KEY TO PLATE XL 



No. i. Three-lqbeu Butter- bur 

 (Bidens tripartite L.) 



a, Tubular o: disk flonet, 

 with a cbenc I>el6w^_afld 

 barbeH pappus bristles, -with 

 Scale.- i*, Receptacle, 



outer 

 and 



No. 3. liuuerbur 



(Petasitcs evatus, H^offi- 



dnalis, Mcench.) 



a, Tubular floret, withachene 

 aud pappus, b. Leaf. (> 



pappus. 



Scape, with bracts <&>%* 

 flowerhead (female-) forming a 



and 



or ray floret, with 

 achenc and pappus be 

 b, Tubular or tidi floret, c. 

 \AcheneJ jwithl I /pappus, d, 

 'Leaf, i Flowe^ead closed 

 nd dropping, and expanded, 

 scapte with leafy scales. 

 Scatej, fvith !h/>vferhead in 

 it sbbw ng pappus, form- 



(Settee io ayuafu-us, Hill..) 



cherie/ ydith pappus. 



Upper part of plant,, 



pinnate leaves, and fi 



heads in 1 a corymb. 



1 AAX V s ; 



a, Tubular floret, with achene 

 and pappus. t> t Feathery 

 pappus. i, Acheitc, with 

 pappus, a, Upper part; of 

 plant, with winged bnfcily 

 stern and leaves, ami flower- 



JU<# 



a, b, Corolla (rotate), with 

 stamens with filaments con- 

 nate below, large and small 

 form, f, Upper part of plant, 

 with upper opposite stem- 

 leaves, and flowers in a pani- 

 / cl'ed cyme, showing various 

 stages, with stamens exserted 

 m some. 



