222 THE FLORA. 



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



c Heads quite large, rays narrow, about 30. Tall. c. Elecampane. In'cla. 

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

 d Pappus abundant bristly hairs. Eoot Ivs. not cordate. Goldenrod. Soliua'go. 1 

 d I'ap. of a single row of equal bristly hairs. Ped. long, slender. S. Isopap''pus. 

 e Involucre about 4-rowed. Kays 20-80. Head solitary. S. Baldwin''ia. 

 e Involucre about 2-rowed. Eays 8-10. Heads corymbed. S. Actinosper'mum. 

 f Kay florets pistillate. Leaves decurrent. Sneezewort. Hele'nium. 



f Kay florets neutral. False Sneezewort. Leptop''oda. 



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

 g Fruit flattened, winged. Heads showy. Eays 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. 



Rag-Sunflower. Actinom''ekis. 

 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 hds. S. BePvLandie'ka. 



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



m Stemless plants, leaves radical, appearing after heads. GoWs-foot. Tussila''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. FaUo. Dog-fennel. Dyso'dia. 

 n Scales in 1 or 2 rows, all distinct. W. S. Arnica. Ar^nica. 



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



o Invol. 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. Eays 5-12. Herbs viscid, 2-lOf. high. S. Polym'nia. 

 p Achenia wingless. Eays 5. Herbs 2-10^ high, at first stemless. Flowers 



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



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



Resin Weed., Polar Plant. Sil'phium. 



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



q Herbs 2-3f. high. Eays 6-9. Eeceptacle convex. S.-W. Tetragonothe'ca. 



q Herbs 2-6f. high. Eays 10-15, Eecept. conical. False Sunflower. Heliop'sis. 



q Shrubs 3-lOf. high, with solitary heads. S. Borrich''ia. 



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



r Achenia smooth or smoothish, flattened. Eays 6-100. Starwoj't. Aster. 5 



s "Wild plants l-4f. high, with middle-sized heads (about 1'' broad). Diplopap''pus. 



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



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



t Herbs i-9f. high, hairy or rough. Eays 20-200. White-weed. Ehig'eron. 6 



u Involucre bread and flattish. Pappus 0. Eays white. Ox-eye. LEucAN''THEMtJM. 



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



a Involucre hemispherical. Pappus 0. Lvs. lobed. Cultivated. Chrysan'themum. 



u Inv. bell-shaped. Pappus 0. Lvs. entire. Kays violet-purp. W. + i)ai5y. Bel'lis. 



