DERIVATION OF THE FLORA AND FAUNA 407 



polystacliyus Rottb. Trop.-subtrop., widespread. 



cylindrostachys Boeck. As the former. 



brcfifolius (Rottb.) Hassk. Pantrop. 

 ScirpKS L. 



riparius Presl. X. Amer., Calif, to S. Amer., south to Fueg., Falkland. I can- 

 not find that var. paschalis Kuekenth. deserves to be distinguished. 



Juncaceae. 

 Jiinais L. 



plebehis R. Br. Colomb.-Urug., .Austral., Tasm., X. Zeal. 



Piperaceae. 

 Pepero))iia Ruiz et Pa v. 



reflexa Dietr. I'antrop., very widespread, north to Hawaii and south to 

 X'. Zeal.; also on Rapa and possibly Pitcairn. 



Chenopodiaceae. 

 Chenopodhtni ambigmim R. Br. Austral., Tasm., X. Zeal. 



Polygonaceae. 

 Polygomim L. About 150, world-wide. 



acuminatnin H. B. K. W. Ind., Centr. and .S. Amer., Galap. Is., trop. and 

 S. Afr., Orient. 



Nyctaginiaceae. 



BoerJiaavia L. About 20. Pantrop. 



diffusa L. Widespread in the Pacific and a common weed in the Old and 

 Xew World; probably of aboriginal introduction. 



Aizoaceae. 

 Tetragonia L. 



expansa Murr. 



Cruciferae. 



Xasturtiuin R. Br. About ;o. Widespread, mosth' temp. 

 sanuoitosuin (Sol.) O. E. Sch. Austral. -Polyn., Hawaii. 



Leguminosae. 



Caesalpinia L. At least 90-100; pantrop. 



bo7iduc (L.) Roxb. Trop. As.-Polyn. 

 Sophora L. 



toromiro (Phil.) Skottsb. Xearly related to the species from J. Fern. 



Euphorbiaceae. 

 Euphorbia L. 1 500-1600; world-wide. 



kiria L. Indomal. -Polyn., often adventitious. 



serpefis L. As the former, also common in trop. Amer. 



