200 45. COMPOSITE. 



41. HELMINTHIA. Phyll. in 1 row, equal, -with equal subu- 

 late adpressed ones at the base, and surrounded by 3 5 

 leajiike loose bracts. Fr. compressed, transversely rugose, 

 rounded at the end and imth a slender beak longer' than the 

 fruit. Pappus in several rows, feathery. 



Pappus filiform, deciduous, never feathery nor dilated at 

 the base. JReceptacle generally without scales. Fruit com- 

 pressed. 



42. LACTUCA. Heads few-flowered. Phyll. with a mem- 

 branous margin, imbricate in 2 4 rows ; outer row shorter. 

 Fr. plane compressed, contracted and prolonged into a fili- 

 form beak which is neither crowned nor rnuricate. 



43. TARAXACUM. Heads many-flowered. Inv. double ; inner 

 phyll. in 1 row, erect ; outer few, short, lax or adpiessed, 

 imbricate. Fr. subcompressed, nmricate and suddenly con- 

 tracted above, prolonged into a filiform beak. 



44. SOKCHUS. Heads many-flowered. Phyll. imbricate in 

 2 or 3 rows, unequal. Fr. plane compressed, truncate, not 

 beaked. 



45. MULGEDIUM. Heads many-flowered. Inv. double; inner 

 phyll. in 1 row ; outer short, lax, imbricate. Fr. compressed, 

 constricted above, and ending in a ciliate disk. Outer rows 

 of the pappus rigid and brittle. 



****** Fruit terete, ribbed. Otherwise like the preceding section. 



46. CBEPIS. Heads many-flowered. Inv. double ; inner 

 phyll. in 1 row; outer short, lax. Fr. terete, narrowed 

 upwards or beaked. Pappus soft. 



47. HIEBACIUM. Heads many-flowered. Phyll. imbricate, 

 many, oblong. Fr. truncate, not beaked, with a very short 

 crenulate margin. Pappus brittle. 



[Anomalous Genus. Order AMBROSIACE^: Link.] 



[48. XANTHITJM. Heads monoecious. Male : inv. of 1 row 

 of free ph^ll., many-flowered. Receptacle scaly. Cor. 

 funnelshaped, 5-cleft. Anth. free. Stigma blunt, entire. 

 Fern. fl. 2, enclosed within the inv. which ends in 1 2 

 beaks, is covered with hooked spines, and hardens over the 

 fruit. Cor. 0. Stam. 0. Stigmas 2, diverging, linear. 

 Fr. compressed, each occupying a cell in the involucre.] 



