84 .BULLETIN QF THE 



Barbarea praecox, April 7, 1874. 

 Sisymbrium Alliaria, April 7, 1878. 

 Viola cucullata, April 7, 1878. 

 Viola striata, April 7, 1878. 

 Viola glabella, April 7, 1878. 

 Ionidium concolor, April 7, 1878. 

 Silene, Pennsylvania, April 7, 1878. 

 Cerastium vulgatum, April 7, 1878. 

 Cerastium oblongifolium, April 7, 1878. 

 Geranium, maculatum, April 7, 1878. 

 Oxalis corniculata, April 7, 1878. 

 Cercis Canadensis, April 7, 1878. 

 Potentilla Canadensis, April 7, 1878. 

 Tbaspium trifoliatum, April 7, 1878. 

 Cornus florida, April 7, 1878. 

 Chrysogonum, Virginianum, April 7, 1878. 

 Senecio aureus, April 7, 1878. 

 Fraxinus viridis, April 7, 1878. 

 Phlox divaricata, April 7, 1878. 

 Litbospermum arvense, April 7, 1878. 

 Betula nigra, April 7, 1878. 

 Populus monilifera, April 7, 1878. 

 Arisaema tripbyllum, April 7, 1878. 

 Erythronium albidum, April 7, 1878. 

 Trillium sessile, April 7, 1878. 



My special observatious on the vernal flowering time of plants 

 extend about two weeks later or to the end of the third week in 

 April, after which the great number of plants in bloom, iucluding 

 the amentaceous trees, render it difficult to pursue the investigation, 

 while at the same time the facts become less valuable. The results 

 for the second and third weeks of April, always excluding all pre- 

 viously enumerated, are as follows : 



Arabis lyrata, April 9, 1876. 

 Fraxinus pubescens, April 11, 1880. 

 Salix cordata, April 11, 1880. 

 Salix purpurea, April 11, 1880. 

 Vaccinium corymbosum, April 12, 1880. 

 Carex platyphylla, April 12, 1880. 

 Poa annua, April 12, 1874. 



