the full distributional extent or limits. The plants are, ap- 

 parently, doomed to extermination in the near future, not only 

 by reason of the destruction wrought in their natural environ- 

 ment, but also because further artificial development of the 

 locality is inevitable, and it is hopeless to expect that the native 

 vegetation will receive any consideration. 



Through the courtesy and skill of Mr. H. C. Hartmann 

 excellent photographs were secured of a group of the plants in 

 mass, and also of certain individual plants, as may be seen from 

 the accompanying plates. 



New York Botanical Garden. 



Explanation of Plates 



Plate A 

 A group of nine plants of Isotria verticillata at Annadale, Staten Island, 

 N. Y. . . 



Plate B 

 Individual plants at the same locality 



Figure 1. A flowerless and a flowering plant — the latter showing the 

 flower in profile. 



Figure 2. A plant showing front view of the flower. 

 Photographs by Mr. H. C. Hartmann. 



Note. Since writing the above I again visited the locality, on June 10, 

 and found a large section of the woodland destroyed by a brush fire. The 

 fire had, fortunately, stopped when it had eaten its way to about the middle 

 of the Isotria zone. Had it gone twenty feet further every plant would have 

 '^een exterminated. — A. H. 



Flower Structures of Dicotyledons 



Alfred Gu'ndersen 



The semi-diagrammatic representations opposite are in- 

 tended to indicate in a condensed form varied floral characters; 

 Amentiferae are omitted. 



Probable lines of evolution of the characters shown may 

 be briefly summarized. 



Carpels and seeds 



from separate to partly united, to wholly united; 



70 



