164 SUMMER FLOWERS. 



unequal scales; fruit piano-compressed, 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. 

 J Pappus in two rows. 



(173) Hypochceris involucre '. oblong, imbricated ; receptacle 



scaly; fruit glabrous, muricated, often beaked. 



JJ Pappus in many rows. 

 Pappus 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 hair-Wee. 



(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^. 



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



side ; anthers closely cohering. 



