1918] 
Index 
INDEX TO VOLUME 20. 
New scientific names are printed in full face type. 
Acanthaceae, 68. 
Acer rubrum, 115. 
Achillea Ptarmica, 107. 
Aconitum Napellus, 182, 184. 
Actaea alba, 182, 185; rulra, 182, 
185, forma neglecta, 182. 
Additional Wool Waste Plants, 20. 
Afzelia, 68, 136. 
Agalineae, 67. 
Agalinis, 69, 70, 73, 133-137, 199, 200; 
auriculata, 71, 73; densiflora, 71, 
73; The Flower of, — A correction, 
199; glauca, 71, 73; grandi- 
flora, 70, 73, var. serrata, 70, 
73; heterophylla, 134; laevi- 
gata, 71, 73; linifolia, 134-136; 
pedicularia, 70, 73, var. am- 
bigens, 70, 73, var. caesariensis, 
70, 73, var. pectinata, 70, 73; 
peduncularis, 135; purpurea, 70; 
tenuifolia, var. macrophylla, 71, 
73; virginica, 71, 73. 
Agalinis subg. Euagalinis, 70, 73; 
subg. Otophylla, 70, 73; subg. 
Panctenis, 70, 73. 
Agrimonia, 15;  gryposepala, 15; 
mollis, 15; striata, 15. 
Agrostis alba aristata, 97. 
Alchemilla, 15; pratensis, 15; vul- 
garis, var. vestita, 15. 
Allen, C. E. [Notice of Work.], 160. 
Soperrnn geniculatus aristulatus, 
ki 
Amaranthus Powellii, 203, and Digi- 
taria lanata in New England, 203. 
Amelanchier, 16; laevis, 16; laevis 
X oblongifolia, 16; oblongifolia, 
16; oblongifolia X stolonifera, 16; 
sanguinea, 16; stolonifera, 16, 105, 
var. micropetala, 16. 
American Epilobiums of the Section 
Lysimachion, Some, 29; Range of 
Botrychium lanceolatum, 19; Rec- 
ord of Scirpus mucronatus, His- 
tory of the, 41; Representatives 
of Equisetum sylvaticum, 129; 
Variations of Epilobium, Section 
Chamaenerion, 1. 
211 
Ammania, 65. 
Ammophila, 105. 
Amorpha, 165; fruticosa, 165. 
Amphicarpa, 165; monoica, 165; 
Pitcher, 165. 
Anemone canadensis, 182, 194; cylin- 
drica, 182, 193; miultifida, var. 
hudsoniana, 182, 194; nemorosa, 
77, 184; parviflora, 182, 194, 195; 
quinquefolia, 182, 185; riparia, 
182, 194; virginiana, 182, 193. 
Anemonella thalictroides, 182, 193. 
Antennaria, 107; canadensis, 107. 
Anthemideae, 151. 
Apios, 165; tuberosa, 165. 
Aquilegia canadensis, 182, 193, var. 
flaviflora, 182, var. Phippenil, 182; 
vulgaris, J82, 184. 
Arabidopsis, 201, 202; novae-angliae, 
201-203; Thaliana, 202, 203. 
Arabis, 202; Collinsii, 96; Thaliana, 
202. 
Arachis hypogaea, 165. 
Arenaria peploides, 104, var. robusta, 
104. 
Asclepias Cornuti, 206, 207; grandi- 
flora, 206; syriaca, 206, A smooth- 
fruited Form of, 206, forma 
inermis, 207. 
Ashe, W. W., Notes on Betula, 63. 
Aspidium Goldianum, 119. 
Aster laurentianus, var. contiguus, 
102, 107; subulatus, var. obtusi- 
folius, 102, 107. 
Astragalus, 165; contortuplicatus, 
165; glycyphyllos, 165. 
Atriplex maritima, 104. 
Aureolaria, 69, 70, 134-137, 199; 
divaricata, 136; filicaulis, 136; 
grandiflora, 135; Greggii, 135; 
pectinata, 136; pedicularia, 136; 
pedicularia caesariensis, 70, 73; 
A Plea for, 133; tenuifolia, 136; 
virginica, 67. 
Aureolaria, subg. Panctenis, 70. 
Azalea, 54; calendulacea, 53; lutea, 
53, 54; nudiflora, 53, 54; pericly- 
menoides, 53, 54. 
