CONTENTS. 



Page. 



Introductory notes - 291 



Commelinaceae - 293 



Setcreaeea an older name than Neotreleasea - 293 



Crassulaceae. ^94 



Four new species of Echeveria and one new name - 295 



Graptopetalum, a new genus 296 



Fifteen new and one restored species of Sedum 297 



New species of four genera 301 



Menispermaceae 302 



A new species of Menispermum 302 



Caesalpiniaceae - 303 



New species and new binomials in Poinciana 303 



Oxalidaceae 303 



New and recently described species of Ionoxalis 303 



Polygalaceae 307 



Two new species and a new name in Polygala 307 



Malvaceae 307 



Erioxylum, a new genus 307 



Cactaceae - 308 



A new species of Ariocarpus from Mexico 308 



Notes and descriptions of North American species of Opuntia 309 



Apiaceae 311 



A new Arracacia and a new Eryngium 311 



Ericaceae ° 



A new species of Arbutus 312 



v 



