Dicotyls or Exogenous Plants. 119 



d. Rays yellow, disk dull brown Rudberkia. 'i 



d. Rays white e . 



e. Receptacle chaffy ; heads small, the rays few AchiUea. 4 



e. Receptacle not chaffy except at summit : heads rather large Anthrmis. "> 



e. Receptacle naked, rays many : heads large Clirysanthetmim. (> 



f. Leaves all radical ; heads solitary- on scaly scapes Tussilago. 7 



f. Leaves not all radical ; heads corymlied Senecio. S 



1. Genus ER-IG'-ER-ON. — Heads man3'-flowered, radiate, mostly 

 flat or hemispherical, the narrow rays very numerous; involucral 

 scales narrow, equal and little imbricated; achenes flattened; pappus 

 a single row of capillary bristles. 



A. Rays white. 



Er-ig'-er-on an'-nu-us (L.) Pers. Daisy Fleabane. — Stem beset with 

 spreading hairs; leaves coarsely and sharply toothed, the lowest ovate, 

 the upper ovate-lanceolate. 



Er-ig'-er-on ra-mo'-sus (Walt.) B. S. P. [E. strigosus Muhl.) Daisy 

 Fleabane. — Roughish, with minute appressed hairs, or almost smooth ; 



leaves entire or nearly so, the lowest oblong or spatulate, the upper 

 lanceolate. 



A. Rays purp/isli or flesh-color. 



Er-ig'-er-on pul-chel'-lus Mx. {E. bellidifolins Muhl.) Robin's Plan- 

 tain. — Stem simple, rather naked above, bearing few (1-9) large heads; 

 rays about ■')(), rather broad, light bluish-purple. 



Er-ig'-er-on phil-a-del'-phi-cus I^. Common Fleabane. — Stem leafy, 

 corymbed, having several small heads; rays innumerable and very 

 narrow, rose-purple or flesh-color. 



'1. Genus AN-TEN-NA'-RI-A. — Heads many-flowered, dioecious; 

 flowers all tubular; involucre dry and scarious; achenes terete or 

 flattish ; leaves entire, heads corymbed, rarely single. 



An-ten-na'-ri-a plan-ta-gin-i-fo'-li-a (L.) Rich. Everlasting. — Low, 3-18 

 in. high, spreading by off'sets and runners. 



3. Genus RUD-BECK'-I-A. — Heads many-flowered, radiate; scales 

 of the involucre leaf-like, in about 2 rows, spreading; chaff short, con- 

 cave; achenes 4-angular, flat on top. 



Rud-beck'-i-a hir'-ta L. Cone-flower.— Very rough and bristly-hairy 

 throughout; heads large; leaves nearly entire. 



O /. 



