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30 FLORA OF WASHINGTON AND VICINITY. Sisymbrium Alliaria April 7, 1878 Viola cucullata April 7, 1878 Viola striata April 7, 1878 Viola glabella April 7, 1878 louidium concolor April 7, 1878 Sileue Pennsylvanica April 7, 1878 Cerastium valgatum Ajiril 7, 1878 Cerastium oblougifolium April 7, 1878 Geranium maculatum April 7, 1878 Oxalis corniculata var. stricta Ajiril 7, 1878 Cercis Canadensis Aj^ril 7, 1878 Poteutilla Canadensis Ai^ril 7, 1878 Thaspium trifoliatum April 7, 1878 Cornus florida April 7, 1878 Chrysogonum Virginianum April 7, 1878 Senecio aureus April 7, 1878 Fraxiuus viridis April 7, 1878 Phlox divaricata April 7, 1878 Lithospermum arvense April 7, 1878 Betula nigra April 7, 1878 Populus monilifera April 7, 1878 Arissema tripbyllum April 7, 1878 Erytbronium albidum April 7, 1878 Trillium sessile— April 7, 1878 My special observations 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 gTeat number of plants in bloom, including the amentaceous trees, render it diflicult to i)ursue 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 previously enumerated, are as follows : Arabis lyrata Aj)ril 9, 1876 Fraxinus pubescens April 11, 1880 Salix cordata April 11, 1880 Salix i)urpurea April 11, 1880 Vaccinium corymbosum April 12, 1874 Carex platyphylla April 12, 1874 Poa annua April 12, 1874 Thalictrum dioicum April 14, 1876
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 flowering 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 individuals of any given species. In all cases, however, one or more individuals
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Page 15 and 16: I. INTRODUCTORY REMARKS. This monog
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1. Clematis ochroleuca, Ait. 2. Cle
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150 43. Dicentra Cucullaria, DC. '4
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154 138. Sida spinosa, L. 139. Abut
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Iii4 FLORA OF WASHINGTON AND VICINI
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16fi 424. Solidago gigantea, Ait. 4
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j.68 FLORA OF WASHINGTON AND VICINI
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1.74 FLORA OF WASHINGTON AND VICINI
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17G FLORA OF WASHINGTON AND VICINIT
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186 894. Sagittaria variabilis, Eng
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1^4 FLORA. OF WASHINGTON AND VICINI
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IDO FLOEA OF WASHINGTON AND VICINIT
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202 FLORA OF WASHmGTON AND VICINITY
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^I^FEISTDIX:. SUGGESTIONS TO BEGINN
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FLORA OF WASHINGTON AND VICINITY. 2
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flora of washington and vicinity. 2
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\ FLOEA or WASHINGTON AND VICINITY.
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INDEX [Species are not indexed exce
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Balm 105 of Gilead 117 Balmony 101
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INDEX. 243 Page. Carex polyraorpha
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Coreopsis discoidea rosea verticill
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INDEX. 247 Page. Eleocharis paliist
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INDEX. 249 Page. Goldie's "Wood-Fem
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Introduced species, Number of, from
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INDEX. 253. Page. Magnolia Family 6
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INDEX. 255 Pago. Orchis FamDy 119 O
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INDEX. Page. Population in 1830 and
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INDEX 259 Page. Saltwort 107 Salvia
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INDEX. 261 Page. Staghorn Sumac 73
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Viburnum dentatum 49 nudum 49 pruni
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