
          Calendarium Florae for 1820
# late. + early. ≠ not the first

24 Mar 1820 / Pothos foetidusa + [early] / 
28 Mar 1820 / Alnus serrulata /
28 Mar 1820 / Stellaria media /
01 Apr 1820 / Hepatica triloba /
01 Apr 1820 / Veronica hederiafolia ≠ [not the first] /
01 Apr 1820 / Ulmus aspera / 
01 Apr 1820 / Laurus benzoin  ≠ [not the first] /
06 Apr 1820 / Thlaspi bursa pastoris /
06 Apr 1820 / Salix eriocephala /
06 Apr 1820 / Saxifraga virginiensis /
13 Apr 1820 / Corydalis cucullaria + [early] / in market
13 Apr 1820 / Caltha palustris  + [early] / Sanguinaria in gardens
13 Apr 1820 / Populus tremuloides / 
15 Apr 1820 / Populus angulata / first [?]
18 Apr 1820 / Claytonia virginica / Hoboken
18 Apr 1820 / Anemone thalictroides / "
18 Apr 1820 / Viola pedata  
18 Apr 1820 / Populus (cotton tree In full flower in the street) /
18 Apr 1820 / Gnaphalium plantagineum / 
18 Apr 1820 / Prunus cerasus (23rd in full bloom, 25 first fell) /
18 Apr 1820 / Amygdalus persica /
18 Apr 1820 / Ribes rubrum & floridanum / Gardens
18 Apr 1820 / Aronia botryapium / Robertson's Creek
18 Apr 1820 / Viola pedata / 
        