Two adventive species unrecorded from the Bahama Islands 



L. J. K. Brace 



1. Thlaspi arvense L. A single specimen recently found in a 

 garden and for the first time definitely observed on New Provi- 

 dence: abundantly fruiting. Whether sprung directly from Eu- 

 rope or via the United States or Bermuda I suppose it profitless 

 to speculate. Evidently climatic reasons alone in the future will 

 control indiscriminate mixing of Floras. 



2. Holcus halepensis L. This was observed growing in clumps 

 in a small lot, on New Providence; after being uprooted, it soon 

 re-established itself. 



Nassau, New Providence 



BOOK REVIEWS 

 A New Handbook of Trees 1 



Dr. Graves and Miss Rusk of the Brooklyn Botanic Garden 

 have published a small book that will be much appreciated by 

 all those interested in the trees and shrubs of our region. It is 

 unique in including both wild and cultivated trees and shrubs 

 and in describing both winter and summer characteristics. The 

 book contains two complete keys to genera, one based on the 

 summer characters, the other on the winter characters. There 

 are concise but complete descriptions of all the woody plants 

 commonly found in the New York region, with directions as to 

 where the more uncommon ones may be seen. Technical terms 

 have been largely avoided, a glossary at the end of the book 

 gives explanations of those it was necessary to use. 



The book has grown out of the courses on trees which Dr. 

 Graves has been giving at the Botanic Garden for a number of 

 years. Written to meet the known need of his students it will 

 be found useful to all botanists and nature lovers at all times 

 of the year. While written for the New York area, the trees and 

 shrubs described include nearly all those to be found in the 

 north-eastern United States and so should have an appeal well 

 beyond the limits of the city area. The book is bound in paper 

 and very moderately priced. 



George T. Hastings 



1 A teaching guide to the Trees and Shrubs of Greater New York, Arthur 

 H. Graves and Hester M. Rusk. 



162 



