OiiDEii 70.— ASTERWORTS. 233 



c Heads small, rays few (2-15) d 



c Heads quite liir^re, rays narrow, about 30. Tall. c. Elecarhpane. In'ula. 

 d Pappus scaly, very short. Koot Ivs. cordate. Eays 4 or 5. S. Brachtch^'ta. 

 d Pappus abundant bristly hairs. Root Ivs. not cordate. Goldenrod. Solida''go. 1 

 d Pup. of a single row of equal bristly hairs. Ped. long, slender. S. Isopap'pcs. 



e Involucre about 4-rowed. Rays 20-30. Head solitary. S. Baldwin'ia. 



e Involucre about 2-rowed. Rays 8-10. Heads corynibed. S. A()tinosper''mi:m, 

 £ Ray florets pistillate. Leaves decurrent. Sneezeivoti. Hele''nium. 



f Ray florets neutral. False Sneezeuort. Leptop''oda. 



g Fruit (achenia) 4-angled. Heads large, showy. Cone-flower. Rudbeck'ia. 



g Fruit flattened, winged. Heads showy. Rays droop. W. S. Lep'achys. 

 h Achenia wingless. Pappus of 2 deciduous scales. Sunflower. Helian'thus. 2 

 h Achenia winged. Pappus of 2 persistent awns. Lvs. often decurrent. W. 



Eag-Sunfloiver. Actinom'eris. 



k Achenia wingless, in more than 1 row. Coarse herbs with large heads. 



M. W. Leaf-cup. Sil'phium. 



k Ach. winged, in only 1 row. Small, with middling lids. S. Bkrlandie'ra. 



m Stems leafy, erect, about 2f. (or l-3f.) high n 



m Stemless plants, leaves radical, appearing after heads. CoW 8-foot. Tcssila^go. 



n Scales 5, united in 1 row. Leaves pinnate, French Marigold. Tage''tes. 



n Seal, in 2 rows, the out. united. Lvs. pinn. W. S. False Dog -fennel. Dyso'dia. 



n Scales in 1 or 2 rows, all distinct. AV. S. Arnica. Ar'nica. 



o Involucre imbricated in 3 or more rows of scales. Sunflower. Helian^thus. 2 



o luvol. 2-rowed. Pappus of downwardly hispid awns. Burr. Marigold. Bi'dens. 3 

 o Invol. 2-rowed. Pappus upwardly hispid if at all. Tick Sunflower. Coreop'sis. 4 



p Achenia wingless. Rays .5-12. Herbs viscid, 2-lOf. high. S. Poltm'nia. 



p Achenia wingless. Rays 5. Herbs 2-10'' high, at first stemless. Flowers 

 early in Spring. W. S. Chrysog'onum. 



p Achenia broadly winged. Rays 12-25. Coarse, tall herbs. M. S. W. 



Eesin W^ed, Polar Plant. Sil''phium. 

 q Herbs 3-6f. high. Rays 1-5. Reccpt. flat. S.-W. Grown Beard. Verbesi^na. 

 q Herbs 2-3f. high. Rays 6-9. Receptacle convex. S.-W. Tetragonothe^ca. 

 q Herbs 2-6f. high. Rays 10-15. Recept. conical. False Sunflower. Heliop'sis. 

 q Shrubs 3-lOf. high, with solitary heads. S. BoRRicn''iA. 



r Ach. very silky, biggest at top. Rays about 5. False Aster. Sericocar''pus. 



r Achenia smooth or smoothish, flattened. Rays 6-100. Starwort. Aster. 5 

 s Wild plants l-4f. high, with middle-sized heads (about I'' broad). Diplopap'pus. 

 s Garden plants l-2f high, with very large heads. China Aster. Callis'tefhus. 



t Herbs 2-3f. high, very smooth. Leaves lanceolate, entire. W. Bolto'nia. 



t Herbs i-9f high, hairy or rough. Rays 20-200. White-weed. Ekig'eron. 

 u Involucre broad and flattish. Pappus 0. Rays white. Ox-eye. Leucan''themum. 

 u Involucre hemispherical. Pappus a membranous margin. Cult. Pyre'thuum. 

 a Involucre hemispherical. Pappus 0. Lvs. lobed. Cultivated. CnRYSAN''TnEMUM. 

 u Inv. bell-shaped. Pappus 0. Lvs. entire. Rays violet-purp. W. f Daisy. Bel'us. 



