164 SUMMER FLOWERS. 



unequal scales ; fruit plano-coiupressed, truncate above, 

 not beaked. 



(172) Crepis — involucre double, the inner of one row, the outer 



of short lax scales ; fruit terete, narrowed upwards, or 

 obscurely beaked. 



tttt Pappus stalked. 

 % Pappus Itj, two rows. 



(173) HypochcBris — involucre oblong, imbricated ; receptacle 



scaly; fruit glabrous, muricated, often beaked. 



;|;;|; Pappus in many rows. 

 § Pa'ppus feathery. 



(174) Helminthia — involucre of eight equal scales, in one row, 



surrounded by three to five loose leafy bracts ; receptacle 

 dotted ; fruit compressed, transversely rugose, rounded at 

 the end, and with a slender beak longer than itself. 



(175) Tragopogon — involucre simple, of eight to ten scales con- 



nected at the base ; receptacle punctured ; fruit longitu- 

 dinally striated, with a long beak. 



§§ Pappus Jiair-like. 



(176) Lactuca — heads few-flowered ; involucre imbricated, in two 



to four rows, the outer row shorter, the scales with a 

 membranous margin; fruit piano-compressed, contracted 

 and produced into a filiform beak. 



(177) Barkhausia — heads many-flowered ; involucre double, the 



inner of one row, the outer of short lax scales ; fruit terete, 

 all (or the inner ones only) gradually contracted into a 

 long beak. 



34. Lobeliaceous Plants. Lobeliace.e. 



(178) Lobelia — corolla very irregular, split open on the upper 



side ; anthers closely cohering. 



