INDEX 



283 



Sequoia gigantea, 244 



sempervircns, 245 

 Serai communities, 198-199 

 Sere, 201 



Sorotinal sc^asoii, 234 

 Service berry, 245 

 Shade leaves, 43 

 Sliade-m(>sophyte, 159 

 Shantz, H. L., 157, 168, 174, 250, 251, 



254 

 Shelford, Victor E., 13, 129 

 Shin leaf, 222 

 Shingle beach, 218 

 Shirley, H. L., 129 

 Short-dav plants, 120 

 Short-grass plains, 20. 250 

 Shreve, f]dith B., 166, 179 

 Shreve, Forrest, 137, 143, 179, 254 

 Shrubs, deciduous, 35 



leafless evergreen, 34 



sclerophyllous evergreen, 33 



tropical evergreen, 33 

 ShuU, G. H., 191 

 Sieve plates, 29 



tubes, 29 

 Silene acaulis, 142 

 Silphiiim laciniatitm, 127 

 Skene, McGregor, 72 

 Skipper, E. J., 179 

 Skullcap, 229 



Skunk cabbage, 84, 86, 169 

 Sleet, 161 

 Slope, 217 

 Slough grass, 226 

 Small, J., 88, 191 

 Smartweed, 184, 222, 229 

 Smilacina racemosa, 223, 233 



stellata, 223 

 Smilax herbacea, pollination of, 84 



tendrils of, 93 

 Smith, A. Loraine, 117 

 Smith, J. Warren, 261 

 Smoke, 138 

 Snow, 40, 155, 161 

 Snyder, E. F., 157 

 Soapwort family, 89 

 latex sacs in, 37 

 Socies, 198 

 Societies, 196-198 

 Sod-grasses, 178 

 Soil, 144-156 



acidity and alkalinity, 150-152 



aeration, 139 



classification, 146 



covers, 155-156 



floras and faunas, 149-150 



formation, 144-145 



humus, 149 



minerals, 148-149 



structure and texture, 145-146 



unstable, 153-155 



water, 146-148 



Solanum dulcamara, 91, 93 

 Solidago, 223, 227 

 Solomon's seal, 222, 223 

 Soredia, 115 

 Sorgaslrum, 248 

 Spanish moss, 94, 98 

 Spartina, 19 



michauxiana, 226 

 Sperry, Omer E., 53 

 Sperry, T. M., 26 

 Sphagnum, 175, 230 

 Spikenard, 233 

 Spinescence, 171 

 Spirodela, roots of, 24 

 Spirogyra, buoyancy of, 46 

 Spongophylls, 45 

 Spongy parenchyma, 41, 42, 43 

 Sporobolus, 249 

 Spratt, Ethel R., 117 

 Spring beauty, 232 



societv, 197 

 Spruce, 183, 243, 245 

 Spui-ges, 236 



African desert, 34 

 Squawbush, 154, 245 

 Starch in roots, 18 

 Starr, Anna M., 54 

 Staurophylls, 45 

 Steinberg, R. A., 129 

 Stem fall, 36 



form, variations in, 37 



habits, 33 



succulents, 176 

 Stems, 27 



as storage organs, 36 



of lianas, 89, 90 



succulent, 36 



underground, 22 

 Stewart, Alban, 117 

 Stewart, George, 219 

 Stipa, 249 



spartea, 257 

 Stoa, T. E., 219 

 Stober, J. P., 54 

 Stoddart, L. A., 179 

 Stomata, 41, 43, 45, 46-48, 167, 168, 



171 

 Strawberry, 143, 233 



runners of, 28 

 Striplands, 223 

 Stuart, W., 219 

 Studhalter, R. A., 191 

 Subdominant species, 196 

 Suberin, 33 

 Succession, 187-189, 203-218 



causes of, biotic, 207 

 continuing, 206-213 

 initial, 203-206 

 Successional series of communities, 200 

 Succulents, 36, 176, 178 



leaves of, 43, 52 

 Sulphur, 148 



