1917] 
Some color Forms of American 
Anemones, 139; Forms of Ameri- 
can Gentians, 149; further Plants 
found on Woolwaste at Westford, 
Massachusetts, 132; new or criti- 
cal Plants of eastern North Amer- 
ica, 152; Polygonums new to 
North America, 133; Traits of 
Epipactis in Vermont, 38. 
Sonchus arvensis, 253. 
Sorghastrum nutans, 164. 
Sparganium americanum, 107; luci- 
dum, 107. 
Spartina alterniflora, var. glabra, 27; 
Michauxiana, 119; new to New 
England, A Variety of, 27. 
Species, Gentiana clausa, a valid, 
147; of Alopecurus, Remarks on 
several North American, 165; of 
Lathyrus, Studies in certain North 
American, 156; or Varieties of 
Ranunculus, New or critical, 135; 
Varieties and Forms of Saxifraga, 
New, 141. 
Specific Characters of Hepatica amer- 
icana, 45. 
Spergularia canadensis, 129; 
sperma, 129; salina, 129. 
Sphaeralcea remota, 62. 
Sphenolobus, 263; ascendens, 263; 
exsectaeformis, 272. 
Spinacia oleracea, 129. 
Spinach, 129. 
Spiraea latifolia, 254, 255, A boreal 
and subalpine Variety of, 254, lati- 
folia, var. septentrionalis, 255, 
var. typica, 255; prunifolia, 226; 
salicifolia, y latifolia, 255. 
Spiranthes, 57; Beckii X gracilis, 
127; cernua, 57, var. ochroleuca, 
57; gracile, 57; lucida, 30, 127; 
Romanzoffiana, 57. 
Sporobolus heterolepis, 164; neg- 
lectus, 110; uniflorus, 97, 110. 
Statice, 1-3; andina, 5; arctica, 6, 
8, var. californica, 6, 8, 9, var. 
genuina, 6,9; Armeria, 1, 3, 6, 9; 
in North Americana, 1; labra- 
dorica, 6, 9, var. genuina, 6, 8, 
var. submutica, 6, 7, var. sub- 
mutica, forma glabriscapa, 6-8, 
var. submutica, forma pubiscapa, 
6, 7; maritima, 7. 
Status of Glyceria Fernaldii, 75. 
Steironema lanceolatum, 246. 
Stellaria aquatica, 130; borealis, var. 
floribunda, 130, var. isophylla, 130; 
graminea, var. latifolia, 130; me- 
dia, 220. 
leio- 
Index 
287 
Stenophyllus capillaris, 153, 154, 
var. cryptostachys, 154. 
Streptopus roseus, 127. 
Struthiopteris, 197. 
Studies in certain North American 
Species of Lathyrus, 156; in North 
American Ferns, Taxonomic and 
geographic, 169. 
Symphytum asperrimum, 247; as- 
perum, 247. 
Symplocarpus foetidus, 219. 
Taenidia integerrima, 245. 
Taraxacum, 111, 221; ceratophorum, 
112, 221, in New England, 111; 
erythrospermum, 220; officinale, 
220. 
Tardy Flowering of Plants in eastern 
Massachusetts in the Spring of 
1917, 219. 
Taxonomic and geographic Studies in 
North American Ferns, 169. 
Thalictrum dasycarpum, 224. 
Thaspium aureum, 67, 164. 
Tiarella cordifolia, 132, 226, forma 
parviflora, 132. 
Tillaea aquatica, 91, 218, 219; 
Vaillantii, 219. 
Tofieldia glutinosa, 164. 
Tortella caespitosa, 69. 
Tradescantia reflexa, 126; virginica, 
var. villosa, 66. 
Trifolium dubium, 228. 
Triglochin maritima, 32, 35; palus- 
tris, 31, 33, 35. 
Tropaeolum majus, 115. 
Tsuga canadensis albo-spica, 273. 
Tussilago, 220. 
Two new maritime Plants of north- 
eastern North America, 76; new 
Polygonums from New England, 
232. 
Ulmus americana, 220. 
United States and Canada, Andro- 
pogon scoparius in the, 100. 
Utricularia, 38; clandestina, 248; 
fibrosa, 38, in Massachusetts, 38; 
intermedia, 32; resupinata, 248. 
Uvularia grandiflora, 127. 
Vaccinium corymbosum, var. palli- 
dum, 246; stamineum, 246; vacil- 
lans, 66, var. crinitum, 246. 
Valeriana, 33; uliginosa, 31, 33, 53. 
Variations of Polygonum pensyl- 
vanicum, 70. 
Varieties and Forms of Saxifraga, 
New Species, 141; Botrychium 
