FLORA OF WASHINGTON AND VICINITY. 29 



Salix tristis March 17, 1877 



Populus grandidentata March 21, 1880 



Corydalis flavula March 22, 1874 



Thalictrum auemonoides March 24, 1878 



Dentaria laciniata March 24, 1878 



Antennaria plantaginifolia March 24, 1878 



Erodium ciciitariuin March 27, 1874 



Erigenia bulbosa March 28, 1875 



Cardaraine hirsuta March 30, 1879 



It is about the 1st of April, especially in early years, that the vege- 

 tation seems to receive its greatest impetus. This is well sbown by the 

 following list of species seen in flower during the first week in April: 



Ulmus Americana April 1 , 1873 



Jefl'ersonia diphylla April 2, 187C 



Cardamine rhomboidea April 2, 1876 



Stellaria pubera April 2, 1876 



Thaspium aureum AjDril 2, 1876 



Euphorbia commutata April 2, 1876 



Alnus serrulata April 3, 1881 



Kanunculus abortivus April 4, 1880 



Diceutra Cucullaria April 4, 1880 



Arabis laevigata Ajiril 4, 1880 



Viola tricolor, var. arvensis April 4, 1880 



Vicia Caroliniana April 4, 1880 



Amelanchier Canadensis April 4, 1880 



Nepeta Glechoma April 4, 1880 



Sassafras officinale April 4, 1880 



Carpinus Americana April 4, 1880 



Ostrya Virginica April 4, 1880 



Erythronium Americanum April 4, 1880 



Barbarea vulgaris April 5, 1874 



Pedicularis Canadensis April 5, 1874 



Mertensia Virginica April 5, 1874 



Eanunculus abortivus, var. micranthus April 7, 1878 



Eanunculus repens April 7, 1878 



Asimina triloba April 7, 1878 



Caulophyllum thalictroides April 7, 1878 



Arabis dentata April 7, 1878 



Barbarea prajcox April 7, 1874 



