CONTENTS. 





Page. 



Studies op Tropical American Ferns — No. 2. By William R. Maxon 1 



Introduction 1 



Notes upon ferns recently collected in Guatemala by Baron von Turckheirn, 



"with descriptions of several new species 1 



The bipinnate species of Cyathea 23 



A revision of the West Indian species of Polystichum 25 



Descriptions of new species 39 



Miscellaneous notes 42 



Three New Species of Echeveria from Southern Mexico. By J. N. Rose 



and C. A. Purpus 45 



The Grasses of Alaska. By F. Lamson-Scribner and Elmer D. Merrill... 47 



Introduction 47 



Systematic treatment 49 



Bibliography 91 



New and Noteworthy Plants from Colombia and Central America,— 



No. 2. By Henry Pittier 93 



Magnoliaceae 93 



The Costa Rican species of Talauma 93 



Euphorbiaceae 94 



Corrections and addenda to "The Mexican and Central American 



species of Sapium " 94 



Asclepiadaceae 96 



New or interesting species 96 



The true place of some supposed Ensleniae from Mexico and Central 



America 109 



The species of Oxypetalum of the cordifolium group Ill 



Solanaceae 116 



Two new species of Cyphomandra from Colombia 116 



Cucurbitaceae 118 



A new species of Cayaponia and two of Anguria 118 



The Costa Rican species of Cyclanthera and some related plants 120 



Cyclanthera 120 



Elateriopsis 124 



Frantzia, a new genus 127 



Polakowskia, a now genus 131 



Relationships of the Ivory Palms. By O. F. Cook 133 



Historical opinions 133 



Comparison of essential characters 136 



Description of the Phytelephantaceae and allied families 139 



The TyrE Localities of Plants First Described from New Mexico. By 



Paul C. Standley 143 



Introduction 143 



Itineraries of early collectors 147 



Descriptive list of type localities 151 



Explanation of the maps 174 



Systematic list of plants 175 



List of now binomials 227 



IX 



