310. 148. COMPOSITAK 



n. Marginal'flowers female, with thread-shaped corollas. 



18 LAGGERA. 



All flowers alike with corollas 5 cleft. 2 VERNONIA. 



78. Style branches long, blunt semicylindrical, hairy in upper part 



on both sides. Flowers all hermaphrodite, red, blue, or 



white. Leaves opposite. 79. 



Style branches rather flat, scantily hairy on inner surface or 



flowers yellow, or partly female, or leaves alternate. 81. 



79. Anthers without an apical appendage. Pappus of 3 — 5 bristles. 



3 ADENOSTEMMA. 



Anthers with an apical appendage. Pappus of numerous 



bristles or of scales. 80. 



80. Pappus of 5—10 scales. Herb. 4 AGERATUM. 

 Pappus of numerous bristles. Climber. 5 MIKANIA. 



81. Style branches with short subequal hairs on upper part, on 



outer, rarely inner surface. 82. 



Style branches bearing a crown of long hairs, with or without 



shorter ones above or below, or above and below. 92. 



82. Corolla of marginal flowers present, but very short, not over- 



topping involucre. 83. 



Corolla of marginal flowers overtopping involucre or wanting. 



87. 



83. Pappus wanting, rarely a few minute bristles on central fruits. 



6 DICROCEPHALA. 



Pappus present consisting of long bristles. 84. 



84. Female flowers in 1 row. Pappus deciduous. Shrubby plants. 



12 NOLLETIA. 

 Female flowers in 2 or more rows. 85. 



85. Corolla of marginal flowers strap-shaped, but shorter than 



style, or thread-shaped. 11 CONYZA. 



Corolla of marginal flowers strap-shaped, but longer than 



style. 86. 



86. Ray flowers yellow. 10 NIDORELLA. 

 Ray flowers red or white (see 71). 9 ERIGERON. 



87. Involucral bracts in 1 row or 2 very unequal rows. 



64 GYNURA. 

 Involucral bracts in 2 subequal or 3 or more rows. 88. 



88. Ray flowers yellow or wanting. 89. 

 Ray flowers red, blue or white. 90. 



89. (a) Pappus bristles in 1 row. Fruits compressed. 



13 CHRYSOCOMA. 



(b) Pappus bristles in 1 row. Fruits turgid. 



13aPENTHERIELLA. 



(c) Pappus bristles in 2 or 3 rows. 14 HETEROMMA. 



