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Bulletin - United States National Museum - Smithsonian Institution

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FLORA OF WASHINGTON AND VICINITY. 29<br />

Salix tristis March 17, 1877<br />

Populus grandidentata March 21, 1880<br />

Corydalis flavula March 22, 1874<br />

Thalictrum auemonoides March 24, 1878<br />

Dentaria laciniata March 24, 1878<br />

Antennaria plantaginifolia March 24, 1878<br />

Erodium ciciitariuin March 27, 1874<br />

Erigenia bulbosa March 28, 1875<br />

Cardaraine hirsuta March 30, 1879<br />

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

tation seems to receive its greatest impetus. This is well sbown by the<br />

following list of species seen in flower during the first week in April:<br />

Ulmus Americana April 1 , 1873<br />

Jefl'ersonia diphylla April 2, 187C<br />

Cardamine rhomboidea April 2, 1876<br />

Stellaria pubera April 2, 1876<br />

Thaspium aureum AjDril 2, 1876<br />

Euphorbia commutata April 2, 1876<br />

Alnus serrulata April 3, 1881<br />

Kanunculus abortivus April 4, 1880<br />

Diceutra Cucullaria April 4, 1880<br />

Arabis laevigata Ajiril 4, 1880<br />

Viola tricolor, var. arvensis April 4, 1880<br />

Vicia Caroliniana April 4, 1880<br />

Amelanchier Canadensis April 4, 1880<br />

Nepeta Glechoma April 4, 1880<br />

Sassafras officinale April 4, 1880<br />

Carpinus Americana April 4, 1880<br />

Ostrya Virginica April 4, 1880<br />

Erythronium Americanum April 4, 1880<br />

Barbarea vulgaris April 5, 1874<br />

Pedicularis Canadensis April 5, 1874<br />

Mertensia Virginica April 5, 1874<br />

Eanunculus abortivus, var. micranthus April 7, 1878<br />

Eanunculus repens April 7, 1878<br />

Asimina triloba April 7, 1878<br />

Caulophyllum thalictroides April 7, 1878<br />

Arabis dentata April 7, 1878<br />

Barbarea prajcox April 7, 1874

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