CLASS IV. 



T E T R A N D R I A, 



ORDER I. 



MONOGYNIA 



A. Flowers superiov. 

 t. Monopetalous, 



103. Cephalanthus. 108. Hedyotis, 



104. DiPSACUS. 109. HOUSTONIA. 



105. Galium. 110. Mitchella* 



106. SpERMACOCE. 111. LiNNAEA. 



107. DioDiA. 112a Sanguisoeba^ 



tt. Polypetalous. 



113. CORNUS. 114. LuDWiGIA. 



ttt. Apetalous, 



115. ISNARDIA. 



B. Flowers inferior^ 

 1. Monopetalous, 



116. PlANTAGO. 119. SWERTIA, 



117. Bartonia. 120. Fraseha. 



118. Exacum.- 121. Obolaria. 



tt. ^-petalle^, 

 122. Ammannia. 123. Ptelea. 



ttt. Apetalous, 

 124. RiviNA. 125. Alchemilla. 



126. Symplocarpus. 



103. CEPHALANTHUS. L. 



Common calyx 0; proper minute, angular, 4-cleft. 

 Corolla tubular, slender, 4-cleft. Style much exserted ; 

 stigma ,^lobose. Capsule 2-celledi 2-seeded, (mostlj; 



