Okdbr 70.— LIGULIFLOR^. 223 



V Disk florets yellow, perfect. Eays pistillate. - Camomile. Akthem'is. 



V Disk florets yellow, perfect. Eays neutral. May-weed. Maru'ta. 



V Disk florets white, perfect. Eays pistillate. Yarrow. Aohil'lea. 7 

 w Eays short, white, 3 or 4. W. S. Grotim-beard. VEEBESifNA. 

 w Eays very short, white, 5, ear-shaped. W. M. PAETiiE'Nmii. 

 w Eays very large, purple, pendulous." Purple Gone-jlower. Eohina'cea. 



X Leaves pinnately divided. Inner involucre of 8 united scales. + Dah'lia. 



X Leaves simple. Eeoeptacle conical with large ohaflf. + Zin'nia. 



X Leaves simple. Eeceptaole flat. Eays rose-color. Tioh-seed. Coeeop'sis. 4 



X Leaves simple. Eeceptaole flat. Eays white, short. W. Eclip'ta. 



y Heads in corymbs. Disk florets regularly 5-toothed. ■/-. Naedos'mia. 



y Heads solitary. Disk florets regularly 5-toothed. S. Daisy. Bel'lis. 



y Hds. solitary. Disk flts.-2-lipped, outer lip 3-toothed, inner 2. S. Chapta'lia. 



Sub-order Second, LIGULIFLOE^, 

 having all the florets ligulate (§ 96) and perfect, i. e., the heads radiant. 



2 Flowers hright yellow 3 



2 Flowers cream-color or purplish 5 



2 "iFlowers blue. Stems leafy, erect . . . . e 



8 Pappus r(one. Involucre of about 8 equal scales a 



3 Pappus double, the outer of scales, inner of bristles b 



8 Pappus wholly of feathery bristles f 



8 Pappus wholly of hair-like bristles, generally abundant. . . .4 



4 Fruit bearing the pappus on its slender beak c 



4 Fruit not lengthened into a beak, pappus sessile d 



5 Pappus consisting of equal, feather-like bristles.. . . .f 



5 Pappus of simple, hair-like bristles, abundant g 



a Leaves all alternate. Heads panicled. r. JSfipplewort. Lampsa^na. 



a Leaves partly opposite. Heads solitary or umbeled. Pappus 0. S. Apo'gon. 



b Leaves all radical, pinnatifld-toothed. Pappus scales 5, with 



5 bristles, c. Swarf DandeUon. Keio'ia. 



b Lvs. all or mostly rail., seldom pinn. Pap. seal, and brist. many . Cyn'thia. 

 c Stemless leaves runcinate. Pappus white. Dandelion. Tasax'aodst. 8 



o Stems leafy or not. Pappus reddish or tawny. S. Ptekhopap'pus. 



c Stems leafy, leaves runcinate. Pappus silky-white, c. Lettuce. Lactd'ca. 



d Pappus brownish. Stems mostly leafy, with many heads, c. 



Hawkweed. Hieba'oidm. 9 



d Pap. silky white. Stemless ; scapes each with one head. W. Teox'imon. 



d Pappus silky white. Stems bear prickly leaves, c. Sow Thistle. Son'ohhs. 

 e Pappus of many small scales. Branched stems 2f. high. Hdads axillary, 



large. Common. Eastward. Succory. Cioho'ridm. 



e Pappus of many hair-like bristles. 3-8f. Bhie Lettuce. Mdlge'dium. 



f Leaves on the stem linear, entire. Purpl. t Vegetable Oyster. Tkagopo'gon. 



f Leaves all radical, toothed. Flowers yellow. Fruit taper-beaked. 



Hawlcbit. Leon'todon. 



