FLORA OF WASHINGTON AND VICINITY. 31 



Ehus aromatica April 14, 1878 



Phlox subulata April 14, 1878 



Arabis patens April 18, 1880 



Cardamine liirsuta, var. sylvatica April 18, 1880 



Negundo aceroides April 18, 1880 



Erigeron bellidifolius April 18, 1880 



Krigia Virginica Ajiril 18, 1880 



Sisyrinchium anceps April 18, 1880 



Carex laxiflora April 18, 1880 



Carex Emmonsii April 18, 1880 



Melica mutica April 18, 1880 



Aueinone nemorosa April 19, 1874 



Viola cucullata, var. cordata Aj)ril 19, 1874 



Dirca palustris — April 19, 1874 



Carex Penusylvauica April 19, 1874 



Lathyrus veuosus April 21, 1878 



Kibes rotundifoliuni April 21, 1878 



Salix nigra, var. Wardi . . April 21, 1878 



We thus see that a single collector has, in the course of eight years^ 

 operations, actually observed and noted 11 species in bloom in Febru- 

 ary, 24 more in March, 51 additional in the first week of Ai)ril, and 26 

 others during the second and third weeks of April, or 112 up to April 21. 

 It should be remarked that there is no doubt tliat if the same locali- 

 ties in which the large number were observed on April 2, 187C, April 4, 

 1880, and April 7, 1878, had been visited in the last days of March of 

 those years, quite a number of these plants would have been found suf- 

 ficiently advanced to demand a place in the lists, and thus the month 

 of March would have been credited with so many here set down for the 

 first week in April. Probably, all things considered, not less than 50 

 species in certain favored seasons either reach or pass by their flower- 

 ing time by the end of March. 



In arranging the above lists the order of dates has, of course, taken 

 precedence, but where se\'eral are enumerated under one date the natural 

 order is followed. 



It is scarcely necessary to suggest a caution to collectors against rely- 

 ing upon these dates in making collections. They represent the earliest 

 observations and not the average. In most cases an allowance of at 

 least one week should be made for the full blooming of all the individu- 

 als of any given species. In all cases, however, one or more individuals 



