, sessile or vari- 

 ously stalked C. villosa 



Chrysothamnus Nuttall 1840 Golden Bush, False 



Golden Rod 



(Gr. chrysos, golden, thamnos, bush) 



Heads without rays, the disk-flowers yellow or cream -colored, perfect, 

 achenes oblong to ovoid, pappus of hair-like bristles ; receptacle without 

 chaff, involucre oblong to cylindric, the bracts imbricated in several rows, 

 often in distinct vertical ridges, usually stiff and papery ; heads in racemes, 

 panicles or cymes; leaves alternate, entire, spatulate to linear; shrubs, or 

 becoming shrubby. 



1. Bracts more or less long-pointed 

 a. Achenes hairy ; bracts not in ridges 



(1) Outer bracts long-tapering, some usually 

 exceeding the flowers, and leaf-like ; 

 heads in a long leafy spike- or raceme- 

 like cluster 



(a) Heads 10-15-flowered ; bracts about 12; 



leaves lance-linear C. Pdrryi 



(b) Heads 5-flowered ; bracts 15-18; leaves 



narrowly linear m C. HSwardii 



