142 KEY TO PLANTS. 
ous. Herbs. Flowers in heads. An- 
thers more or less coherent. Seed al- 
buminous. South America. Calycereae. 
(0) Style in the fertile flowers 2-fid at the 
top. Ovule erect. 109. 
109 (2) Anthers free. All flowers furnished with 
a corolla. Seed albuminous. Leaves 
opposite or verticillate. Rubiaceae. 
(4) Anthers coherent, rarely almost free, but 
then female flowers destitute of a corolla. 
Seed exalbuminous. Flowers in heads, 
surrounded by a common involucre; 
rarely the heads reduced to single 
flowers. Compositae. 
110 (a) Perfect stamens as many as corolla-lobes. 
1, 
(0) Perfect stamens fewer than corolla-lobes. 
118. 
111 (a) Ovaries 2, distinct. Style 1, stigmatose 
below the top only. A pocynacede. 
(4) Ovary 1, entire. 112. 
112 (a) Leaves opposite or verticillate. 113. 
(6) Leaves alternate or (all) radical. 115. 
113 (2) Stamens free from the corolla or (if in- 
serted on it) both filaments and anthers 
connate. Leaves exstipulate. Ovules 
more than 2 in each cell. Campanulaceae. 
(6) Stamens inserted on the corolla, distinct, 
re , 
