B. ODONTOCAEPA — Dwarf ; leaves mostly opposite, very narrow, equally green ; umbels solitary ; 

 staMets very short ; calyx-tube 4-toothed, lid patellar ; fruit small, hemiellipsoid, border 

 compressed, valves enclosed. 



B. E0DESMIOIDBS. — Dwarf ; leaves opposite or scattered, rather narrow, equally green ; umbels 

 solitary ; stalk slender, stalklets very short ; calyx-tube almost toothless ; lid patellar ; stamens 

 forming four bundles ; fruit truncate-ovate, border compressed, valves enclosed ; seeds membra- 

 nously margined. 



E. TETRAGONA. — Dwarf ; leaves thick, opposite, broad, equally whitish-grey; umbels solitary; 

 stalk compressed ; calyx-tube slightly 4-toothed ; lid patellar ; stamens forming four bundles ; 

 fruit rather large, truncate-ovate, -angular, border compressed, valves enclosed ; seeds much 

 membranously margined. 



E. EBYTHBOCOEYS. — Dwarf ; leaves thick, elongated, mostly opposite, equally gveen ; umbels Soli- 

 tary or flowers single ; stalk compressed, stalklets none ; calyx-tube quadrangular, slightly 

 4-toothed ; lid depressed, red; stamens forming four bundles, filaments yellow; fruit very large, 

 bellshaped-hemispheric, border very broad, somewhat ascendant, valves barely enclosed. 



The characteristics of aberrant forms of any species are not covered by this synopsis. 



